feat: introduce task cancelling

.gitea/workflows/build_and_test.yml

@@ -15,7 +15,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: '24'
+          java-version: '23'
           cache: 'maven'
       - name: Compile project
         run: |

independentTest.sh

@@ -10,7 +10,6 @@ mkdir $TDIR
 cd $TDIR
 git clone $REPO .
 git checkout feat/unify-server
-# git checkout 93e1a8787cd94c73f4538f6a348f58613893a584
 # git checkout dad468368b86bdd5a3d3b2754b17617cee0a9107 # 1:55
 # git checkout a0c11b60e8c9d7addcbe0d3a09c9ce2924e9d5c0 # 2:25
 # git checkout 4cddf73e6d6c9116d3e1705c4b27a8e7f18d80c3 # 2:27
@@ -20,14 +19,15 @@ git checkout feat/unify-server
 # git checkout 1391206dfe59263cdb22f93371cfd1dd5465d97f # 1:29
 
 date "+%Y.%m.%d %H:%M:%S"
-# sed -i -e 's/source>21/source>23/g' pom.xml
+
-# sed -i -e 's/target>21/target>23/g' pom.xml
+# mvn clean compile -DskipTests package
+## prefix each stderr line with " | "
+# exec 2> >(trap "" INT TERM; sed 's/^/ | /' >&2)
+# echo -e "\nMatrix test:\n |"
+# time java -jar target/JavaTXcompiler-0.1-jar-with-dependencies.jar resources/bytecode/javFiles/Matrix.jav >/dev/null;
 
 
-mvn clean compile -DskipTests package
+mvn clean compile test
-time java -jar target/JavaTXcompiler-0.1-jar-with-dependencies.jar resources/bytecode/javFiles/Matrix.jav;
-
-# mvn clean compile test
 
 
 echo -e "\nCleanup... "

pom.xml

@@ -12,37 +12,37 @@ http://maven.apache.org/maven-v4_0_0.xsd">
 	<url>http://maven.apache.org</url>
 	<dependencies>
 		<dependency>
-			<groupId>org.junit.jupiter</groupId>
+			<groupId>junit</groupId>
-			<artifactId>junit-jupiter-api</artifactId>
+			<artifactId>junit</artifactId>
-			<version>5.13.2</version>
+			<version>4.13.2</version>
 			<scope>test</scope>
 		</dependency>
 		<!-- https://mvnrepository.com/artifact/org.antlr/antlr4 -->
 		<dependency>
 			<groupId>org.antlr</groupId>
 			<artifactId>antlr4</artifactId>
-			<version>4.13.2</version>
+			<version>4.11.1</version>
 		</dependency>
 		<dependency>
 			<groupId>commons-io</groupId>
 			<artifactId>commons-io</artifactId>
-			<version>2.19.0</version>
+			<version>2.16.1</version>
 		</dependency>
 		<dependency>
 			<groupId>io.github.classgraph</groupId>
 			<artifactId>classgraph</artifactId>
-			<version>4.8.180</version>
+			<version>4.8.172</version>
 		</dependency>
 		<dependency>
 			<groupId>com.google.guava</groupId>
 			<artifactId>guava</artifactId>
-			<version>33.4.8-jre</version>
+			<version>33.2.0-jre</version>
 		</dependency>
 		<!-- https://mvnrepository.com/artifact/org.ow2.asm/asm -->
 		<dependency>
 			<groupId>org.ow2.asm</groupId>
 			<artifactId>asm</artifactId>
-			<version>9.8</version>
+			<version>9.5</version>
 		</dependency>
 		<dependency>
 			<groupId>org.java-websocket</groupId>
@@ -59,11 +59,6 @@ http://maven.apache.org/maven-v4_0_0.xsd">
 			<artifactId>jackson-databind</artifactId>
 			<version>2.17.2</version>
 		</dependency>
-		<dependency>
-			<groupId>com.diogonunes</groupId>
-			<artifactId>JColor</artifactId>
-			<version>5.5.1</version>
-		</dependency>
 	</dependencies>
 
 	<build>
@@ -71,17 +66,17 @@ http://maven.apache.org/maven-v4_0_0.xsd">
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
-				<version>3.14.0</version>
+				<version>3.11.0</version>
 				<configuration>
 					<compilerArgs>--enable-preview</compilerArgs>
-                    <source>24</source>
+                    <source>23</source>
-                    <target>24</target>
+                    <target>23</target>
                 </configuration>
 			</plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-surefire-plugin</artifactId>
-				<version>3.5.3</version>
+				<version>3.1.0</version>
 				<configuration>
 					<redirectTestOutputToFile>true</redirectTestOutputToFile>
 					<reportsDirectory>${project.build.directory}/test-reports</reportsDirectory>
@@ -97,7 +92,7 @@ http://maven.apache.org/maven-v4_0_0.xsd">
 			<plugin>
 				<groupId>org.antlr</groupId>
 				<artifactId>antlr4-maven-plugin</artifactId>
-				<version>4.13.2</version>
+				<version>4.11.1</version>
 				<executions>
 					<execution>
 						<id>antlr</id>
@@ -110,7 +105,7 @@ http://maven.apache.org/maven-v4_0_0.xsd">
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-jar-plugin</artifactId>
-				<version>3.4.2</version>
+				<version>3.3.0</version>
 				<configuration>
 					<archive>
 						<manifest>
@@ -158,4 +153,4 @@ http://maven.apache.org/maven-v4_0_0.xsd">
 			<url>file:///${project.basedir}/maven-repository/</url>
 		</repository>
 	</distributionManagement>
-</project>
+</project>

resources/bytecode/javFiles/Bug325.jav

@@ -6,7 +6,7 @@ import java.util.stream.Stream;
 
 public class Bug325 {
     public main() {
-      var list = new ArrayList<>(List.of(1,2,3,4,5));
+      List<Integer> list = new ArrayList<>(List.of(1,2,3,4,5));
       var func = x -> x*2;
       return list.stream().map(func).toList();
    }

resources/bytecode/javFiles/Bug363.jav

@@ -1,22 +0,0 @@
-import java.lang.String;
-
-
-public class Bug363 {
-  uncurry (f){
-    return x -> f.apply(x);
-  }
-
-  uncurry (f){
-    return (x, y) -> f.apply(x).apply(y);
-  }
-
-  uncurry (f){
-    return (x, y, z) -> f.apply(x).apply(y).apply(z);
-  }
-
-  public test(){
-    var f = x -> y -> z -> x + y + z;
-    var g = uncurry(f);
-    return g.apply("A", "B", "C"); // Outputs: 6
-  }
-}

resources/bytecode/javFiles/Bug364.jav

@@ -1,8 +0,0 @@
-import java.lang.String;
-
-public class Bug364{
-  public main(){
-    var f = x -> y -> z -> x + y + z;
-    return f.apply("A").apply("B").apply("C");
-  }
-}

resources/bytecode/javFiles/Bug365.jav

@@ -1,21 +0,0 @@
-import java.lang.String;
-import java.lang.Object;
-
-public class Bug365{
-  swap(f){
-    return x -> y -> f.apply(y).apply(x);
-  }
-
-  swap(Fun1$$<String, Fun1$$<String, Fun1$$<String, Object>>> f){
-    return x -> y -> z -> f.apply(z).apply(y).apply(x);
-  }
-
-  public ex1() {
-    var func = x -> y -> z -> x + y + z;
-    return func.apply("A").apply("B").apply("C");
-  }
-  public ex2() {
-    var func = x -> y -> z -> x + y + z;
-    return swap(func).apply("A").apply("B").apply("C");
-  }
-}

resources/bytecode/javFiles/Bug366.jav

@@ -1,12 +0,0 @@
-import java.lang.Integer;
-
-public class Bug366 {
-    public static lambda() {
-        return (a, b) -> a + b;
-    }
-
-    public static test() {
-        var l = lambda();
-        return l.apply(10, 20);
-    }
-}

resources/bytecode/javFiles/Bug371.jav

@@ -1,10 +0,0 @@
-import java.lang.Boolean;
-
-public class Bug371 {
-    static m1(x, y) { return x || y; }
-    static m2(x, y) { return x && y; }
-
-    public static test() {
-        return m2(m1(true, false), true);
-    }
-}

resources/bytecode/javFiles/Bug373.jav

@@ -1,17 +0,0 @@
-import java.lang.Boolean;
-import java.lang.Integer;
-import java.lang.System;
-import java.io.PrintStream;
-import java.lang.Character;
-
-public class Bug373 {
-    public static main() {
-        System.out.println(true);
-        System.out.println(false);
-        System.out.println(1);
-        System.out.println(1l);
-        System.out.println(1.0);
-        System.out.println(1.0f);
-        System.out.println('a');
-    }
-}

resources/bytecode/javFiles/BugXXX.jav

@@ -0,0 +1,16 @@
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import java.lang.String;
+import java.util.stream.Stream;
+import java.util.function.Function;
+import java.util.function.Predicate;
+import java.lang.Integer;
+
+class BugXXX {
+    public main() {
+        List<Integer> i = new ArrayList<>(List.of(1,2,3,4,5,6,7,8,9,10));
+        Optional<Integer> tmp = i.stream().filter(x -> x == 5).map(x -> x*2).findFirst();
+        return tmp;
+    }
+}

resources/bytecode/javFiles/Main.jav

@@ -1,14 +0,0 @@
-import java.lang.Object;
-import java.lang.System;
-import java.lang.Iterable;
-import java.io.PrintStream;
-import java.util.List;
-import java.lang.String;
-
-class Main {
-    static main(args) {
-        for (var arg : args) {
-            System.out.println(arg);
-        }
-    }
-}

src/main/java/de/dhbwstuttgart/bytecode/Codegen.java

@@ -8,21 +8,17 @@ import de.dhbwstuttgart.target.generate.ASTToTargetAST;
 import de.dhbwstuttgart.target.tree.*;
 import de.dhbwstuttgart.target.tree.expression.*;
 import de.dhbwstuttgart.target.tree.type.*;
-import de.dhbwstuttgart.util.Logger;
 import org.objectweb.asm.*;
 
 import java.lang.invoke.*;
 import java.lang.reflect.Modifier;
 import java.util.*;
-import java.util.stream.Collectors;
 
 import static org.objectweb.asm.Opcodes.*;
 import static de.dhbwstuttgart.target.tree.expression.TargetBinaryOp.*;
 import static de.dhbwstuttgart.target.tree.expression.TargetLiteral.*;
 
 public class Codegen {
-    public static Logger logger = new Logger("codegen");
-
     private final TargetStructure clazz;
     private final ClassWriter cw;
     public final String className;
@@ -88,16 +84,14 @@ public class Codegen {
         int localCounter;
         MethodVisitor mv;
         TargetType returnType;
-        boolean isStatic = false;
 
         Stack<BreakEnv> breakStack = new Stack<>();
         Stack<Integer> switchResultValue = new Stack<>();
 
-        State(TargetType returnType, MethodVisitor mv, int localCounter, boolean isStatic) {
+        State(TargetType returnType, MethodVisitor mv, int localCounter) {
             this.returnType = returnType;
             this.mv = mv;
             this.localCounter = localCounter;
-            this.isStatic = isStatic;
         }
 
         void enterScope() {
@@ -235,9 +229,9 @@ public class Codegen {
         if (source.equals(dest))
             return;
         if (source.equals(TargetType.Long)) {
-            if (dest.equals(TargetType.Integer))
+            if (dest.equals(TargetType.Integer)) {
                 mv.visitInsn(L2I);
-            else if (dest.equals(TargetType.Float))
+            } else if (dest.equals(TargetType.Float))
                 mv.visitInsn(L2F);
             else if (dest.equals(TargetType.Double))
                 mv.visitInsn(L2D);
@@ -280,8 +274,6 @@ public class Codegen {
                 mv.visitInsn(I2F);
             else if (dest.equals(TargetType.Double))
                 mv.visitInsn(I2D);
-        } else if (source.equals(TargetType.Boolean)) {
-            unboxPrimitive(state, dest);
         } else if (isFunctionalInterface(source) && isFunctionalInterface(dest) &&
                 !(source instanceof TargetFunNType && dest instanceof TargetFunNType)) {
             boxFunctionalInterface(state, source, dest);
@@ -765,16 +757,6 @@ public class Codegen {
         }
     }
 
-    private static TargetType removeGenerics(TargetType param) {
-        return switch (param) {
-            case null -> null;
-            case TargetFunNType funNType -> new TargetFunNType(funNType.name(), funNType.funNParams(), List.of(), funNType.returnArguments());
-            case TargetRefType refType -> new TargetRefType(refType.name());
-            case TargetGenericType targetGenericType -> TargetType.Object;
-            default -> param;
-        };
-    }
-
     private void generateLambdaExpression(State state, TargetLambdaExpression lambda) {
         var mv = state.mv;
 
@@ -786,8 +768,7 @@ public class Codegen {
 
         var parameters = new ArrayList<>(lambda.captures());
         parameters.addAll(signature.parameters());
-        parameters = parameters.stream().map(param -> param.withType(removeGenerics(param.pattern().type()))).collect(Collectors.toCollection(ArrayList::new));
+        var implSignature = new TargetMethod.Signature(Set.of(), parameters, lambda.signature().returnType());
-        var implSignature = new TargetMethod.Signature(Set.of(), parameters, removeGenerics(lambda.signature().returnType()));
 
         TargetMethod impl;
         if (lambdas.containsKey(lambda)) {
@@ -795,22 +776,21 @@ public class Codegen {
         } else {
             var name = "lambda$" + lambdaCounter++;
 
-            impl = new TargetMethod(state.isStatic ? ACC_STATIC : 0, name, lambda.block(), implSignature, null);
+            impl = new TargetMethod(0, name, lambda.block(), implSignature, null);
-            generateMethod(impl, state);
+            generateMethod(impl);
             lambdas.put(lambda, impl);
         }
 
         var mt = MethodType.methodType(CallSite.class, MethodHandles.Lookup.class, String.class, MethodType.class, MethodType.class, MethodHandle.class, MethodType.class);
 
         var bootstrap = new Handle(H_INVOKESTATIC, "java/lang/invoke/LambdaMetafactory", "metafactory", mt.toMethodDescriptorString(), false);
-        var handle = new Handle(state.isStatic ? H_INVOKESTATIC : H_INVOKEVIRTUAL, clazz.getName(), impl.name(), implSignature.getDescriptor(), false);
+        var handle = new Handle(H_INVOKEVIRTUAL, clazz.getName(), impl.name(), implSignature.getDescriptor(), false);
 
         var params = new ArrayList<TargetType>();
-        if(!state.isStatic) params.add(new TargetRefType(clazz.qualifiedName().getClassName()));
+        params.add(new TargetRefType(clazz.qualifiedName().getClassName()));
         params.addAll(lambda.captures().stream().map(mp -> mp.pattern().type()).toList());
 
-        if (!state.isStatic)
+        mv.visitVarInsn(ALOAD, 0);
-            mv.visitVarInsn(ALOAD, 0);
         for (var index = 0; index < lambda.captures().size(); index++) {
             var capture = lambda.captures().get(index);
             var pattern = (TargetTypePattern) capture.pattern();
@@ -1337,7 +1317,7 @@ public class Codegen {
                 types.add(Type.getObjectType(guard.inner().type().getInternalName()));
                 // TODO Same here we need to evaluate constant;
             } else {
-                logger.info(label);
+                System.out.println(label);
                 throw new NotImplementedException();
             }
         }
@@ -1538,7 +1518,7 @@ public class Codegen {
         MethodVisitor mv = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "<clinit>", "()V", null, null);
         mv.visitCode();
 
-        var state = new State(null, mv, 0, true);
+        var state = new State(null, mv, 0);
         generate(state, constructor.block());
 
         mv.visitInsn(RETURN);
@@ -1552,7 +1532,7 @@ public class Codegen {
             mv.visitAttribute(new JavaTXSignatureAttribute(constructor.getTXSignature()));
         
         mv.visitCode();
-        var state = new State(null, mv, 1, false);
+        var state = new State(null, mv, 1);
         for (var param : constructor.parameters()) {
             var pattern = param.pattern();
             if (pattern instanceof TargetTypePattern tp)
@@ -1598,31 +1578,9 @@ public class Codegen {
             }
         }
     }
+
     private void generateMethod(TargetMethod method) {
-        generateMethod(method, null);
-    }
-
-    private void generateMainMethod() {
-        var mv = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "main", "([Ljava/lang/String;)V", null, null);
-        mv.visitCode();
-        mv.visitVarInsn(ALOAD, 0);
-        mv.visitMethodInsn(INVOKESTATIC, "java/util/List", "of", "([Ljava/lang/Object;)Ljava/util/List;", true);
-        mv.visitMethodInsn(INVOKESTATIC, className, "main", "(Ljava/util/List;)V", false);
-        mv.visitInsn(RETURN);
-        mv.visitMaxs(0, 0);
-        mv.visitEnd();
-    }
-
-    private void generateMethod(TargetMethod method, State parent) {
         var access = method.access();
-
-        var params = method.signature().parameters();
-        if (method.name().equals("main") && method.isStatic() && params.size() == 1 &&
-            params.getFirst().pattern().type().equals(new TargetRefType("java.util.List", List.of(new TargetRefType("java.lang.String"))))) {
-
-            generateMainMethod();
-        }
-
         if (method.block() == null)
             access |= ACC_ABSTRACT;
         if (clazz instanceof TargetInterface)
@@ -1636,10 +1594,7 @@ public class Codegen {
 
         if (method.block() != null) {
             mv.visitCode();
-            var state = new State(method.signature().returnType(), mv, method.isStatic() ? 0 : 1, method.isStatic());
+            var state = new State(method.signature().returnType(), mv, method.isStatic() ? 0 : 1);
-            if (parent != null) {
-                state.scope.parent = parent.scope;
-            }
             var offset = 1;
             for (var param : method.signature().parameters()) {
                 state.createVariable(param.pattern().name(), param.pattern().type());
@@ -1649,8 +1604,6 @@ public class Codegen {
                     bindLocalVariables(state, cp, offset);
                 offset++;
             }
-            //if (parent != null) System.out.println("parent: " + parent.scope.locals.keySet());
-            //System.out.println(state.scope.locals.keySet());
             generate(state, method.block());
             if (method.signature().returnType() == null)
                 mv.visitInsn(RETURN);
@@ -1757,7 +1710,7 @@ public class Codegen {
 
             // Generate wrapper method
             var mv = cw2.visitMethod(ACC_PUBLIC, toMethod.name, toDescriptor, null, null);
-            var state = new State(null, mv, 0, false);
+            var state = new State(null, mv, 0);
 
             mv.visitVarInsn(ALOAD, 0);
             mv.visitFieldInsn(GETFIELD, className, "wrapped", pair.from.toDescriptor());
@@ -1789,7 +1742,7 @@ public class Codegen {
                 converter.classLoader.findClass(className);
             } catch (ClassNotFoundException e) {
                 try {
-                    converter.classLoader.loadClass(className, bytes);
+                    converter.classLoader.loadClass(bytes);
                 } catch (LinkageError ignored) {}
             }
         }

src/main/java/de/dhbwstuttgart/bytecode/FunNGenerator.java

@@ -39,10 +39,6 @@ public class FunNGenerator {
         public final List<TargetType> inParams;
         public final List<TargetType> realParams;
 
-        public GenericParameters(TargetFunNType funNType) {
-            this(funNType.funNParams(), funNType.returnArguments());
-        }
-
         public GenericParameters(List<TargetType> params, int numReturns) {
             this.realParams = params;
             this.inParams = flattenTypeParams(params);
@@ -124,7 +120,7 @@ public class FunNGenerator {
             superFunNMethodDescriptor.append(")V");
         }
 
-        Codegen.logger.info(superFunNMethodSignature);
+        System.out.println(superFunNMethodSignature);
 
         ClassWriter classWriter = new ClassWriter(0);
         MethodVisitor methodVisitor;

src/main/java/de/dhbwstuttgart/core/ConsoleInterface.java

@@ -1,19 +1,13 @@
 package de.dhbwstuttgart.core;
 
-import de.dhbwstuttgart.server.SocketClient;
-import de.dhbwstuttgart.util.Logger;
 import java.io.File;
 import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
 import java.util.*;
 
 public class ConsoleInterface {
-
+  private static final String directory = System.getProperty("user.dir");
-  /**
-   * Leave the argument configurations here for the rest of the code to read
-   */
-  public static Logger.LogLevel logLevel = Logger.LogLevel.ERROR;
-  public static boolean writeLogFiles = false;
-  public static Optional<String> unifyServerUrl = Optional.empty();
 
   public static void main(String[] args) throws IOException, ClassNotFoundException {
     List<File> input = new ArrayList<>();
@@ -21,6 +15,7 @@ public class ConsoleInterface {
     String outputPath = null;
     Iterator<String> it = Arrays.asList(args).iterator();
     Optional<Integer> serverPort = Optional.empty();
+    Optional<String> unifyServer = Optional.empty();
 
     if (args.length == 0) {
       System.out.println("No input files given. Get help with --help");
@@ -30,9 +25,7 @@ public class ConsoleInterface {
         "\t-cp\tSet Classpath\n" +
         "\t-d\tSet destination directory\n" +
         "\t[--server-mode <port>]\n" +
-        "\t[--unify-server <url>]\n" +
+        "\t[--unify-server <url>]\n");
-        "\t[--write-logs]\n" +
-        "\t[-v|-vv-|-vvv]");
       System.exit(1);
     }
     while (it.hasNext()) {
@@ -49,31 +42,22 @@ public class ConsoleInterface {
       } else if (arg.equals("--server-mode")) {
         serverPort = Optional.of(Integer.parseInt(it.next()));
       } else if (arg.equals("--unify-server")) {
-        unifyServerUrl = Optional.of(it.next());
+        unifyServer = Optional.of(it.next());
-      } else if (arg.equals("--write-logs")) {
-        ConsoleInterface.writeLogFiles = true;
-      } else if (arg.startsWith("-v")) {
-        logLevel = switch (arg) {
-          case "-v" -> Logger.LogLevel.WARNING;
-          case "-vv" -> Logger.LogLevel.INFO;
-          case "-vvv" -> Logger.LogLevel.DEBUG;
-          default -> throw new IllegalArgumentException("Argument " + arg + " is not a valid verbosity level");
-        };
       } else {
         input.add(new File(arg));
       }
     }
 
     if (serverPort.isPresent()) {
-      if (unifyServerUrl.isPresent()) throw new RuntimeException("Cannot use unifyServer when in server mode!");
+      if (unifyServer.isPresent()) throw new RuntimeException("Cannot use unifyServer when in server mode!");
+
       JavaTXServer server = new JavaTXServer(serverPort.get());
       server.listen();
     }
     else {
-      JavaTXCompiler compiler = new JavaTXCompiler(input, classpath, outputPath != null ? new File(outputPath) : null);
+      JavaTXCompiler compiler = new JavaTXCompiler(input, classpath, outputPath != null ? new File(outputPath) : null, unifyServer);
       //compiler.typeInference();
       compiler.generateBytecode();
-      SocketClient.closeIfOpen();
     }
   }
 

src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java

@@ -13,10 +13,6 @@ import de.dhbwstuttgart.parser.antlr.Java17Parser.SourceFileContext;
 import de.dhbwstuttgart.parser.scope.JavaClassName;
 import de.dhbwstuttgart.parser.scope.JavaClassRegistry;
 import de.dhbwstuttgart.server.SocketClient;
-import de.dhbwstuttgart.server.SocketFuture;
-import de.dhbwstuttgart.server.packet.SetAutoclosePacket;
-import de.dhbwstuttgart.server.packet.UnifyRequestPacket;
-import de.dhbwstuttgart.server.packet.UnifyResultPacket;
 import de.dhbwstuttgart.syntaxtree.ClassOrInterface;
 import de.dhbwstuttgart.syntaxtree.GenericTypeVar;
 import de.dhbwstuttgart.syntaxtree.Method;
@@ -57,7 +53,6 @@ import de.dhbwstuttgart.typeinference.unify.UnifyResultListenerImpl;
 import de.dhbwstuttgart.typeinference.unify.UnifyResultModel;
 import de.dhbwstuttgart.typeinference.unify.UnifyTaskModel;
 
-import de.dhbwstuttgart.util.Logger;
 import java.io.*;
 import java.lang.reflect.Modifier;
 import java.nio.file.Path;
@@ -72,35 +67,47 @@ public class JavaTXCompiler {
 
 	// do not use this in any code, that can be executed serverside!
 	public static PlaceholderRegistry defaultClientPlaceholderRegistry = new PlaceholderRegistry();
-	public static Logger defaultLogger = new Logger();
 
 	// public static JavaTXCompiler INSTANCE;
 	final CompilationEnvironment environment;
 	Boolean resultmodel = true;
 	public final Map<File, SourceFile> sourceFiles = new HashMap<>();
 
+	Boolean log = false; //gibt an ob ein Log-File nach System.getProperty("user.dir")+""/logFiles/"" geschrieben werden soll?
 	public volatile UnifyTaskModel usedTasks = new UnifyTaskModel();
 	public final DirectoryClassLoader classLoader;
 
 	public final List<File> classPath;
 	private final File outputPath;
 
+	private final Optional<String> unifyServer;
+
 	public DirectoryClassLoader getClassLoader() {
 		return classLoader;
 	}
 
 	public JavaTXCompiler(File sourceFile) throws IOException, ClassNotFoundException {
-		this(Collections.singletonList(sourceFile), List.of(), new File("."));
+		this(Arrays.asList(sourceFile), List.of(), new File("."), Optional.empty());
+	}
+
+	public JavaTXCompiler(File sourceFile, Boolean log) throws IOException, ClassNotFoundException {
+		this(sourceFile);
+		this.log = log;
 	}
 
 	public JavaTXCompiler(List<File> sourceFiles) throws IOException, ClassNotFoundException {
-		this(sourceFiles, List.of(), new File("."));
+		this(sourceFiles, List.of(), new File("."), Optional.empty());
 	}
 
 	public JavaTXCompiler(List<File> sources, List<File> contextPath, File outputPath) throws IOException, ClassNotFoundException {
+		this(sources, contextPath, outputPath, Optional.empty());
+	}
+
+	public JavaTXCompiler(List<File> sources, List<File> contextPath, File outputPath, Optional<String> unifyServer) throws IOException, ClassNotFoundException {
 		// ensure new default placeholder registry for tests
 		defaultClientPlaceholderRegistry = new PlaceholderRegistry();
 
+		this.unifyServer = unifyServer;
 		var path = new ArrayList<>(contextPath);
 		if (contextPath.isEmpty()) {
 			// When no contextPaths are given, the working directory is the sources root
@@ -310,51 +317,52 @@ public class JavaTXCompiler {
 		Set<Set<UnifyPair>> results = new HashSet<>();
 		UnifyResultModel urm = null;
 		// urm.addUnifyResultListener(resultListener);
-		logFile = logFile == null ? new FileWriter("log_" + sourceFiles.keySet().iterator().next().getName()) : logFile;
+		UnifyContext context = new UnifyContext(logFile, log, true, urm, usedTasks, defaultClientPlaceholderRegistry);
-		Logger logger = new Logger(logFile, "TypeInferenceAsync");
+		try {
-		UnifyContext context = new UnifyContext(logger, true, urm, usedTasks, defaultClientPlaceholderRegistry);
+			logFile = logFile == null ? new FileWriter(new File("log_" + sourceFiles.keySet().iterator().next().getName())) : logFile;
+			IFiniteClosure finiteClosure = UnifyTypeFactory.generateFC(allClasses, logFile, getClassLoader(), this, context.placeholderRegistry());
+			System.out.println(finiteClosure);
+			urm = new UnifyResultModel(cons, finiteClosure);
+			urm.addUnifyResultListener(resultListener);
+			ConstraintSet<UnifyPair> unifyCons = UnifyTypeFactory.convert(this, cons, context.placeholderRegistry());
 
-		IFiniteClosure finiteClosure = UnifyTypeFactory.generateFC(allClasses, logger, getClassLoader(), this, context.placeholderRegistry());
+			Function<UnifyPair, UnifyPair> distributeInnerVars = x -> {
-		logger.info(finiteClosure.toString());
+				UnifyType lhs, rhs;
-		urm = new UnifyResultModel(cons, finiteClosure);
+				if (((lhs = x.getLhsType()) instanceof PlaceholderType) && ((rhs = x.getRhsType()) instanceof PlaceholderType) && (((PlaceholderType) lhs).isInnerType() || ((PlaceholderType) rhs).isInnerType())) {
-		urm.addUnifyResultListener(resultListener);
+					((PlaceholderType) lhs).setInnerType(true);
-		ConstraintSet<UnifyPair> unifyCons = UnifyTypeFactory.convert(this, cons, context.placeholderRegistry());
+					((PlaceholderType) rhs).setInnerType(true);
+				}
+				return x;
 
-		Function<UnifyPair, UnifyPair> distributeInnerVars = x -> {
+			};
-			UnifyType lhs, rhs;
+			logFile.write(unifyCons.toString());
-			if (((lhs = x.getLhsType()) instanceof PlaceholderType) && ((rhs = x.getRhsType()) instanceof PlaceholderType) && (((PlaceholderType) lhs).isInnerType() || ((PlaceholderType) rhs).isInnerType())) {
+			unifyCons = unifyCons.map(distributeInnerVars);
-				((PlaceholderType) lhs).setInnerType(true);
+			logFile.write(unifyCons.toString());
-				((PlaceholderType) rhs).setInnerType(true);
+			// Set<Set<UnifyPair>> results = new HashSet<>(); Nach vorne gezogen
+			logFile.write("FC:\\" + finiteClosure.toString() + "\n");
+			for (SourceFile f : this.sourceFiles.values()) {
+				logFile.write(ASTTypePrinter.print(f));
 			}
-			return x;
+			// logFile.flush();
+			Set<PlaceholderType> varianceTPHold;
+			Set<PlaceholderType> varianceTPH = new HashSet<>();
+			varianceTPH = varianceInheritanceConstraintSet(unifyCons);
 
-		};
+			/*
-		logger.debug(unifyCons.toString());
+			 * PL 2018-11-07 wird in varianceInheritanceConstraintSet erledigt do { //PL 2018-11-05 Huellenbildung Variance auf alle TPHs der Terme auf der jeweiligen //anderen Seite übertragen varianceTPHold = new HashSet<>(varianceTPH); varianceTPH = varianceInheritanceConstraintSet(unifyCons); unifyCons.map( y -> { if ((y.getLhsType() instanceof PlaceholderType) && (y.getRhsType() instanceof PlaceholderType)) { if (((PlaceholderType)y.getLhsType()).getVariance() != 0 &&
-		unifyCons = unifyCons.map(distributeInnerVars);
+			 * ((PlaceholderType)y.getRhsType()).getVariance() == 0) { ((PlaceholderType)y.getRhsType()).setVariance(((PlaceholderType)y.getLhsType( )).getVariance()); } if (((PlaceholderType)y.getLhsType()).getVariance() == 0 && ((PlaceholderType)y.getRhsType()).getVariance() != 0) { ((PlaceholderType)y.getLhsType()).setVariance(((PlaceholderType)y.getRhsType( )).getVariance()); } } return y; } ); } while (!varianceTPHold.equals(varianceTPH));
-		logger.debug(unifyCons.toString());
+			 */
-		// Set<Set<UnifyPair>> results = new HashSet<>(); Nach vorne gezogen
+
-		logger.debug("FC:\\" + finiteClosure.toString() + "\n");
+			// Set<Set<UnifyPair>> result = unify.unifySequential(xConsSet, finiteClosure,
-		for (SourceFile f : this.sourceFiles.values()) {
+			// logFile, log);
-			logger.debug(ASTTypePrinter.print(f));
+			// Set<Set<UnifyPair>> result = unify.unify(xConsSet, finiteClosure);
+			List<Set<Constraint<UnifyPair>>> oderConstraints = unifyCons.getOderConstraints()/*
+																								 * .stream().map(x -> { Set<Set<UnifyPair>> ret = new HashSet<>(); for (Constraint<UnifyPair> y : x) { ret.add(new HashSet<>(y)); } return ret; }).collect(Collectors. toCollection(ArrayList::new))
+																								 */;
+			TypeUnify.unifyAsync(unifyCons.getUndConstraints(), oderConstraints, finiteClosure, context);
+		} catch (IOException e) {
+			System.err.println("kein LogFile");
 		}
-		// logFile.flush();
-		Set<PlaceholderType> varianceTPHold;
-		Set<PlaceholderType> varianceTPH = new HashSet<>();
-		varianceTPH = varianceInheritanceConstraintSet(unifyCons);
-
-		/*
-		 * PL 2018-11-07 wird in varianceInheritanceConstraintSet erledigt do { //PL 2018-11-05 Huellenbildung Variance auf alle TPHs der Terme auf der jeweiligen //anderen Seite übertragen varianceTPHold = new HashSet<>(varianceTPH); varianceTPH = varianceInheritanceConstraintSet(unifyCons); unifyCons.map( y -> { if ((y.getLhsType() instanceof PlaceholderType) && (y.getRhsType() instanceof PlaceholderType)) { if (((PlaceholderType)y.getLhsType()).getVariance() != 0 &&
-		 * ((PlaceholderType)y.getRhsType()).getVariance() == 0) { ((PlaceholderType)y.getRhsType()).setVariance(((PlaceholderType)y.getLhsType( )).getVariance()); } if (((PlaceholderType)y.getLhsType()).getVariance() == 0 && ((PlaceholderType)y.getRhsType()).getVariance() != 0) { ((PlaceholderType)y.getLhsType()).setVariance(((PlaceholderType)y.getRhsType( )).getVariance()); } } return y; } ); } while (!varianceTPHold.equals(varianceTPH));
-		 */
-
-		// Set<Set<UnifyPair>> result = unify.unifySequential(xConsSet, finiteClosure,
-		// logFile, log);
-		// Set<Set<UnifyPair>> result = unify.unify(xConsSet, finiteClosure);
-		List<Set<Constraint<UnifyPair>>> oderConstraints = unifyCons.getOderConstraints()/*
-																							 * .stream().map(x -> { Set<Set<UnifyPair>> ret = new HashSet<>(); for (Constraint<UnifyPair> y : x) { ret.add(new HashSet<>(y)); } return ret; }).collect(Collectors. toCollection(ArrayList::new))
-																							 */;
-		TypeUnify.unifyAsync(unifyCons.getUndConstraints(), oderConstraints, finiteClosure, context);
-
 		return urm;
 	}
 
@@ -375,111 +383,103 @@ public class JavaTXCompiler {
 		final ConstraintSet<Pair> cons = getConstraints(file);
 		Set<Set<UnifyPair>> results = new HashSet<>();
 		PlaceholderRegistry placeholderRegistry = new PlaceholderRegistry();
+		try {
+			var logFolder = new File(System.getProperty("user.dir") + "/logFiles/");
+			if (log) logFolder.mkdirs();
+			Writer logFile = log ? new FileWriter(new File(logFolder, "log_" + sourceFiles.keySet().iterator().next().getName())) : new OutputStreamWriter(new NullOutputStream());
+			FiniteClosure finiteClosure = UnifyTypeFactory.generateFC(allClasses.stream().toList(), logFile, classLoader, this, placeholderRegistry);
+			System.out.println(finiteClosure);
+			ConstraintSet<UnifyPair> unifyCons = UnifyTypeFactory.convert(this, cons, placeholderRegistry);
+			System.out.println("xxx1");
+			Function<UnifyPair, UnifyPair> distributeInnerVars = x -> {
+				UnifyType lhs, rhs;
+				if (((lhs = x.getLhsType()) instanceof PlaceholderType) && ((rhs = x.getRhsType()) instanceof PlaceholderType) && (((PlaceholderType) lhs).isInnerType() || ((PlaceholderType) rhs).isInnerType())) {
+					((PlaceholderType) lhs).setInnerType(true);
+					((PlaceholderType) rhs).setInnerType(true);
+				}
+				return x;
 
-		var logFolder = new File(System.getProperty("user.dir") + "/logFiles/");
+			};
-		if (ConsoleInterface.writeLogFiles && !logFolder.mkdirs()) throw new RuntimeException("Could not creat directoy for log files: " + logFolder);
-		Writer logFile = ConsoleInterface.writeLogFiles ? new FileWriter(new File(logFolder, "log_" + sourceFiles.keySet().iterator().next().getName())) : new OutputStreamWriter(new NullOutputStream());
-		Logger logger = new Logger(logFile, "TypeInference");
 
-		FiniteClosure finiteClosure = UnifyTypeFactory.generateFC(allClasses.stream().toList(), logger, classLoader, this, placeholderRegistry);
+			logFile.write("Unify:" + unifyCons.toString());
-		logger.info(finiteClosure.toString());
+			System.out.println("Unify:" + unifyCons.toString());
-		ConstraintSet<UnifyPair> unifyCons = UnifyTypeFactory.convert(this, cons, placeholderRegistry);
+			unifyCons = unifyCons.map(distributeInnerVars);
-		logger.info("xxx1");
+			logFile.write("\nUnify_distributeInnerVars: " + unifyCons.toString());
-		Function<UnifyPair, UnifyPair> distributeInnerVars = x -> {
+			// Set<Set<UnifyPair>> results = new HashSet<>(); Nach vorne gezogen
-			UnifyType lhs, rhs;
+			logFile.write("FC:\\" + finiteClosure.toString() + "\n");
-			if (((lhs = x.getLhsType()) instanceof PlaceholderType) && ((rhs = x.getRhsType()) instanceof PlaceholderType) && (((PlaceholderType) lhs).isInnerType() || ((PlaceholderType) rhs).isInnerType())) {
+			logFile.write(ASTTypePrinter.print(sf));
-				((PlaceholderType) lhs).setInnerType(true);
+			System.out.println(ASTTypePrinter.print(sf));
-				((PlaceholderType) rhs).setInnerType(true);
+			// logFile.flush();
-			}
+			System.out.println("Unify nach Oder-Constraints-Anpassung:" + unifyCons.toString());
-			return x;
+			Set<PlaceholderType> varianceTPHold;
+			Set<PlaceholderType> varianceTPH = new HashSet<>();
+			varianceTPH = varianceInheritanceConstraintSet(unifyCons);
 
-		};
+			/*
+			 * PL 2018-11-07 wird in varianceInheritanceConstraintSet erledigt do { //PL 2018-11-05 Huellenbildung Variance auf alle TPHs der Terme auf der jeweiligen //anderen Seite übertragen varianceTPHold = new HashSet<>(varianceTPH); varianceTPH = varianceInheritanceConstraintSet(unifyCons); unifyCons.map( y -> { if ((y.getLhsType() instanceof PlaceholderType) && (y.getRhsType() instanceof PlaceholderType)) { if (((PlaceholderType)y.getLhsType()).getVariance() != 0 &&
+			 * ((PlaceholderType)y.getRhsType()).getVariance() == 0) { ((PlaceholderType)y.getRhsType()).setVariance(((PlaceholderType)y.getLhsType( )).getVariance()); } if (((PlaceholderType)y.getLhsType()).getVariance() == 0 && ((PlaceholderType)y.getRhsType()).getVariance() != 0) { ((PlaceholderType)y.getLhsType()).setVariance(((PlaceholderType)y.getRhsType( )).getVariance()); } } return y; } ); } while (!varianceTPHold.equals(varianceTPH));
+			 */
 
-    logger.debug("Unify:" + unifyCons.toString());
+			// Set<Set<UnifyPair>> result = unify.unifySequential(xConsSet, finiteClosure,
-    logger.info("Unify:" + unifyCons.toString());
+			// logFile, log);
-    unifyCons = unifyCons.map(distributeInnerVars);
+			// Set<Set<UnifyPair>> result = unify.unify(xConsSet, finiteClosure);
-    logger.debug("\nUnify_distributeInnerVars: " + unifyCons.toString());
+			List<Set<Constraint<UnifyPair>>> oderConstraints = unifyCons.getOderConstraints()// .stream().map(x -> {
-    // Set<Set<UnifyPair>> results = new HashSet<>(); Nach vorne gezogen
+			/*
-    logger.debug("FC:\\" + finiteClosure.toString() + "\n");
+			 * Set<Set<UnifyPair>> ret = new HashSet<>(); for (Constraint<UnifyPair> y : x) { ret.add(new HashSet<>(y)); } return ret; }).collect(Collectors.toCollection(ArrayList::new))
-    logger.info(ASTTypePrinter.print(sf));
+			 */;
-    // logFile.flush();
-    List<UnifyPair> andConstraintsSorted = unifyCons.getUndConstraints().stream()
-        .sorted(Comparator.comparing(UnifyPair::getPairOp).thenComparing(UnifyPair::getLhsType, Comparator.comparing(UnifyType::getName)))
-        .collect(Collectors.toList());
 
-    logger.info(andConstraintsSorted);
+		  if (unifyServer.isPresent()) {
-
+				UnifyResultModel urm = new UnifyResultModel(cons, finiteClosure);
-    Set<PlaceholderType> varianceTPHold;
+				UnifyContext context = new UnifyContext(logFile, log, true, urm, usedTasks, placeholderRegistry);
-    Set<PlaceholderType> varianceTPH = new HashSet<>();
+				SocketClient socketClient = new SocketClient(unifyServer.get());
-    varianceTPH = varianceInheritanceConstraintSet(unifyCons);
+				return socketClient.execute(finiteClosure, cons, unifyCons, context);
-
+		  }
-		/*
+			else if (resultmodel) {
-		 * PL 2018-11-07 wird in varianceInheritanceConstraintSet erledigt do { //PL 2018-11-05 Huellenbildung Variance auf alle TPHs der Terme auf der jeweiligen //anderen Seite übertragen varianceTPHold = new HashSet<>(varianceTPH); varianceTPH = varianceInheritanceConstraintSet(unifyCons); unifyCons.map( y -> { if ((y.getLhsType() instanceof PlaceholderType) && (y.getRhsType() instanceof PlaceholderType)) { if (((PlaceholderType)y.getLhsType()).getVariance() != 0 &&
+				/* UnifyResultModel Anfang */
-		 * ((PlaceholderType)y.getRhsType()).getVariance() == 0) { ((PlaceholderType)y.getRhsType()).setVariance(((PlaceholderType)y.getLhsType( )).getVariance()); } if (((PlaceholderType)y.getLhsType()).getVariance() == 0 && ((PlaceholderType)y.getRhsType()).getVariance() != 0) { ((PlaceholderType)y.getLhsType()).setVariance(((PlaceholderType)y.getRhsType( )).getVariance()); } } return y; } ); } while (!varianceTPHold.equals(varianceTPH));
+				UnifyResultModel urm = new UnifyResultModel(cons, finiteClosure);
-		 */
+				UnifyResultListenerImpl li = new UnifyResultListenerImpl();
-
+				urm.addUnifyResultListener(li);
-    // Set<Set<UnifyPair>> result = unify.unifySequential(xConsSet, finiteClosure,
+				UnifyContext context = new UnifyContext(logFile, log, true, urm, usedTasks, placeholderRegistry);
-    // logFile, log);
-    // Set<Set<UnifyPair>> result = unify.unify(xConsSet, finiteClosure);
-    List<Set<Constraint<UnifyPair>>> oderConstraints = unifyCons.getOderConstraints()// .stream().map(x -> {
-    /*
-     * Set<Set<UnifyPair>> ret = new HashSet<>(); for (Constraint<UnifyPair> y : x) { ret.add(new HashSet<>(y)); } return ret; }).collect(Collectors.toCollection(ArrayList::new))
-     */;
-    if (ConsoleInterface.unifyServerUrl.isPresent()) {
-        UnifyResultModel urm = new UnifyResultModel(cons, finiteClosure);
-        UnifyContext context = new UnifyContext(logger, true, urm, usedTasks, placeholderRegistry);
-        SocketFuture<UnifyResultPacket> future = SocketClient.execute(
-          UnifyRequestPacket.create(finiteClosure, cons, unifyCons, context.placeholderRegistry())
-        );
-        SocketClient.execute(SetAutoclosePacket.create());
-        return future.get().getResultSet(context);
-    }
-    else if (resultmodel) {
-        /* UnifyResultModel Anfang */
-        UnifyResultModel urm = new UnifyResultModel(cons, finiteClosure);
-        UnifyResultListenerImpl li = new UnifyResultListenerImpl();
-        urm.addUnifyResultListener(li);
-				UnifyContext context = new UnifyContext(logger, true, urm, usedTasks, placeholderRegistry);
 				TypeUnify.unifyParallel(unifyCons.getUndConstraints(), oderConstraints, finiteClosure, context);
-        var finalResults = li.getResults().stream().sorted().toList();
+				System.out.println("RESULT Final: " + li.getResults());
-        int i = 0;
+				System.out.println("Constraints for Generated Generics: " + " ???");
-        logger.info("RESULT Final: ");
+				logFile.write("RES_FINAL: " + li.getResults().toString() + "\n");
-        for (var result : finalResults){
+				// logFile.flush();
-          logger.info("Result: " + i++);
+				return li.getResults();
-          logger.info(result.getSortedResults());
+			}
-        }
+			/* UnifyResultModel End */
-        logger.info("RES_FINAL: " + li.getResults().toString() + "\n");
+			else {
-        return li.getResults();
+				// Set<Set<UnifyPair>> result = unify.unify(unifyCons.getUndConstraints(),
-    }
+				// oderConstraints, finiteClosure, logFile, log, new UnifyResultModel(cons,
-    /* UnifyResultModel End */
+				// finiteClosure));
-    else {
+				UnifyContext context = new UnifyContext(logFile, log, false, new UnifyResultModel(cons, finiteClosure), usedTasks, placeholderRegistry);
-        // Set<Set<UnifyPair>> result = unify.unify(unifyCons.getUndConstraints(),
+				Set<Set<UnifyPair>> result = TypeUnify.unifyOderConstraints(unifyCons.getUndConstraints(), oderConstraints, finiteClosure, context);
-        // oderConstraints, finiteClosure, logFile, log, new UnifyResultModel(cons,
+				System.out.println("RESULT: " + result);
-        // finiteClosure));
+				logFile.write("RES: " + result.toString() + "\n");
-        UnifyContext context = new UnifyContext(logger, false, new UnifyResultModel(cons, finiteClosure), usedTasks, placeholderRegistry);
+				// logFile.flush();
-        Set<Set<UnifyPair>> result = TypeUnify.unifyOderConstraints(unifyCons.getUndConstraints(), oderConstraints, finiteClosure, context);
+				results.addAll(result);
-        logger.info("RESULT: " + result);
-        results.addAll(result);
 
-        results = results.stream().map(x -> {
+				results = results.stream().map(x -> {
-          Optional<Set<UnifyPair>> res = new RuleSet(placeholderRegistry).subst(x.stream().map(y -> {
+					Optional<Set<UnifyPair>> res = new RuleSet(placeholderRegistry).subst(x.stream().map(y -> {
-            if (y.getPairOp() == PairOperator.SMALLERDOTWC)
+						if (y.getPairOp() == PairOperator.SMALLERDOTWC)
-              y.setPairOp(PairOperator.EQUALSDOT);
+							y.setPairOp(PairOperator.EQUALSDOT);
-            return y; // alle Paare a <.? b erden durch a =. b ersetzt
+						return y; // alle Paare a <.? b erden durch a =. b ersetzt
-          }).collect(Collectors.toCollection(HashSet::new)));
+					}).collect(Collectors.toCollection(HashSet::new)));
-          if (res.isPresent()) {// wenn subst ein Erg liefert wurde was veraendert
+					if (res.isPresent()) {// wenn subst ein Erg liefert wurde was veraendert
-            return new TypeUnifyTask(context).applyTypeUnificationRules(res.get(), finiteClosure);
+						return new TypeUnifyTask(context).applyTypeUnificationRules(res.get(), finiteClosure);
-          } else
+					} else
-            return x; // wenn nichts veraendert wurde wird x zurueckgegeben
+						return x; // wenn nichts veraendert wurde wird x zurueckgegeben
-        }).collect(Collectors.toCollection(HashSet::new));
+				}).collect(Collectors.toCollection(HashSet::new));
-        logger.info("RESULT Final: " + results);
+				System.out.println("RESULT Final: " + results);
-        logger.info("Constraints for Generated Generics: " + " ???");
+				System.out.println("Constraints for Generated Generics: " + " ???");
-        logger.debug("RES_FINAL: " + results.toString() + "\n");
+				logFile.write("RES_FINAL: " + results.toString() + "\n");
-        // logFile.flush();
+				// logFile.flush();
-        logger.debug("PLACEHOLDERS: " + placeholderRegistry);
+				logFile.write("PLACEHOLDERS: " + placeholderRegistry);
-        // logFile.flush();
+				// logFile.flush();
+			}
+		} catch (IOException e) {
+			System.err.println("kein LogFile");
 		}
-
 		return results.stream().map((unifyPairs -> new ResultSet(UnifyTypeFactory.convert(unifyPairs, Pair.generateTPHMap(cons), placeholderRegistry)))).collect(Collectors.toList());
 	}
 
@@ -653,12 +653,12 @@ public class JavaTXCompiler {
 			var codegen = new Codegen(converter.convert(clazz), this, converter);
 			var code = codegen.generate();
 			generatedClasses.put(clazz.getClassName(), code);
+			converter.auxiliaries.forEach((name, source) -> {
+				generatedClasses.put(new JavaClassName(name), source);
+			});
 		}
 		generatedGenerics.put(sf, converter.javaGenerics());
 		converter.generateFunNTypes();
-		converter.auxiliaries.forEach((name, source) -> {
-			generatedClasses.put(new JavaClassName(name), source);
-		});
 		return generatedClasses;
 	}
 
@@ -666,15 +666,15 @@ public class JavaTXCompiler {
 		FileOutputStream output;
 		for (JavaClassName name : classFiles.keySet()) {
 			byte[] bytecode = classFiles.get(name);
-			defaultLogger.info("generating " + name + ".class file ...");
+			System.out.println("generating " + name + ".class file ...");
 			var subPath = preserveHierarchy ? path : Path.of(path.toString(), name.getPackageName().split("\\.")).toFile();
 			File outputFile = new File(subPath, name.getClassName() + ".class");
 			outputFile.getAbsoluteFile().getParentFile().mkdirs();
-			defaultLogger.info(outputFile.toString());
+			System.out.println(outputFile);
 			output = new FileOutputStream(outputFile);
 			output.write(bytecode);
 			output.close();
-			defaultLogger.success(name + ".class file generated");
+			System.out.println(name + ".class file generated");
 		}
 	}
 

src/main/java/de/dhbwstuttgart/core/JavaTXServer.java

@@ -10,10 +10,10 @@ public class JavaTXServer {
 
   public JavaTXServer(int port) {
     this.socketServer = new SocketServer(port);
+    isRunning = true;
   }
 
   public void listen() {
-    isRunning = true;
     socketServer.start();
   }
 

src/main/java/de/dhbwstuttgart/environment/ByteArrayClassLoader.java

@@ -0,0 +1,13 @@
+package de.dhbwstuttgart.environment;
+
+public class ByteArrayClassLoader extends ClassLoader implements IByteArrayClassLoader {
+    @Override
+    public Class _defineClass(String name, byte[] code, int i, int length) throws ClassFormatError {
+        return defineClass(name, code, i, length);
+    }
+
+    @Override
+    public Class<?> findClass(String name) throws ClassNotFoundException {
+        return super.findClass(name);
+    }
+}

src/main/java/de/dhbwstuttgart/environment/IByteArrayClassLoader.java

@@ -6,22 +6,18 @@ import java.nio.file.Path;
 
 public interface IByteArrayClassLoader {
 
-    Class<?> loadClass(String path) throws ClassNotFoundException;
+    Class loadClass(String path) throws ClassNotFoundException;
 
-    default Class<?> loadClass(byte[] code) {
+    default Class loadClass(byte[] code) {
-        return this.loadClass(null, code);
+        return this._defineClass(null, code, 0, code.length);
     }
 
-    default Class<?> loadClass(String name, byte[] code) {
+    default Class loadClass(Path path) throws IOException {
-        return this._defineClass(name, code, 0, code.length);
-    }
-
-    default Class<?> loadClass(Path path) throws IOException {
         var code = Files.readAllBytes(path);
         return this._defineClass(null, code, 0, code.length);
     }
 
     public Class<?> findClass(String name) throws ClassNotFoundException;
 
-    Class<?> _defineClass(String name, byte[] code, int i, int length) throws ClassFormatError;
+    Class _defineClass(String name, byte[] code, int i, int length) throws ClassFormatError;
 }

src/main/java/de/dhbwstuttgart/parser/JavaTXParser.java

@@ -7,7 +7,6 @@ import de.dhbwstuttgart.parser.antlr.Java17Parser;
 import de.dhbwstuttgart.parser.scope.JavaClassRegistry;
 import de.dhbwstuttgart.syntaxtree.SourceFile;
 
-import de.dhbwstuttgart.util.Logger;
 import org.antlr.v4.runtime.CharStream;
 import org.antlr.v4.runtime.CharStreams;
 import org.antlr.v4.runtime.CommonTokenStream;
@@ -18,9 +17,6 @@ import java.util.ArrayList;
 import java.util.List;
 
 public class JavaTXParser {
-
-    public static Logger logger = new Logger("Parser");
-
     public static Java17Parser.SourceFileContext parse(File source) throws IOException, java.lang.ClassNotFoundException {
         InputStream stream = new FileInputStream(source);
         // DEPRECATED: ANTLRInputStream input = new ANTLRInputStream(stream);

src/main/java/de/dhbwstuttgart/parser/SyntaxTreeGenerator/StatementGenerator.java

@@ -1,6 +1,5 @@
 package de.dhbwstuttgart.parser.SyntaxTreeGenerator;
 
-import de.dhbwstuttgart.parser.JavaTXParser;
 import java.lang.reflect.Modifier;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -260,7 +259,7 @@ public class StatementGenerator {
             ret.setStatement();
             return ret;
         default:
-            JavaTXParser.logger.info(stmt.getClass());
+            System.out.println(stmt.getClass());
             throw new NotImplementedException();
         }
     }
@@ -1100,9 +1099,9 @@ public class StatementGenerator {
             block = lambdaGenerator.convert(expression.lambdaBody().block(), true);
         }
         List<RefTypeOrTPHOrWildcardOrGeneric> funNParams = new ArrayList<>();
-        funNParams.add(TypePlaceholder.fresh(expression.getStart(), -1, false));// ret-Type
+        funNParams.add(TypePlaceholder.fresh(expression.getStart()));// ret-Type
         params.getFormalparalist().forEach(formalParameter -> // Für jeden Parameter einen TPH anfügen:
-        	funNParams.add(TypePlaceholder.fresh(expression.getStart(), 1, false)));
+        funNParams.add(TypePlaceholder.fresh(expression.getStart())));
         RefTypeOrTPHOrWildcardOrGeneric lambdaType = TypePlaceholder.fresh(expression.getStart());
         // RefType lambdaType = new
         // RefType(reg.getName("Fun"+params.getFormalparalist().size()),

src/main/java/de/dhbwstuttgart/parser/SyntaxTreeGenerator/TypeGenerator.java

@@ -74,7 +74,7 @@ public class TypeGenerator {
                 throw new NotImplementedException();
             }
         } else if (!typeContext.LBRACK().isEmpty()) { // ArrayType über eckige Klammer prüfen
-            // JavaTXParser.logger.info(unannTypeContext.getText());
+            // System.out.println(unannTypeContext.getText());
             throw new NotImplementedException();
         }
         /*

src/main/java/de/dhbwstuttgart/parser/scope/JavaClassRegistry.java

@@ -7,7 +7,7 @@ import java.util.*;
 /**
  * Speichert die Klassen f<>r einen bestimmten Projektscope
  */
-public class JavaClassRegistry{
+public class JavaClassRegistry {
     final Map<JavaClassName, Integer> existingClasses = new HashMap<>();
 
     public JavaClassRegistry(Map<String, Integer> initialNames) {
@@ -22,10 +22,6 @@ public class JavaClassRegistry{
         }
     }
 
-    public Set<JavaClassName> getAllClassNames(){
-        return existingClasses.keySet();
-    }
-
     public void addName(String className, int numberOfGenerics) {
         existingClasses.put(new JavaClassName(className), numberOfGenerics);
     }

src/main/java/de/dhbwstuttgart/server/ServerTaskLogger.java

@@ -1,41 +0,0 @@
-package de.dhbwstuttgart.server;
-
-import de.dhbwstuttgart.util.Logger;
-import java.time.LocalDateTime;
-import java.time.format.DateTimeFormatter;
-import org.java_websocket.WebSocket;
-
-public class ServerTaskLogger extends Logger {
-
-  private final WebSocket webSocket;
-  private final SocketServer socketServer;
-  private final LogLevel customLogLevel;
-
-  public ServerTaskLogger(WebSocket webSocket, SocketServer socketServer, LogLevel customLogLevel) {
-    this.webSocket = webSocket;
-    this.socketServer = socketServer;
-    this.customLogLevel = customLogLevel;
-  }
-
-  @Override
-  public boolean isLogLevelActive(LogLevel logLevel) {
-    return logLevel.isHigherOrEqualTo(customLogLevel);
-  }
-
-  @Override
-  protected void print(String s, LogLevel logLevel) {
-    String coloredPrefix = this.getPrefix(logLevel);
-    if (logLevel.isHigherOrEqualTo(LogLevel.ERROR)) {
-      socketServer.sendError(webSocket, coloredPrefix + s, false);
-    }
-    else {
-      socketServer.sendMessage(webSocket, coloredPrefix + s);
-    }
-  }
-
-  @Override
-  protected void write(String s) {
-    // under no circumstances write anything to a file
-  }
-
-}

src/main/java/de/dhbwstuttgart/server/SocketClient.java

@@ -1,8 +1,6 @@
 package de.dhbwstuttgart.server;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
-import de.dhbwstuttgart.core.ConsoleInterface;
-import de.dhbwstuttgart.server.packet.IClientToServerPacket;
 import de.dhbwstuttgart.server.packet.IPacket;
 import de.dhbwstuttgart.server.packet.IServerToClientPacket;
 import de.dhbwstuttgart.server.packet.PacketContainer;
@@ -14,12 +12,10 @@ import de.dhbwstuttgart.typeinference.result.ResultSet;
 import de.dhbwstuttgart.typeinference.unify.UnifyContext;
 import de.dhbwstuttgart.typeinference.unify.model.FiniteClosure;
 import de.dhbwstuttgart.typeinference.unify.model.UnifyPair;
-import de.dhbwstuttgart.util.Logger;
 import java.net.URI;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CountDownLatch;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -33,33 +29,39 @@ import org.java_websocket.handshake.ServerHandshake;
  */
 public class SocketClient extends WebSocketClient {
 
-  public static Logger logger = new Logger("SocketClient");
+  // use a latch to wait until the connection is closed by the remote host
+  private final CountDownLatch closeLatch = new CountDownLatch(1);
+  // temporarily: The received unify result
+  // TODO: replace with uuid and future system, such that responses can be mapped by a uuid to fulfill a Future
+  private UnifyResultPacket unifyResultPacket;
 
-  /**
+  public SocketClient(String url) {
-   * The singleton object
+    super(URI.create(url), Map.of(
-   */
+      "packetProtocolVersion", SocketServer.packetProtocolVersion
-  private static SocketClient socketClient = null;
+    ));
-
+    // make sure, the url is in a valid format
-  /**
-   * List of futures that are still waiting to be fulfilled
-   */
-  private final Map<String, SocketFuture<?>> responseFutures = new HashMap<>();
-
-  private SocketClient(String url) {
-    super(
-      URI.create(url), // target url
-      //SocketServer.perMessageDeflateDraft, // enable compression
-      Map.of( // headers
-        "packetProtocolVersion", SocketServer.packetProtocolVersion
-      )
-    );
-
-    // make sure the url is in a valid format
     final String regex = "^wss?://(\\w+(\\.\\w+)?)*:(\\d+)$";
     final Matcher matcher = Pattern.compile(regex).matcher(url);
     if (!matcher.find()) {
       throw new RuntimeException("Provided string \"" + url + "\" is not a valid server URL! Use pattern ws(s?)://<host.name>:<port>");
     }
+  }
+
+  public SocketClient(String host, int port, boolean secure) {
+    super(URI.create(String.format("%s://%s:%d/", secure ? "wss" : "ws", host, port)));
+  }
+
+  /**
+   * The main method for connecting, requesting and waiting for the server to unify.
+   * This is synchronized to prevent multiple webSockets connections at the moment, but it is not called from any
+   * thread except the main thread right now and is not necessary at all, probably. Maybe remove it later
+   */
+  synchronized public List<ResultSet> execute(
+    FiniteClosure finiteClosure,
+    ConstraintSet<Pair> constraintSet,
+    ConstraintSet<UnifyPair> unifyConstraintSet,
+    UnifyContext context
+  ) throws JsonProcessingException {
 
     try {
       // wait for the connection to be set up
@@ -68,135 +70,89 @@ public class SocketClient extends WebSocketClient {
       if (this.getReadyState() != ReadyState.OPEN) {
         throw new RuntimeException("WebSocket Client could not connect to remote host at " + this.uri);
       }
-    } catch (InterruptedException exception) {
-      throw new RuntimeException(exception);
-    }
 
-    // add a shutdown hook to close the connection when the process ends or is stopped by a SIGINT signal
+      // send the unify task request
-    Runtime.getRuntime().addShutdownHook(new Thread(this::close));
+      UnifyRequestPacket packet = new UnifyRequestPacket(finiteClosure, constraintSet, unifyConstraintSet, context.placeholderRegistry());
-  }
-
-  private SocketClient(String host, int port, boolean secure) throws InterruptedException {
-    this(String.format("%s://%s:%d/", secure ? "wss" : "ws", host, port));
-  }
-
-  /**
-   * Singleton access method, creates one if none is available
-   *
-   * @return The one and only socketClient
-   */
-  private static SocketClient initializeClient() {
-    if (socketClient == null) {
-      socketClient = new SocketClient(ConsoleInterface.unifyServerUrl.get());
-    }
-    return socketClient;
-  }
-
-  /**
-   * Send a packet to the server (connection will be created, if none is found) and return a future
-   * for the response packet
-   */
-  synchronized public static <T extends IServerToClientPacket> SocketFuture<T> execute(IClientToServerPacket<T> packet) {
-    SocketClient client = initializeClient();
-
-    /*
-     * Create a future that will be associated with the packet and eventually completed
-     */
-    SocketFuture<T> future = packet.getFuture();
-    if (!future.isDone()) {
-      client.responseFutures.put(future.futureId, future);
-    }
-
-    /*
-     * Establish connection, if not already done.
-     * Serialize the packet and send it to the server.
-     * Return the future to be handled by the caller.
-     */
-    try {
       String json = PacketContainer.serialize(packet);
-      client.send(json);
+      this.send(json);
-    } catch (Exception exception) {
+
-      logger.exception(exception);
+      // block the thread, until the connection is closed by the remote host (usually after sending the results)
+      this.waitUntilClosed();
+      // wait for the connection to fully close
+      this.closeBlocking();
+    } catch (InterruptedException exception) {
+      System.err.println("Server connection interrupted: " + exception);
+      this.notifyAll();
+      throw new RuntimeException("Aborted server connection", exception);
+    }
+    catch (Exception exception) {
       throw new RuntimeException("Exception occurred in server connection: ", exception);
     }
 
-    return future;
+    // detect error cases, in which no error was thrown, but also no result was sent back from the server
+    if (this.unifyResultPacket == null) {
+      throw new RuntimeException("Did not receive server response but closed connection already");
+    }
+
+    return unifyResultPacket.getResultSet(context);
   }
 
   /**
-   * Shortcut for waiting and retrieving the response immediately
+   *  Specific client-side implementations to handle incoming packets
-   *
-   * @param packet The packet to send
-   * @param <T>    The type of response packet to await
-   * @return The response packet, once it is received
-   */
-  public static <T extends IServerToClientPacket> T executeAndGet(IClientToServerPacket<T> packet) {
-    return SocketClient.execute(packet).get();
-  }
-
-  /**
-   * Specific client-side implementations to handle incoming packets
    */
   protected void handleReceivedPacket(IPacket packet) {
-    if (!(packet instanceof IServerToClientPacket serverToClientPacket)) {
+    if (packet instanceof IServerToClientPacket serverToClientPacket) {
-      System.err.println("Received package of invalid type + " + packet.getClass().getName());
+
-      this.close();
+      try {
+        serverToClientPacket.onHandle(this.getConnection(), this);
+      }
+      catch (Exception exception) {
+        this.closeLatch.countDown();
+        this.close();
+        throw exception;
+      }
+
       return;
     }
 
-    serverToClientPacket.onHandle(this.getConnection(), this);
+    System.err.println("Received package of invalid type + " + packet.getClass().getName());
+    this.close();
   }
 
-  /**
+  public void setUnifyResultSets(UnifyResultPacket unifyResultPacket) {
-   * Complete a registered future, so it can be handled by whoever executed the creator task
+    this.unifyResultPacket = unifyResultPacket;
-   *
-   * @param id      The associated id for this future
-   * @param trigger The object triggering the completion
-   */
-  public void completeResponseFuture(String id, IServerToClientPacket trigger) {
-    SocketFuture<?> future = this.responseFutures.remove(id);
-    if (future == null) return;
-    if (!future.accept(trigger)) {
-      throw new RuntimeException("Packet " + trigger.getClass().getName() + " tried to complete future, but was not allowed to");
-    }
-  }
-
-  public static void closeIfOpen() {
-    if (socketClient != null && socketClient.isOpen()) {
-      socketClient.close();
-    }
   }
 
   @Override
   public void onOpen(ServerHandshake handshakedata) {
-    logger.success("Connected to server with status " + handshakedata.getHttpStatus());
+    System.out.println("Connected to server with status " + handshakedata.getHttpStatus());
   }
 
   @Override
   public void onMessage(String message) {
-    // logger.info("received: " + message);
+    // System.out.println("received: " + message);
     IPacket packet = PacketContainer.deserialize(message);
     this.handleReceivedPacket(packet);
   }
 
   @Override
   public void onClose(int code, String reason, boolean remote) {
-    logger.info(
+    System.out.println(
       "Disconnected from server " +
         "with code " + code + " " +
         (reason.isEmpty() ? "" : "and reason " + reason + " ") +
         "(closed by remote: " + remote + ")"
     );
-
+    this.closeLatch.countDown();
-    if (!this.responseFutures.isEmpty()) {
-      throw new RuntimeException("Server closed before all required tasks were answered");
-    }
   }
 
   @Override
   public void onError(Exception e) {
-    logger.exception(e);
+    System.out.println("Error: " + e.getMessage());
-    throw new RuntimeException(e);
+    e.printStackTrace();
   }
 
+  public void waitUntilClosed() throws InterruptedException {
+    closeLatch.await();
+  }
 }

src/main/java/de/dhbwstuttgart/server/SocketFuture.java

@@ -1,48 +0,0 @@
-package de.dhbwstuttgart.server;
-
-import de.dhbwstuttgart.server.packet.IServerToClientPacket;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.UUID;
-import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.ExecutionException;
-
-public class SocketFuture<T extends IServerToClientPacket> extends CompletableFuture<T> {
-
-  public final String futureId = UUID.randomUUID().toString();
-
-  public final List<Class<T>> allowedTriggers;
-
-  public SocketFuture(List<Class<T>> allowedTriggers) {
-    this.allowedTriggers = allowedTriggers;
-  }
-
-  public boolean accept(IServerToClientPacket trigger) {
-    if (this.allowedTriggers.contains(trigger.getClass())) {
-      this.complete((T)trigger);
-      return true;
-    }
-    return false;
-  }
-
-  @Override
-  public T get() {
-    try {
-      return super.get();
-    }
-    catch (InterruptedException | ExecutionException exception) {
-      throw new RuntimeException(exception);
-    }
-  }
-
-  /**
-   * Special case where the future is immediately fulfilled without a response package similar to
-   * <code>CompletableFuture.completedFuture()</code> but without a value
-   */
-  public static <R extends IServerToClientPacket> SocketFuture<R> completedFuture() {
-    SocketFuture<R> dummyFuture = new SocketFuture<>(new ArrayList<>(0));
-    dummyFuture.complete(null);
-    return dummyFuture;
-  }
-
-}

src/main/java/de/dhbwstuttgart/server/SocketServer.java

@@ -6,104 +6,76 @@ import de.dhbwstuttgart.server.packet.IClientToServerPacket;
 import de.dhbwstuttgart.server.packet.IPacket;
 import de.dhbwstuttgart.server.packet.MessagePacket;
 import de.dhbwstuttgart.server.packet.PacketContainer;
-import de.dhbwstuttgart.util.Logger;
 import java.net.InetSocketAddress;
-import java.util.Collections;
+import java.util.Objects;
 import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
-import java.util.concurrent.SynchronousQueue;
-import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 import org.java_websocket.WebSocket;
-import org.java_websocket.drafts.Draft;
-import org.java_websocket.drafts.Draft_6455;
-import org.java_websocket.extensions.permessage_deflate.PerMessageDeflateExtension;
 import org.java_websocket.handshake.ClientHandshake;
 import org.java_websocket.server.WebSocketServer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class SocketServer extends WebSocketServer {
 
-  public static Logger logger = new Logger("SocketServer");
-  public static final int maxTasksPerSession = 100;
-  private static boolean serverRunning = false;
-
   /**
    * Increase this every time a breaking change to the server communication is done.
-   * This will prevent errors when the server version and client version do not match.
+   * This will prevent errors when server version and client version do not match.
    */
   public static final String packetProtocolVersion = "1";
 
-  // create an executor for tasks that will always keep at least one task around
+  public static final Logger log = LoggerFactory.getLogger(SocketServer.class);
-  private final ThreadPoolExecutor taskExecutor = new ThreadPoolExecutor(1, Integer.MAX_VALUE,60L, TimeUnit.SECONDS, new SynchronousQueue<>());
-  // create an executor for scheduling timeouts
-  private final ScheduledExecutorService timeoutExecutor = Executors.newSingleThreadScheduledExecutor();
 
   public SocketServer(int port) {
     super(new InetSocketAddress(port));
-    this.setConnectionLostTimeout(30);
-
-    serverRunning = true;
-    // add a shutdown hook to close all connections when the process ends or is stopped by a SIGINT signal
-    Runtime.getRuntime().addShutdownHook(new Thread(this::onShutdown));
-  }
-
-  public static boolean isServerRunning() {
-    return serverRunning;
-  }
-
-  private void onShutdown() {
-    serverRunning = false;
-    try {
-      for (var webSocket : this.getConnections()) {
-        this.sendError(webSocket, "Sorry, i am shutting down. You are now on your own, good Luck!", true);
-        webSocket.close();
-      }
-      this.stop();
-      taskExecutor.shutdown();
-      timeoutExecutor.shutdown();
-    } catch (InterruptedException exception) {
-      // we are shutting down anyway
-    }
   }
 
   @Override
   public void onOpen(WebSocket webSocket, ClientHandshake clientHandshake) {
     String ppv = clientHandshake.getFieldValue("packetProtocolVersion");
     if (!ppv.equals(packetProtocolVersion)) {
-      this.sendError(webSocket,
+      try {
-        "Mismatch in packet protocol version! Client (you): \"" + ppv + "\" and Server (me): \"" + packetProtocolVersion + "\"",
+        ErrorPacket errorPacket = ErrorPacket.create(
-        true
+          "Mismatch in packet protocol version! Client (you): " + ppv + " and Server (me): " + packetProtocolVersion,
-      );
+          true
+        );
+        webSocket.send(PacketContainer.serialize(errorPacket));
+      }
+      catch (JsonProcessingException exception) {
+        System.err.println("Failed to serialize json: " + exception);
+      }
       webSocket.close(1);
       return;
     }
 
-    SocketData socketData = new SocketData(webSocket);
+
-    logger.info("New connection: " + socketData.id + " (with ppv " + ppv + ")");
+    SocketData socketData = new SocketData(UUID.randomUUID().toString());
+    webSocket.setAttachment(socketData);
+    System.out.println("New connection: " + socketData.id + " (with ppv " + ppv + ")");
 
     try {
       sendMessage(webSocket, "Welcome to the server!");
 
       // wait 10 seconds for the client to send a task and close the connection if nothing has been received until then
-      final int secondsUntilTimeout = 10;
+      try (ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor()) {
-      timeoutExecutor.schedule(() -> {
+        Runnable task = () -> {
-          if (webSocket.<SocketData>getAttachment().totalTasks.get() > 0 || !webSocket.isOpen()) {
+          if (webSocket.<SocketData>getAttachment().unhandledTasks.get() == 0 || !webSocket.isOpen()) {
             return;
           }
-          sendMessage(webSocket, "No task received after " + secondsUntilTimeout + " seconds. Closing connection...");
+          sendMessage(webSocket, "No task received after 10 seconds. Closing connection...");
           webSocket.close();
-        },
+        };
-        secondsUntilTimeout,
+        executor.schedule(task, 10, TimeUnit.SECONDS);
-        TimeUnit.SECONDS
+        executor.shutdown();
-      );
+      }
 
       // and finally, when your program wants to exit
     } catch (Exception e) {
-      logger.exception(e);
+      log.error("e: ", e);
       webSocket.close(1, e.getMessage());
     }
   }
@@ -111,8 +83,8 @@ public class SocketServer extends WebSocketServer {
   @Override
   public void onClose(WebSocket webSocket, int code, String reason, boolean remote) {
     SocketData socketData = webSocket.getAttachment();
-    logger.info("Connection closed: " + socketData.id);
+    System.out.println("Connection closed: " + socketData.id);
-    logger.info(
+    System.out.println(
       "Disconnected client " + socketData.id + " " +
         "with code " + code + " " +
         (reason.isEmpty() ? "" : "and reason " + reason + " ") +
@@ -123,28 +95,24 @@ public class SocketServer extends WebSocketServer {
 
   @Override
   public void onMessage(WebSocket webSocket, String s) {
-    // logger.info("Received: " + s.substring(0, 50));
+    // System.out.println("Received: " + s.substring(0, 50));
     IPacket reconstructedPacket = PacketContainer.deserialize(s);
     try {
       this.onPacketReceived(webSocket, reconstructedPacket);
     } catch (JsonProcessingException e) {
-      logger.exception(e);
+      this.log("Error on processing incoming package: " + e.getMessage(), webSocket);
-      this.log(webSocket, "Error on processing incoming package: " + e.getMessage());
     }
   }
 
   @Override
   public void onError(WebSocket webSocket, Exception e) {
-    if (webSocket != null) {
+    log(e.getMessage(), webSocket);
-      log(webSocket, e.getMessage());
+    webSocket.close();
-      webSocket.close();
-    }
-    logger.exception(e);
   }
 
   @Override
   public void onStart() {
-    logger.success("Websocket server started on port " + this.getPort());
+    System.out.println("Websocket server started on port " + this.getPort());
   }
 
   /**
@@ -152,42 +120,45 @@ public class SocketServer extends WebSocketServer {
    */
   public void sendMessage(WebSocket webSocket, String text) {
     try {
-      MessagePacket message = MessagePacket.create(text);
+      MessagePacket message = new MessagePacket();
+      message.message = text;
       webSocket.send(PacketContainer.serialize(message));
     } catch (Exception e) {
       System.err.println("Failed to send message: " + text);
-      logger.exception(e);
+      log.error("e: ", e);
     }
   }
 
   /**
    * A shorthand method for sending error messages to the client
    */
-  public void sendError(WebSocket webSocket, String text, boolean isFatal) {
+  public void sendError(WebSocket webSocket, String text) {
     try {
-      ErrorPacket error = ErrorPacket.create(text, isFatal);
+      ErrorPacket error = new ErrorPacket();
+      error.error = text;
       webSocket.send(PacketContainer.serialize(error));
     } catch (Exception e) {
-      logger.exception(e);
+      System.err.println("Failed to send error: " + text);
-      log(webSocket, "Failed to send error: " + text);
+      log.error("e: ", e);
     }
   }
 
   /**
-   * The server-side implementation on how to handle certain packets when received
+   *  The server-side implementation on how to handle certain packets when received
    */
   private void onPacketReceived(WebSocket webSocket, IPacket packet) throws JsonProcessingException {
     SocketData socketData = webSocket.getAttachment();
 
-    // limit the number of tasks per connection
+    // limit the amount of tasks per connection
-    if (socketData.totalTasks.get() >= maxTasksPerSession) {
+    final int maxTasks = 100;
-      sendError(webSocket, "Exceeded the maximum amount of " + maxTasksPerSession + " tasks per session", true);
+    if (socketData.totalTasks.get() >= maxTasks) {
+      sendError(webSocket, "Exceeded the maximum amount of " + maxTasks + " tasks per session");
       webSocket.close();
       return;
     }
 
-    // only allow packets that are meant to be handled by the server
+    // only allow packets, that are meant to be handled by the server
-    if (!(packet instanceof IClientToServerPacket<?> clientToServerPacket)) {
+    if (!(packet instanceof IClientToServerPacket clientToServerPacket)) {
       sendMessage(webSocket, "The package of type " + packet.getClass().getName() + " is not handled by the server!");
       return;
     }
@@ -196,24 +167,22 @@ public class SocketServer extends WebSocketServer {
     socketData.unhandledTasks.incrementAndGet();
     socketData.totalTasks.incrementAndGet();
 
-    // add the packet to the queue so it can be started by the worker
+    // add the packet to the queue, so it can be started by the worker
     CompletableFuture.runAsync(() -> {
       clientToServerPacket.onHandle(webSocket, this);
-      int remainingUnhandledTasks = socketData.unhandledTasks.decrementAndGet();
 
-      if (socketData.closeIfNoTasksLeft) {
+      // if the websocket has 0 unhandled Tasks, close the connection
-        // if the websocket has 0 unhandled Tasks, close the connection
+      int remainingUnhandledTasks = socketData.unhandledTasks.decrementAndGet();
-        if (remainingUnhandledTasks <= 0) {
+      if (remainingUnhandledTasks <= 0) {
-          sendMessage(webSocket, "All requested tasks finished! Closing connection...");
+        sendMessage(webSocket, "All requested tasks finished! Closing connection...");
-          webSocket.close();
+        webSocket.close();
-        }
       }
-    }, taskExecutor);
+    });
   }
 
-  public void log(WebSocket webSocket, String msg) {
+  public void log(String msg, WebSocket webSocket) {
-    String socketId = (webSocket == null) ? "???" : webSocket.<SocketData>getAttachment().id;
+    SocketData socketData = webSocket == null ? new SocketData("???") : webSocket.getAttachment();
-    logger.info("[" + socketId + "] " + msg);
+    System.out.println("["+socketData.id+"] " + msg);
   }
 
   /**
@@ -225,11 +194,10 @@ public class SocketServer extends WebSocketServer {
     public final String id;
     public final AtomicInteger unhandledTasks = new AtomicInteger(0);
     public final AtomicInteger totalTasks = new AtomicInteger(0);
-    public boolean closeIfNoTasksLeft = false;
 
-    public SocketData(WebSocket webSocket) {
+    public SocketData(String id) {
-      this.id = UUID.randomUUID().toString();
+      this.id = id;
-      webSocket.setAttachment(this);
     }
   }
+
 }

src/main/java/de/dhbwstuttgart/server/packet/DebugPacket.java

@@ -2,7 +2,6 @@ package de.dhbwstuttgart.server.packet;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import de.dhbwstuttgart.server.SocketClient;
-import de.dhbwstuttgart.server.SocketFuture;
 import de.dhbwstuttgart.server.SocketServer;
 import de.dhbwstuttgart.server.packet.dataContainers.serialized.ISerialNode;
 import de.dhbwstuttgart.server.packet.dataContainers.serialized.SerialList;
@@ -11,7 +10,7 @@ import de.dhbwstuttgart.server.packet.dataContainers.serialized.SerialUUID;
 import de.dhbwstuttgart.server.packet.dataContainers.serialized.SerialValue;
 import org.java_websocket.WebSocket;
 
-public class DebugPacket implements IClientToServerPacket.Void, IServerToClientPacket {
+public class DebugPacket implements IClientToServerPacket, IServerToClientPacket {
 
   public SerialUUID a1;
   public SerialUUID a2;
@@ -23,13 +22,9 @@ public class DebugPacket implements IClientToServerPacket.Void, IServerToClientP
   public SerialValue<?> d2;
 
   @JsonIgnore
-  public void onHandle(WebSocket webSocket, SocketClient socketClient) {}
+  public void onHandle(WebSocket webSocket, SocketClient socketServer) {}
 
   @JsonIgnore
   public void onHandle(WebSocket webSocket, SocketServer socketServer) {}
 
-  @JsonIgnore
-  public SocketFuture<IServerToClientPacket> getFuture() {
-    return SocketFuture.completedFuture();
-  }
 }

src/main/java/de/dhbwstuttgart/server/packet/ErrorPacket.java

@@ -2,17 +2,16 @@ package de.dhbwstuttgart.server.packet;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import de.dhbwstuttgart.server.SocketClient;
-import de.dhbwstuttgart.server.SocketFuture;
 import de.dhbwstuttgart.server.SocketServer;
 import org.java_websocket.WebSocket;
 
 /**
  * A packet to send simple error messages between the client and the server
  */
-public class ErrorPacket implements IServerToClientPacket {
+public class ErrorPacket implements IClientToServerPacket, IServerToClientPacket {
 
   /**
-   * The error endpoint for messages from the server that should be logged out as errors and possibly abort the process
+   * The error endpoint for messages from the server, that should be logged out outputted
    */
   public String error;
   public boolean isFatal;
@@ -28,9 +27,15 @@ public class ErrorPacket implements IServerToClientPacket {
 
   @JsonIgnore
   public void onHandle(WebSocket webSocket, SocketClient socketClient) {
-    SocketClient.logger.exception(new RuntimeException(this.error));
+    System.err.println("[socket] " + "ErrorPacket: " + this.error);
     if (this.isFatal) {
-      socketClient.close(1, "Received fatal error from server");
+      throw new RuntimeException("Received fatal error from server: " + this.error);
     }
   }
+
+  @JsonIgnore
+  public void onHandle(WebSocket webSocket, SocketServer socketServer) {
+    socketServer.log("ErrorPacket: " + this.error, webSocket);
+  }
+
 }

src/main/java/de/dhbwstuttgart/server/packet/IClientToServerPacket.java

@@ -1,26 +1,12 @@
 package de.dhbwstuttgart.server.packet;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
-import de.dhbwstuttgart.server.SocketFuture;
 import de.dhbwstuttgart.server.SocketServer;
 import org.java_websocket.WebSocket;
 
-/**
+public interface IClientToServerPacket extends IPacket {
- * A packet that will be sent to the server. Use <code>Void</code> Sub-Interface for packets without response
- *
- * @param <T>   The response packet that will fulfill the future.
- */
-public interface IClientToServerPacket<T extends IServerToClientPacket> extends IPacket {
 
   @JsonIgnore
   void onHandle(WebSocket webSocket, SocketServer socketServer);
 
-  @JsonIgnore
-  SocketFuture<T> getFuture();
-
-  /**
-   * Special case, where the packet will remain unanswered by the server
-   */
-  interface Void extends IClientToServerPacket<IServerToClientPacket> {}
 }
-

src/main/java/de/dhbwstuttgart/server/packet/InvalidPacket.java

@@ -2,14 +2,13 @@ package de.dhbwstuttgart.server.packet;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import de.dhbwstuttgart.server.SocketClient;
-import de.dhbwstuttgart.server.SocketFuture;
 import de.dhbwstuttgart.server.SocketServer;
 import org.java_websocket.WebSocket;
 
 /**
- * A fallback packet that is generated if the received JSON could not be mapped to an existing package
+ * A fallback packet that is generated, if the received json could not be mapped to an existing package
  */
-public class InvalidPacket implements IClientToServerPacket.Void, IServerToClientPacket {
+public class InvalidPacket implements IClientToServerPacket, IServerToClientPacket {
 
   /**
    * If available, the error that caused this package to appear
@@ -19,17 +18,12 @@ public class InvalidPacket implements IClientToServerPacket.Void, IServerToClien
 
   @JsonIgnore
   public void onHandle(WebSocket webSocket, SocketClient socketClient) {
-    SocketClient.logger.error("InvalidPacket: " + this.error);
+    System.err.println("[socket] " + "InvalidPacket: " + this.error);
   }
 
   @JsonIgnore
   public void onHandle(WebSocket webSocket, SocketServer socketServer) {
-    socketServer.log(webSocket, "InvalidPacket: " + this.error);
+    socketServer.log("InvalidPacket: " + this.error, webSocket);
-  }
-
-  @JsonIgnore
-  public SocketFuture<IServerToClientPacket> getFuture() {
-    return SocketFuture.completedFuture();
   }
 
 }

src/main/java/de/dhbwstuttgart/server/packet/MessagePacket.java

@@ -2,17 +2,16 @@ package de.dhbwstuttgart.server.packet;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import de.dhbwstuttgart.server.SocketClient;
-import de.dhbwstuttgart.server.SocketFuture;
 import de.dhbwstuttgart.server.SocketServer;
 import org.java_websocket.WebSocket;
 
 /**
  * A packet to send simple informational messages between the client and the server
  */
-public class MessagePacket implements IClientToServerPacket.Void, IServerToClientPacket {
+public class MessagePacket implements IClientToServerPacket, IServerToClientPacket {
 
   /**
-   * The informational message from the server that should be logged out outputted
+   * The informational message from the server, that should be logged out outputted
    */
   public String message;
 
@@ -25,16 +24,13 @@ public class MessagePacket implements IClientToServerPacket.Void, IServerToClien
 
   @JsonIgnore
   public void onHandle(WebSocket webSocket, SocketClient socketClient) {
-    SocketClient.logger.info("SocketMessage: " + this.message);
+    System.err.println("[socket] " + this.message);
+
   }
 
   @JsonIgnore
   public void onHandle(WebSocket webSocket, SocketServer socketServer) {
-    socketServer.log(webSocket, this.message);
+    socketServer.log(this.message, webSocket);
   }
 
-  @JsonIgnore
-  public SocketFuture<IServerToClientPacket> getFuture() {
-    return SocketFuture.completedFuture();
-  }
 }

src/main/java/de/dhbwstuttgart/server/packet/PacketContainer.java

@@ -3,7 +3,6 @@ package de.dhbwstuttgart.server.packet;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import de.dhbwstuttgart.util.Logger;
 
 /**
  * A wrapper for the packet to ensure correct serialization/deserialization and make it possible to detect the matching
@@ -25,14 +24,13 @@ public class PacketContainer {
   public UnifyRequestPacket unifyRequestPacket = null;
   public UnifyResultPacket unifyResultPacket = null;
   public DebugPacket debugPacket = null;
-  public SetAutoclosePacket setAutoclosePacket = null;
 
 
   /**
    * Generate the JSON string for the given packet
    *
    * @param packet The packet to serialize
-   * @return The JSON representation of the packet
+   * @return The json representation of the packet
    */
   public static String serialize(IPacket packet) throws JsonProcessingException {
     objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
@@ -48,11 +46,7 @@ public class PacketContainer {
       container.unifyResultPacket = (UnifyResultPacket) packet;
     else if (packet instanceof DebugPacket)
       container.debugPacket = (DebugPacket) packet;
-    else if (packet instanceof SetAutoclosePacket)
-      container.setAutoclosePacket = (SetAutoclosePacket) packet;
     // Add new packets here and in the deserialize method
-    else
-      throw new RuntimeException("Cannot map packet to any known packet class");
 
     return objectMapper.writeValueAsString(container);
   }
@@ -81,13 +75,11 @@ public class PacketContainer {
         return container.unifyResultPacket;
       if (container.debugPacket != null)
         return container.debugPacket;
-      if (container.setAutoclosePacket != null)
-        return container.setAutoclosePacket;
       // Add new packets here and in the serialize method
 
       throw new RuntimeException("Cannot map received json to any known packet class");
     } catch (Exception e) {
-      (new Logger()).exception(e);
+      System.out.println(e);
       InvalidPacket packet = new InvalidPacket();
       packet.error = e.getMessage();
       return packet;

src/main/java/de/dhbwstuttgart/server/packet/SetAutoclosePacket.java

@@ -1,32 +0,0 @@
-package de.dhbwstuttgart.server.packet;
-
-import com.fasterxml.jackson.annotation.JsonIgnore;
-import de.dhbwstuttgart.server.SocketClient;
-import de.dhbwstuttgart.server.SocketFuture;
-import de.dhbwstuttgart.server.SocketServer;
-import org.java_websocket.WebSocket;
-
-/**
- * Normally, a connection stays open until either the client or the server process ends.
- * Send this packet to inform the server that the connection can be closed once all tasks are done
- */
-public class SetAutoclosePacket implements IClientToServerPacket.Void {
-
-  public int dummyProperty = 1;
-
-  @JsonIgnore
-  public static SetAutoclosePacket create() {
-    return new SetAutoclosePacket();
-  }
-
-  @JsonIgnore
-  public void onHandle(WebSocket webSocket, SocketServer socketServer) {
-    webSocket.<SocketServer.SocketData>getAttachment().closeIfNoTasksLeft = true;
-    socketServer.log(webSocket, "Marked connection as autoclose");
-  }
-
-  @JsonIgnore
-  public SocketFuture<IServerToClientPacket> getFuture() {
-    return SocketFuture.completedFuture();
-  }
-}

src/main/java/de/dhbwstuttgart/server/packet/UnifyRequestPacket.java

@@ -1,9 +1,6 @@
 package de.dhbwstuttgart.server.packet;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
-import de.dhbwstuttgart.core.ConsoleInterface;
-import de.dhbwstuttgart.server.ServerTaskLogger;
-import de.dhbwstuttgart.server.SocketFuture;
 import de.dhbwstuttgart.server.SocketServer;
 import de.dhbwstuttgart.server.packet.dataContainers.KeyStorage;
 import de.dhbwstuttgart.server.packet.dataContainers.serialized.SerialList;
@@ -22,17 +19,18 @@ import de.dhbwstuttgart.typeinference.unify.model.FiniteClosure;
 import de.dhbwstuttgart.typeinference.unify.model.PlaceholderType;
 import de.dhbwstuttgart.typeinference.unify.model.UnifyPair;
 import de.dhbwstuttgart.typeinference.unify.model.UnifyType;
-import de.dhbwstuttgart.util.Logger;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.Writer;
 import java.util.ArrayList;
 import java.util.HashSet;
-import java.util.List;
 import java.util.concurrent.ForkJoinPool;
 import org.java_websocket.WebSocket;
 
 /**
  * A packet to send all required data for the unification algorithm to the server and request the unification
  */
-public class UnifyRequestPacket implements IClientToServerPacket<UnifyResultPacket> {
+public class UnifyRequestPacket implements IClientToServerPacket {
 
   public SerialMap finiteClosure;
   public SerialMap constraintSet;
@@ -40,33 +38,30 @@ public class UnifyRequestPacket implements IClientToServerPacket<UnifyResultPack
   public SerialMap serialKeyStorage;
   public SerialValue<?> placeholders;
   public SerialList<SerialMap> factoryplaceholders;
-  public String futureId;
-  public int logLevel;
 
   @JsonIgnore
   private KeyStorage keyStorage = new KeyStorage();
   @JsonIgnore
   private boolean keyStorageLoaded = false;
 
-  public static UnifyRequestPacket create(
+  public UnifyRequestPacket() {}
+
+  public UnifyRequestPacket(
     FiniteClosure finiteClosure,
     ConstraintSet<Pair> constraintSet,
     ConstraintSet<UnifyPair> unifyConstraintSet,
     PlaceholderRegistry placeholderRegistry
   ) {
-    UnifyRequestPacket packet = new UnifyRequestPacket();
+    // store contraint and finite closure
-    // store constraint and finite closure
+    this.finiteClosure = finiteClosure.toSerial(keyStorage);
-    packet.finiteClosure = finiteClosure.toSerial(packet.keyStorage);
+    this.constraintSet = constraintSet.toSerial(keyStorage);
-    packet.constraintSet = constraintSet.toSerial(packet.keyStorage);
+    this.unifyConstraintSet = unifyConstraintSet.toSerial(keyStorage);
-    packet.unifyConstraintSet = unifyConstraintSet.toSerial(packet.keyStorage);
     // store placeholder registry
-    var serialRegistry = placeholderRegistry.toSerial(packet.keyStorage);
+    var serialRegistry = placeholderRegistry.toSerial(keyStorage);
-    packet.placeholders = serialRegistry.getValue("ph");
+    this.placeholders = serialRegistry.getValue("ph");
-    packet.factoryplaceholders = serialRegistry.getList("factoryPh").assertListOfMaps();
+    this.factoryplaceholders = serialRegistry.getList("factoryPh").assertListOfMaps();
     // store referenced objects separately
-    packet.serialKeyStorage = packet.keyStorage.toSerial(packet.keyStorage);
+    this.serialKeyStorage = keyStorage.toSerial(keyStorage);
-    packet.logLevel = ConsoleInterface.logLevel.getValue();
-    return packet;
   }
 
 
@@ -99,22 +94,15 @@ public class UnifyRequestPacket implements IClientToServerPacket<UnifyResultPack
   @JsonIgnore
   public void onHandle(WebSocket webSocket, SocketServer socketServer) {
     socketServer.sendMessage(webSocket, "You requested a unify! Please wait until I calculated everything...");
-    socketServer.log(webSocket, "Client requested a unification. Starting now...");
+    System.out.println("Client " + webSocket.<SocketServer.SocketData>getAttachment().id + " requested a unification. Starting now...");
 
     try {
       var placeholderRegistry = new PlaceholderRegistry();
       ArrayList<String> existingPlaceholders = (ArrayList) this.placeholders.getOf(ArrayList.class);
       existingPlaceholders.forEach(placeholderRegistry::addPlaceholder);
 
-      Logger logger = new ServerTaskLogger(
+      var unifyContext = new UnifyContext(Writer.nullWriter(), false, true,
-        webSocket,
+        new UnifyResultModel(new ConstraintSet<>(), new FiniteClosure(new HashSet<>(), null, placeholderRegistry)),
-        socketServer,
-        Logger.LogLevel.fromValue(
-          Math.max(this.logLevel, Logger.LogLevel.INFO.getValue())
-        )
-      );
-      var unifyContext = new UnifyContext(logger, true,
-        new UnifyResultModel(new ConstraintSet<>(), new FiniteClosure(new HashSet<>(), logger, placeholderRegistry)),
         new UnifyTaskModel(), ForkJoinPool.commonPool(), placeholderRegistry
       );
 
@@ -141,24 +129,17 @@ public class UnifyRequestPacket implements IClientToServerPacket<UnifyResultPack
 
       var resultSets = resultListener.getResults();
 
-      socketServer.log(webSocket, "Finished unification");
+      System.out.println("Finished unification for client " + webSocket.<SocketServer.SocketData>getAttachment().id);
       socketServer.sendMessage(webSocket, "Unification finished. Found " + resultSets.size() + " result sets");
 
       if (webSocket.isOpen()) {
-        UnifyResultPacket resultPacket = UnifyResultPacket.create(resultSets, futureId);
+        UnifyResultPacket resultPacket = UnifyResultPacket.create(resultSets);
         webSocket.send(PacketContainer.serialize(resultPacket));
       }
     } catch (Exception e) {
-      SocketServer.logger.exception(e);
+      System.err.println(e);
-      socketServer.log(webSocket, e.getMessage());
+      SocketServer.log.error("e: ", e);
     }
   }
 
-  @JsonIgnore
-  public SocketFuture<UnifyResultPacket> getFuture() {
-    var future = new SocketFuture<>(List.of(UnifyResultPacket.class));
-    futureId = future.futureId;
-    return future;
-  }
-
 }

src/main/java/de/dhbwstuttgart/server/packet/UnifyResultPacket.java

@@ -18,14 +18,12 @@ public class UnifyResultPacket implements IServerToClientPacket {
 
   public SerialList<ISerialNode> results;
   public SerialMap keyStorage;
-  public String futureId;
 
-  public static UnifyResultPacket create(List<ResultSet> resultSets, String futureId) {
+  public static UnifyResultPacket create(List<ResultSet> resultSets) {
     UnifyResultPacket serialized = new UnifyResultPacket();
     KeyStorage keyStorage = new KeyStorage();
     serialized.results = SerialList.fromMapped(resultSets, resultSet -> resultSet.toSerial(keyStorage));
     serialized.keyStorage = keyStorage.toSerial(keyStorage);
-    serialized.futureId = futureId;
     return serialized;
   }
 
@@ -37,8 +35,8 @@ public class UnifyResultPacket implements IServerToClientPacket {
 
   @JsonIgnore
   public void onHandle(WebSocket webSocket, SocketClient socketClient) {
-    SocketClient.logger.info("Received unify result");
+    System.out.println("[socket] Received unify result");
-    socketClient.completeResponseFuture(futureId, this);
+    socketClient.setUnifyResultSets(this);
   }
 
 

src/main/java/de/dhbwstuttgart/server/packet/dataContainers/serialized/SerialMap.java

@@ -3,7 +3,7 @@ package de.dhbwstuttgart.server.packet.dataContainers.serialized;
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import java.util.HashMap;
 import java.util.Map;
-import org.jspecify.annotations.Nullable;
+import javax.annotation.Nullable;
 
 public class SerialMap extends HashMap<String, ISerialNode> implements ISerialNode {
 

src/main/java/de/dhbwstuttgart/syntaxtree/SyntaxTree.java

@@ -1,8 +0,0 @@
-package de.dhbwstuttgart.syntaxtree;
-
-import de.dhbwstuttgart.util.Logger;
-
-public class SyntaxTree {
-
-  public static Logger logger = new Logger("SyntaxTree");
-}

src/main/java/de/dhbwstuttgart/syntaxtree/factory/UnifyTypeFactory.java

@@ -1,8 +1,6 @@
 package de.dhbwstuttgart.syntaxtree.factory;
 
-import de.dhbwstuttgart.syntaxtree.SyntaxTree;
 import de.dhbwstuttgart.typeinference.unify.PlaceholderRegistry;
-import de.dhbwstuttgart.util.Logger;
 import java.io.Writer;
 import java.lang.reflect.Modifier;
 import java.util.*;
@@ -36,7 +34,7 @@ public class UnifyTypeFactory {
 	
     public static FiniteClosure generateFC(
       List<ClassOrInterface> fromClasses,
-      Logger logger,
+      Writer logFile,
       ClassLoader classLoader,
       JavaTXCompiler compiler,
       PlaceholderRegistry placeholderRegistry
@@ -51,7 +49,7 @@ public class UnifyTypeFactory {
         Generell dürfen sie immer die gleichen Namen haben.
         TODO: die transitive Hülle bilden
          */
-        return new FiniteClosure(FCGenerator.toUnifyFC(compiler, fromClasses, classLoader, placeholderRegistry), logger, compiler, placeholderRegistry);
+        return new FiniteClosure(FCGenerator.toUnifyFC(compiler, fromClasses, classLoader, placeholderRegistry), logFile, compiler, placeholderRegistry);
     }
 
     public static UnifyPair generateSmallerPair(UnifyType tl, UnifyType tr, SourceLoc location){
@@ -134,7 +132,7 @@ public class UnifyTypeFactory {
 
     public static UnifyType convert(JavaTXCompiler compiler, TypePlaceholder tph, Boolean innerType, PlaceholderRegistry placeholderRegistry) {
     	if (tph.getName().equals("AFR")) {
-          SyntaxTree.logger.info("XXX"+innerType);
+    		System.out.println("XXX"+innerType);
     	}
     	PlaceholderType ntph = new PlaceholderType(tph.getName(), tph.getVariance(), placeholderRegistry);
     	ntph.setVariance(tph.getVariance());
@@ -201,7 +199,7 @@ public class UnifyTypeFactory {
         		&& ((PlaceholderType)lhs).isWildcardable() 
         		&&	(rhs = ret.getLhsType()) instanceof PlaceholderType) {
         	if (lhs.getName().equals("AQ")) {
-        		// SyntaxTree.logger.info("");
+        		// System.out.println("");
         	}
         	((PlaceholderType)rhs).enableWildcardtable();
         }
@@ -210,7 +208,7 @@ public class UnifyTypeFactory {
         		&& ((PlaceholderType)rhs).isWildcardable()
         		&&	(lhs = ret.getLhsType()) instanceof PlaceholderType) {
         	if (rhs.getName().equals("AQ")) {
-        		// SyntaxTree.logger.info("");
+        		// System.out.println("");
         	}
         	((PlaceholderType)lhs).enableWildcardtable();
         }

src/main/java/de/dhbwstuttgart/target/Target.java

@@ -1,8 +0,0 @@
-package de.dhbwstuttgart.target;
-
-import de.dhbwstuttgart.util.Logger;
-
-public class Target {
-  public static Logger logger = new Logger("Target");
-
-}

src/main/java/de/dhbwstuttgart/target/generate/ASTToTargetAST.java

@@ -2,6 +2,7 @@ package de.dhbwstuttgart.target.generate;
 
 import de.dhbwstuttgart.bytecode.FunNGenerator;
 import de.dhbwstuttgart.core.JavaTXCompiler;
+import de.dhbwstuttgart.environment.ByteArrayClassLoader;
 import de.dhbwstuttgart.environment.IByteArrayClassLoader;
 import de.dhbwstuttgart.exceptions.DebugException;
 import de.dhbwstuttgart.parser.NullToken;
@@ -11,9 +12,6 @@ import de.dhbwstuttgart.syntaxtree.Record;
 import de.dhbwstuttgart.syntaxtree.factory.ASTFactory;
 import de.dhbwstuttgart.syntaxtree.statement.*;
 import de.dhbwstuttgart.syntaxtree.type.*;
-import de.dhbwstuttgart.syntaxtree.visual.ASTPrinter;
-import de.dhbwstuttgart.syntaxtree.visual.OutputGenerator;
-import de.dhbwstuttgart.target.Target;
 import de.dhbwstuttgart.target.tree.*;
 import de.dhbwstuttgart.target.tree.expression.*;
 import de.dhbwstuttgart.target.tree.type.*;
@@ -68,11 +66,11 @@ public class ASTToTargetAST {
     public IByteArrayClassLoader classLoader;
     protected SourceFile sourceFile;
 
-    public ASTToTargetAST(List<ResultSet> resultSets, IByteArrayClassLoader classLoader) {
+    public ASTToTargetAST(List<ResultSet> resultSets) {
-        this(null, resultSets, classLoader);
+        this(null, resultSets);
     }
-    public ASTToTargetAST(JavaTXCompiler compiler, List<ResultSet> resultSets, IByteArrayClassLoader classLoader) {
+    public ASTToTargetAST(JavaTXCompiler compiler, List<ResultSet> resultSets) {
-        this(compiler, resultSets, null, classLoader);
+        this(compiler, resultSets, null, new ByteArrayClassLoader());
     }
 
     public ASTToTargetAST(JavaTXCompiler compiler, List<ResultSet> resultSets, SourceFile sourceFile, IByteArrayClassLoader classLoader) {
@@ -339,10 +337,10 @@ public class ASTToTargetAST {
 
         var result = r0.stream().map(l -> l.stream().toList()).toList();
 
-        Target.logger.info("============== OUTPUT ==============");
+        System.out.println("============== OUTPUT ==============");
         for (var l : result) {
-            for (var m : l) Target.logger.info(m.name() + " " + m.getSignature());
+            for (var m : l) System.out.println(m.name() + " " + m.getSignature());
-            Target.logger.info("");
+            System.out.println();
         }
         return result;
     }
@@ -783,15 +781,7 @@ public class ASTToTargetAST {
         return TargetFunNType.fromParams(params, filteredParams, gep.getReturnType() != null ? 1 : 0);
     }
 
-    private FunNGenerator.GenericParameters convertToParameters(TargetFunNType input) {
-        return null;
-    }
-
     private boolean isSubtype(TargetType test, TargetType other) {
-        if (other.equals(TargetType.Object)) return true;
-        if (test instanceof TargetFunNType tfun && other instanceof TargetFunNType ofun)
-            return isSubtype(new FunNGenerator.GenericParameters(tfun), new FunNGenerator.GenericParameters(ofun));
-
         var testClass = compiler.getClass(new JavaClassName(test.name()));
         var otherClass = compiler.getClass(new JavaClassName(other.name()));
         if (testClass == null) return false;
@@ -828,6 +818,14 @@ public class ASTToTargetAST {
                 .toList();
 
             var code = FunNGenerator.generateSpecializedBytecode(gep, superInterfaces);
+
+            try {
+                classLoader.findClass(entry.getKey());
+            } catch (ClassNotFoundException e) {
+                try {
+                    classLoader.loadClass(code);
+                } catch (LinkageError ignored) {}
+            }
             auxiliaries.put(entry.getKey(), code);
         }
     }
@@ -858,7 +856,7 @@ public class ASTToTargetAST {
                             classLoader.findClass(superClassName);
                         } catch (ClassNotFoundException e) {
                             try {
-                                classLoader.loadClass(superClassName, code);
+                                classLoader.loadClass(code);
                             } catch (LinkageError ignored) {}
                         }
                         auxiliaries.put(superClassName, code);

src/main/java/de/dhbwstuttgart/target/generate/GenerateGenerics.java

@@ -1,12 +1,10 @@
 package de.dhbwstuttgart.target.generate;
 
-import de.dhbwstuttgart.core.JavaTXCompiler;
 import de.dhbwstuttgart.parser.NullToken;
 import de.dhbwstuttgart.syntaxtree.*;
 import de.dhbwstuttgart.syntaxtree.statement.*;
 import de.dhbwstuttgart.syntaxtree.type.*;
 import de.dhbwstuttgart.syntaxtree.type.Void;
-import de.dhbwstuttgart.target.Target;
 import de.dhbwstuttgart.target.tree.type.TargetGenericType;
 import de.dhbwstuttgart.target.tree.type.TargetType;
 import de.dhbwstuttgart.typeinference.result.PairTPHEqualTPH;
@@ -140,17 +138,17 @@ public abstract class GenerateGenerics {
         this.astToTargetAST = astToTargetAST;
         for (var constraint : constraints.results) {
             if (constraint instanceof PairTPHsmallerTPH p) {
-                Target.logger.info(p.left + " " + p.left.getVariance());
+                System.out.println(p.left + " " + p.left.getVariance());
                 simplifiedConstraints.add(new PairLT(new TPH(p.left), new TPH(p.right)));
             } else if (constraint instanceof PairTPHEqualTPH p) {
                 equality.put(p.getLeft(), p.getRight());
             } else if (constraint instanceof PairTPHequalRefTypeOrWildcardType p) {
-                Target.logger.info(p.left + " = " + p.right);
+                System.out.println(p.left + " = " + p.right);
                 concreteTypes.put(new TPH(p.left), p.right);
             }
         }
 
-        Target.logger.info("Simplified constraints: " + simplifiedConstraints);
+        System.out.println("Simplified constraints: " + simplifiedConstraints);
     }
 
     /*public record GenericsState(Map<TPH, RefTypeOrTPHOrWildcardOrGeneric> concreteTypes, Map<TypePlaceholder, TypePlaceholder> equality) {}
@@ -250,7 +248,7 @@ public abstract class GenerateGenerics {
                 equality.put(entry.getKey(), to);
             }
         }
-        Target.logger.info(from + " -> " + to + " " + from.getVariance());
+        System.out.println(from + " -> " + to + " " + from.getVariance());
         //from.setVariance(to.getVariance());
         equality.put(from, to);
         referenced.remove(new TPH(from));
@@ -319,7 +317,7 @@ public abstract class GenerateGenerics {
                     Set<TPH> T2s = new HashSet<>();
                     findTphs(superType, T2s);
 
-                    Target.logger.info("T1s: " + T1s + " T2s: " + T2s);
+                    System.out.println("T1s: " + T1s + " T2s: " + T2s);
                     //Ende
 
                     superType = methodCall.receiverType;
@@ -334,7 +332,7 @@ public abstract class GenerateGenerics {
                             var optMethod = astToTargetAST.findMethod(owner, methodCall.name, methodCall.signatureArguments().stream().map(astToTargetAST::convert).toList());
                             if (optMethod.isEmpty()) return;
                             var method2 = optMethod.get();
-                            Target.logger.info("In: " + method.getName() + " Method: " + method2.getName());
+                            System.out.println("In: " + method.getName() + " Method: " + method2.getName());
                             var generics = family(owner, method2);
 
                             // transitive and
@@ -367,7 +365,7 @@ public abstract class GenerateGenerics {
                                                     if (!T1s.contains(R1) || !T2s.contains(R2)) continue;
 
                                                     var newPair = new PairLT(R1, R2);
-                                                    Target.logger.info("New pair: " + newPair);
+                                                    System.out.println("New pair: " + newPair);
                                                     newPairs.add(newPair);
 
                                                     if (!containsRelation(result, newPair))
@@ -569,7 +567,7 @@ public abstract class GenerateGenerics {
     Set<Pair> generics(ClassOrInterface owner, Method method) {
         if (computedGenericsOfMethods.containsKey(method)) {
             var cached = computedGenericsOfMethods.get(method);
-            Target.logger.info("Cached " + method.getName() + ": " + cached);
+            System.out.println("Cached " + method.getName() + ": " + cached);
             return cached;
         }
 
@@ -598,7 +596,7 @@ public abstract class GenerateGenerics {
 
         normalize(result, classGenerics, usedTphs);
 
-        Target.logger.info(this.getClass().getSimpleName() + " " + method.name + ": " + result);
+        System.out.println(this.getClass().getSimpleName() + " " + method.name + ": " + result);
         return result;
     }
 
@@ -677,7 +675,7 @@ public abstract class GenerateGenerics {
 
         normalize(javaResult, null, referencedByClass);
 
-        Target.logger.info(this.getClass().getSimpleName() + " Class " + classOrInterface.getClassName().getClassName() + ": " + javaResult);
+        System.out.println(this.getClass().getSimpleName() + " Class " + classOrInterface.getClassName().getClassName() + ": " + javaResult);
         return javaResult;
     }
 
@@ -728,7 +726,7 @@ public abstract class GenerateGenerics {
                     if (!added) break;
                 }
 
-                Target.logger.info(chain + " " + chain.stream().map(e -> e.resolve().getVariance()).toList());
+                System.out.println(chain + " " + chain.stream().map(e -> e.resolve().getVariance()).toList());
                 var variance = chain.get(0).resolve().getVariance();
                 if (variance != 1) continue;
                 var index = 0;
@@ -766,7 +764,7 @@ public abstract class GenerateGenerics {
         }
 
         for (var pair : elementsToAddToEquality) {
-            Target.logger.info(pair);
+            System.out.println(pair);
             addToEquality(pair.left, pair.right, referenced);
         }
     }
@@ -919,11 +917,11 @@ public abstract class GenerateGenerics {
                     }
                 }
                 if (infima.size() > 1) {
-                    Target.logger.info(infima);
+                    System.out.println(infima);
                     for (var pair : infima) {
                         var returnTypes = findTypeVariables(method.getReturnType());
                         var chain = findConnectionToReturnType(returnTypes, input, new HashSet<>(), pair.left);
-                        Target.logger.info("Find: " + pair.left + " " + chain);
+                        System.out.println("Find: " + pair.left + " " + chain);
                         chain.remove(pair.left);
                         if (chain.size() > 0) {
                             for (var tph : chain)
@@ -961,8 +959,8 @@ public abstract class GenerateGenerics {
                         }
                     }
                     newTph.setVariance(variance);
-                    Target.logger.info(infima + " " + infima.stream().map(i -> i.right.resolve().getVariance()).toList());
+                    System.out.println(infima + " " + infima.stream().map(i -> i.right.resolve().getVariance()).toList());
-                    Target.logger.info("Infima new TPH " + newTph + " variance " + variance);
+                    System.out.println("Infima new TPH " + newTph + " variance " + variance);
 
                     //referenced.add(newTph);
                     addToPairs(input, new PairLT(left, new TPH(newTph)));

src/main/java/de/dhbwstuttgart/target/generate/StatementToTargetExpression.java

@@ -8,14 +8,12 @@ import de.dhbwstuttgart.parser.scope.JavaClassName;
 import de.dhbwstuttgart.syntaxtree.*;
 import de.dhbwstuttgart.syntaxtree.statement.*;
 import de.dhbwstuttgart.syntaxtree.type.*;
-import de.dhbwstuttgart.target.Target;
 import de.dhbwstuttgart.target.tree.MethodParameter;
 import de.dhbwstuttgart.target.tree.TargetMethod;
 import de.dhbwstuttgart.target.tree.expression.*;
 import de.dhbwstuttgart.target.tree.type.*;
 
 import java.lang.reflect.Modifier;
-import java.sql.Array;
 import java.util.*;
 import java.util.stream.Collectors;
 import java.util.stream.StreamSupport;
@@ -34,71 +32,54 @@ public class StatementToTargetExpression implements ASTVisitor {
         throw new NotImplementedException();
     }
 
-    private class LambdaCaptureFinder extends TracingStatementVisitor {
-
-        // TODO The same mechanism is implemented in Codegen, maybe use it from there?
-        final Stack<Set<String>> localVariables = new Stack<>();
-        private final List<MethodParameter> parameters;
-        private final List<MethodParameter> captures;
-
-        LambdaCaptureFinder(List<MethodParameter> parameters, List<MethodParameter> captures) {
-            localVariables.push(new HashSet<>());
-            this.parameters = parameters;
-            this.captures = captures;
-        }
-
-        boolean hasLocalVar(String name) {
-            for (var localVariables : this.localVariables) {
-                if (localVariables.contains(name))
-                    return true;
-            }
-            return false;
-        }
-
-        @Override
-        public void visit(Block block) {
-            localVariables.push(new HashSet<>());
-            super.visit(block);
-            localVariables.pop();
-        }
-
-        @Override
-        public void visit(LocalVar localVar) {
-            super.visit(localVar);
-            var capture = new MethodParameter(new TargetTypePattern(converter.convert(localVar.getType()), localVar.name));
-            if (!hasLocalVar(localVar.name) && !parameters.contains(capture) && !captures.contains(capture))
-                captures.add(capture);
-        }
-
-        @Override
-        public void visit(LocalVarDecl varDecl) {
-            var localVariables = this.localVariables.peek();
-            localVariables.add(varDecl.getName());
-        }
-
-        @Override
-        public void visit(LambdaExpression lambda) {
-            var newCaptures = new ArrayList<MethodParameter>();
-            var captureFinder = new LambdaCaptureFinder(createParameters(lambda), newCaptures);
-            lambda.methodBody.accept(captureFinder);
-            newCaptures.removeAll(parameters);
-            captures.addAll(newCaptures);
-        }
-    }
-
-    private List<MethodParameter> createParameters(LambdaExpression lambda) {
-        return StreamSupport.stream(lambda.params.spliterator(), false)
-            .map(p -> (FormalParameter) p)
-            .map(p -> new MethodParameter(new TargetTypePattern(converter.convert(p.getType()), p.getName())))
-            .toList();
-    }
-
     @Override
     public void visit(LambdaExpression lambdaExpression) {
-        var parameters = createParameters(lambdaExpression);
+        var parameters = StreamSupport.stream(lambdaExpression.params.spliterator(), false)
+                .map(p -> (FormalParameter) p)
+                .map(p -> new MethodParameter(new TargetTypePattern(converter.convert(p.getType()), p.getName())))
+                .toList();
+
         List<MethodParameter> captures = new ArrayList<>();
-        var visitor = new LambdaCaptureFinder(parameters, captures);
+        lambdaExpression.methodBody.accept(new TracingStatementVisitor() {
-        lambdaExpression.methodBody.accept(visitor);
+            // TODO The same mechanism is implemented in Codegen, maybe use it from there?
+            final Stack<Set<String>> localVariables = new Stack<>();
+            {
+                localVariables.push(new HashSet<>());
+            }
+
+            boolean hasLocalVar(String name) {
+                for (var localVariables : this.localVariables) {
+                    if (localVariables.contains(name))
+                        return true;
+                }
+                return false;
+            }
+
+            @Override
+            public void visit(Block block) {
+                localVariables.push(new HashSet<>());
+                super.visit(block);
+                localVariables.pop();
+            }
+
+            @Override
+            public void visit(LocalVar localVar) {
+                super.visit(localVar);
+                var capture = new MethodParameter(new TargetTypePattern(converter.convert(localVar.getType()), localVar.name));
+                if (!hasLocalVar(localVar.name) && !parameters.contains(capture) && !captures.contains(capture))
+                    captures.add(capture);
+            }
+
+            @Override
+            public void visit(LocalVarDecl varDecl) {
+                var localVariables = this.localVariables.peek();
+                localVariables.add(varDecl.getName());
+            }
+
+            @Override
+            public void visit(LambdaExpression lambda) {
+            } // Don't look at lambda expressions
+        });
 
         TargetMethod.Signature signature = new TargetMethod.Signature(Set.of(), parameters, converter.convert(lambdaExpression.getReturnType()));;
         var tpe = converter.convert(lambdaExpression.getType());
@@ -139,10 +120,7 @@ public class StatementToTargetExpression implements ASTVisitor {
 
     @Override
     public void visit(BoolExpression bool) {
-        result = switch(bool.operation) {
+        System.out.println("BoolExpression");
-        case OR -> new TargetBinaryOp.Or(converter.convert(bool.getType()), converter.convert(bool.lexpr), converter.convert(bool.rexpr));
-        case AND -> new TargetBinaryOp.And(converter.convert(bool.getType()), converter.convert(bool.lexpr), converter.convert(bool.rexpr));
-        };
     }
 
     @Override
@@ -256,7 +234,7 @@ public class StatementToTargetExpression implements ASTVisitor {
             isInterface = receiverClass.isInterface();
         }
 
-        Target.logger.info(argList);
+        System.out.println(argList);
         result = new TargetMethodCall(converter.convert(methodCall.getType()), returnType, argList, converter.convert(methodCall.receiver), methodCall.getArgumentList().getArguments().stream().map(converter::convert).toList(), receiverType, methodCall.name, isStatic, isInterface, isPrivate);
     }
 

src/main/java/de/dhbwstuttgart/typeinference/assumptions/MethodAssumption.java

@@ -19,11 +19,11 @@ public class MethodAssumption extends Assumption{
     private ClassOrInterface receiver;
     private RefTypeOrTPHOrWildcardOrGeneric retType;
     List<? extends RefTypeOrTPHOrWildcardOrGeneric> params;
-    private final boolean isInherited;
+    private final Boolean isInherited;
-    private final boolean isOverridden;
+    private final Boolean isOverridden;
 
     public MethodAssumption(ClassOrInterface receiver, RefTypeOrTPHOrWildcardOrGeneric retType,
-                            List<? extends RefTypeOrTPHOrWildcardOrGeneric> params, TypeScope scope, boolean isInherited, boolean isOverridden){
+                            List<? extends RefTypeOrTPHOrWildcardOrGeneric> params, TypeScope scope, Boolean isInherited, Boolean isOverridden){
         super(scope);
         this.receiver = receiver;
         this.retType = retType;
@@ -73,11 +73,11 @@ public class MethodAssumption extends Assumption{
         return TYPEStmt.getReceiverType(receiver, resolver);
     }
     
-    public boolean isInherited() {
+    public Boolean isInherited() {
     	return isInherited;
     }
     
-    public boolean isOverridden() {
+    public Boolean isOverridden() {
     	return isOverridden;
     }
 }

src/main/java/de/dhbwstuttgart/typeinference/constraints/Constraint.java

@@ -9,97 +9,84 @@ import de.dhbwstuttgart.server.packet.dataContainers.serialized.SerialUUID;
 import de.dhbwstuttgart.typeinference.unify.UnifyContext;
 import de.dhbwstuttgart.typeinference.unify.model.UnifyPair;
 
+import java.util.ArrayList;
 import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
 import java.util.function.Function;
 import java.util.stream.Collectors;
+import javax.annotation.Nullable;
 
-public class Constraint<A extends IConstraintElement> extends HashSet<A> implements Comparable<Constraint<A>>, ISerializableData {
+public class Constraint<A extends IConstraintElement> extends HashSet<A> implements ISerializableData {
-	private static final long serialVersionUID = 1L;
+  private static final long serialVersionUID = 1L;
-	private boolean isInherited = false;//wird beides nur für die Method-Constraints benoetigt
+  private Boolean isInherited = false;//wird beides nur für die Method-Constraints benoetigt
-	private boolean isImplemented = false;
+  private Boolean isImplemented = false;
-	
-	/*
-	 * wird verwendet um bei der Codegenerierung die richtige Methoden - Signatur
-	 * auszuwaehlen 
-	 */
-	/*private*/ Set<A> methodSignatureConstraint = new HashSet<>();
-	
-	private Constraint<A> extendConstraint = null;
-	
-	public Constraint() {
-		super();
-	}
 
-  public Constraint(int initialCapacity) {
+  /*
-    super(initialCapacity);
+   * wird verwendet um bei der Codegenerierung die richtige Methoden - Signatur
+   * auszuwaehlen
+   */
+  /*private*/ Set<A> methodSignatureConstraint = new HashSet<>();
+
+  private Constraint<A> extendConstraint = null;
+
+  public Constraint() {
+    super();
   }
 
-	public Constraint(boolean isInherited, boolean isImplemented) {
+  public Constraint(Boolean isInherited, Boolean isImplemented) {
-		this.isInherited = isInherited;
+    this.isInherited = isInherited;
-		this.isImplemented = isImplemented;
+    this.isImplemented = isImplemented;
-	}
-	
-	public Constraint(boolean isInherited, boolean isImplemented, Constraint<A> extendConstraint, Set<A> methodSignatureConstraint) {
-		this.isInherited = isInherited;
-		this.isImplemented = isImplemented;
-		this.extendConstraint = extendConstraint;
-		this.methodSignatureConstraint = methodSignatureConstraint;
-	}
-	
-	public void setIsInherited(boolean isInherited) {
-		this.isInherited = isInherited;
-	}
-	
-	public boolean isInherited() {
-		return isInherited;
-	}
-	
-	public boolean isImplemented() {
-		return isImplemented;
-	}
-	
-	public Constraint<A> getExtendConstraint() {
-		return extendConstraint;
-	}
-	
-	public void setExtendConstraint(Constraint<A> c) {
-		extendConstraint = c;
-	}
-	
-	public Set<A> getmethodSignatureConstraint() {
-		return methodSignatureConstraint;
-	}
-	
-	public void setmethodSignatureConstraint(Set<A> c) {
-		methodSignatureConstraint = c;
-	}
-
-  public <B extends IConstraintElement> Constraint<B> createdMapped(Function<A,B> mapper) {
-    Constraint<B> result = new Constraint<>(this.size());
-    for (A element : this) {
-      result.add(mapper.apply(element));
-    }
-    return result;
   }
 
-	public String toString() {
+  public Constraint(Boolean isInherited, Boolean isImplemented, Constraint<A> extendConstraint, Set<A> methodSignatureConstraint) {
+    this.isInherited = isInherited;
+    this.isImplemented = isImplemented;
+    this.extendConstraint = extendConstraint;
+    this.methodSignatureConstraint = methodSignatureConstraint;
+  }
+
+  public void setIsInherited(Boolean isInherited) {
+    this.isInherited = isInherited;
+  }
+
+  public Boolean isInherited() {
+    return isInherited;
+  }
+
+  public Boolean isImplemented() {
+    return isImplemented;
+  }
+
+  public Constraint<A> getExtendConstraint() {
+    return extendConstraint;
+  }
+
+  public void setExtendConstraint(Constraint<A> c) {
+    extendConstraint = c;
+  }
+
+  public Set<A> getmethodSignatureConstraint() {
+    return methodSignatureConstraint;
+  }
+
+  public void setmethodSignatureConstraint(Set<A> c) {
+    methodSignatureConstraint = c;
+  }
+
+  public String toString() {
     return super.toString() + "\nisInherited = " + isInherited
       + " isOveridden = " + isImplemented
       + " msc[" + methodSignatureConstraint.size() + "] = " + methodSignatureConstraint
       //" + extendsContraint: "  + (extendConstraint != null ? extendConstraint.toStringBase() : "null" )
       + "\n";
-	}
+  }
-	
-	public String toStringBase() {
-		return super.toString();
-	}
 
-
+  public String toStringBase() {
-  @Override
+    return super.toString();
-  public int compareTo(Constraint<A> o) {
-    return this.toString().compareTo(o.toString());
   }
 
   private String serialUUID = null;
@@ -168,4 +155,5 @@ public class Constraint<A extends IConstraintElement> extends HashSet<A> impleme
 
     return keyStorage.getUnserialized(uuid, Constraint.class);
   }
+
 }

src/main/java/de/dhbwstuttgart/typeinference/constraints/Pair.java

@@ -21,7 +21,7 @@ public class Pair implements Serializable, IConstraintElement, ISerializableData
   private SourceLoc location;
 
   private PairOperator eOperator = PairOperator.SMALLER;
-  private boolean noUnification = false;
+  private Boolean noUnification = false;
 
 
   private Pair(RefTypeOrTPHOrWildcardOrGeneric TA1, RefTypeOrTPHOrWildcardOrGeneric TA2) {
@@ -43,7 +43,7 @@ public class Pair implements Serializable, IConstraintElement, ISerializableData
     this.location = location;
   }
 
-  public Pair(RefTypeOrTPHOrWildcardOrGeneric TA1, RefTypeOrTPHOrWildcardOrGeneric TA2, PairOperator eOp, boolean noUnification) {
+  public Pair(RefTypeOrTPHOrWildcardOrGeneric TA1, RefTypeOrTPHOrWildcardOrGeneric TA2, PairOperator eOp, Boolean noUnification) {
     // Konstruktor
     this(TA1, TA2);
     this.eOperator = eOp;
@@ -161,7 +161,7 @@ public class Pair implements Serializable, IConstraintElement, ISerializableData
     String op = data.getValue("op").getOf(String.class);
     SerialMap ta1 = data.getMap("ta1");
     SerialMap ta2 = data.getMap("ta2");
-    boolean noUnification = data.getValue("noUnification").getOf(Integer.class) == 1;
+    Boolean noUnification = data.getValue("noUnification").getOf(Integer.class) == 1;
     SerialMap location = data.getMapOrNull("location");
 
     var pair = new Pair(

src/main/java/de/dhbwstuttgart/typeinference/result/ResultPair.java

@@ -11,7 +11,7 @@ import de.dhbwstuttgart.typeinference.unify.UnifyContext;
  * Paare, welche das Unifikationsergebnis darstellen
  */
 public abstract class ResultPair<A extends RefTypeOrTPHOrWildcardOrGeneric,B extends RefTypeOrTPHOrWildcardOrGeneric>
-  implements Comparable<ResultPair<A,B>>, ISerializableData {
+implements ISerializableData {
     private final A left;
     private final B right;
 
@@ -65,16 +65,6 @@ public abstract class ResultPair<A extends RefTypeOrTPHOrWildcardOrGeneric,B ext
 		return true;
 	}
 
-	@Override
-	public int compareTo(ResultPair<A, B> o) {
-		if (o == null) {
-			return 1; // this is greater than null
-		}
-
-		return o.left.toString().compareTo(this.left.toString());
-	}
-
-
 
 	@Override
 	public SerialMap toSerial(KeyStorage keyStorage) {

src/main/java/de/dhbwstuttgart/typeinference/result/ResultSet.java

@@ -5,13 +5,10 @@ import de.dhbwstuttgart.server.packet.dataContainers.ISerializableData;
 import de.dhbwstuttgart.server.packet.dataContainers.KeyStorage;
 import de.dhbwstuttgart.server.packet.dataContainers.serialized.SerialList;
 import de.dhbwstuttgart.server.packet.dataContainers.serialized.SerialMap;
-import de.dhbwstuttgart.typeinference.unify.TypeUnifyTaskHelper;
 import de.dhbwstuttgart.typeinference.unify.UnifyContext;
-import de.dhbwstuttgart.util.Logger;
 import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.HashSet;
-import java.util.List;
 import java.util.Set;
 
 import de.dhbwstuttgart.exceptions.NotImplementedException;
@@ -24,32 +21,28 @@ import de.dhbwstuttgart.syntaxtree.type.TypePlaceholder;
 import java.util.stream.Collectors;
 
 @SuppressWarnings("rawtypes")
-public class ResultSet implements Comparable<ResultSet>, ISerializableData {
+public class ResultSet implements ISerializableData {
 
   public final Set<ResultPair> results;
   public Set<ResultPair<TypePlaceholder, TypePlaceholder>> genIns;
 
-    public ResultSet(Set<ResultPair> set){
+  public ResultSet(Set<ResultPair> set) {
-        this.results = set;
+    this.results = set;
-        this.genIns = TypeUnifyTaskHelper.getPresizedHashSet(results.size());
+    this.genIns = new HashSet<>();
-        results.forEach(x -> {
+    results.forEach(x -> {
-          if (x instanceof PairTPHsmallerTPH) {
+      if (x instanceof PairTPHsmallerTPH) {
-            this.genIns.add(x);
+        this.genIns.add(x);
-          }
+      }
-        });
+    });
-    }
+  }
 
-    public List<ResultPair> getSortedResults() {
+  public boolean contains(ResultPair toCheck) {
-      return results.stream().sorted().toList();
+    return this.results.contains(toCheck);
-    }
+  }
 
-    public boolean contains(ResultPair toCheck) {
+  public void remove(ResultPair toCheck) {
-    	return this.results.contains(toCheck);
+    results.remove(toCheck);
-    }
+  }
-    
-    public void remove(ResultPair toCheck) {
-    	results.remove(toCheck);
-    }
 
   public ResolvedType resolveType(RefTypeOrTPHOrWildcardOrGeneric type) {
     if (type instanceof TypePlaceholder)
@@ -92,24 +85,9 @@ public class ResultSet implements Comparable<ResultSet>, ISerializableData {
     }
   }
 
-	@Override
-	public int hashCode() {
-		return results.hashCode();
-	}
-
   @Override
-  public int compareTo(ResultSet o) {
+  public int hashCode() {
-    List<ResultPair> thisSorted = this.getSortedResults();
+    return results.hashCode();
-    List<ResultPair> otherSorted = o.getSortedResults();
-    int sizeCompare = Integer.compare(thisSorted.size(), otherSorted.size());
-    if (sizeCompare != 0) return sizeCompare;
-
-    for (int i = 0; i < thisSorted.size(); i++) {
-      int cmp = thisSorted.get(i).compareTo(otherSorted.get(i));
-      if (cmp != 0) return cmp;
-    }
-
-    return 0;
   }
 
   @Override
@@ -132,8 +110,6 @@ class Resolver implements ResultSetVisitor {
   private final Set<GenericInsertPair> additionalTPHs = new HashSet<>();
   private ResultPair<?, ?> currentPair;
 
-  public static Logger logger = new Logger("Resolver");
-
   public Resolver(ResultSet resultPairs) {
     this.result = resultPairs;
   }
@@ -141,7 +117,7 @@ class Resolver implements ResultSetVisitor {
   public ResolvedType resolve(TypePlaceholder tph) {
     toResolve = tph;
     resolved = null;
-    logger.info(tph.toString());
+    System.out.println(tph.toString());
     for (ResultPair<?, ?> resultPair : result.results) {
       if (resultPair instanceof PairTPHEqualTPH && ((PairTPHEqualTPH) resultPair).getLeft().equals(toResolve)) {
         currentPair = resultPair;

src/main/java/de/dhbwstuttgart/typeinference/typeAlgo/TYPE.java

@@ -1,7 +1,6 @@
 package de.dhbwstuttgart.typeinference.typeAlgo;
 
 import de.dhbwstuttgart.exceptions.DebugException;
-import de.dhbwstuttgart.parser.NullToken;
 import de.dhbwstuttgart.parser.SourceLoc;
 import de.dhbwstuttgart.parser.antlr.Java17Parser;
 import de.dhbwstuttgart.parser.scope.JavaClassName;
@@ -10,19 +9,15 @@ import de.dhbwstuttgart.syntaxtree.factory.ASTFactory;
 import de.dhbwstuttgart.syntaxtree.statement.Statement;
 import de.dhbwstuttgart.syntaxtree.type.RefType;
 import de.dhbwstuttgart.syntaxtree.type.RefTypeOrTPHOrWildcardOrGeneric;
-import de.dhbwstuttgart.target.tree.type.TargetRefType;
 import de.dhbwstuttgart.typeinference.assumptions.FieldAssumption;
 import de.dhbwstuttgart.typeinference.assumptions.TypeInferenceBlockInformation;
 import de.dhbwstuttgart.typeinference.assumptions.TypeInferenceInformation;
-import de.dhbwstuttgart.typeinference.constraints.Constraint;
 import de.dhbwstuttgart.typeinference.constraints.ConstraintSet;
 import de.dhbwstuttgart.typeinference.constraints.Pair;
-import de.dhbwstuttgart.typeinference.unify.TypeUnifyTaskHelper;
 import de.dhbwstuttgart.typeinference.unify.model.PairOperator;
 import de.dhbwstuttgart.util.BiRelation;
 import org.antlr.v4.runtime.Token;
 
-import java.lang.reflect.Modifier;
 import java.util.*;
 
 public class TYPE {
@@ -38,7 +33,7 @@ public class TYPE {
     public ConstraintSet getConstraints() {
         ConstraintSet ret = new ConstraintSet();
         for (ClassOrInterface cl : sf.KlassenVektor) {
-            Set<ClassOrInterface> allClasses = TypeUnifyTaskHelper.getPresizedHashSet(allAvailableClasses.size() + sf.availableClasses.size());
+            var allClasses = new HashSet<ClassOrInterface>();
             allClasses.addAll(allAvailableClasses);
             allClasses.addAll(sf.availableClasses);
             ret.addAll(getConstraintsClass(cl, new TypeInferenceInformation(allClasses)));
@@ -73,7 +68,7 @@ public class TYPE {
 
             for(SourceFile sourceFile : sfs){
                 for(JavaClassName importName : sourceFile.imports){
-                    context.logger().info(importName);
+                    System.out.println(importName);
                     try {
                         classes.add(ASTFactory.createClass(classLoader.loadClass(importName.toString())));
                     } catch (ClassNotFoundException e) {
@@ -92,25 +87,12 @@ public class TYPE {
         TypeInferenceBlockInformation blockInfo = new TypeInferenceBlockInformation(info.getAvailableClasses(), currentClass, m);
         TYPEStmt methodScope = new TYPEStmt(blockInfo);
         ConstraintSet constraintSet = new ConstraintSet();
+        m.getParameterList().getFormalparalist().forEach(el -> {
+            if(el instanceof RecordPattern){
+                constraintSet.addAll(addRecursiveParameterConstraints((RecordPattern) el, blockInfo));
 
-        if (m.name.equals("main") && Modifier.isStatic(m.modifier) && m.getParameterList().getFormalparalist().size() == 1) {
+            }
-            // Add constraint for main method
+        });
-            var firstParam = m.getParameterList().getParameterAt(0);
-
-            constraintSet.addUndConstraint(new Pair(firstParam.getType(),
-                new RefType(new JavaClassName("java.util.List"),
-                    List.of(new RefType(new JavaClassName("java.lang.String"), new NullToken())),
-                    new NullToken()),
-                PairOperator.EQUALSDOT));
-        } else {
-            m.getParameterList().getFormalparalist().forEach(el -> {
-                if (el instanceof RecordPattern rp){
-                    constraintSet.addAll(addRecursiveParameterConstraints(rp, blockInfo));
-                }
-            });
-        }
-
-
         m.block.accept(methodScope);
         constraintSet.addAll(methodScope.getConstraints());
         return constraintSet;

src/main/java/de/dhbwstuttgart/typeinference/typeAlgo/TYPEStmt.java

@@ -2,7 +2,6 @@
 package de.dhbwstuttgart.typeinference.typeAlgo;
 
 import de.dhbwstuttgart.typeinference.unify.PlaceholderRegistry;
-import de.dhbwstuttgart.typeinference.unify.TypeUnifyTaskHelper;
 import java.util.*;
 import java.util.stream.Collectors;
 
@@ -75,7 +74,7 @@ public class TYPEStmt implements StatementVisitor {
 
     @Override
     public void visit(LambdaExpression lambdaExpression) {
-        TypePlaceholder tphRetType = TypePlaceholder.fresh(new NullToken(), -1, false);
+        TypePlaceholder tphRetType = TypePlaceholder.fresh(new NullToken());
         List<RefTypeOrTPHOrWildcardOrGeneric> lambdaParams = lambdaExpression.params.getFormalparalist().stream().map((formalParameter -> formalParameter.getType())).collect(Collectors.toList());
         lambdaParams.add(tphRetType);
         // lambdaParams.add(0,tphRetType);
@@ -118,18 +117,17 @@ public class TYPEStmt implements StatementVisitor {
     @Override
     public void visit(FieldVar fieldVar) {
         fieldVar.receiver.accept(this);
-        List<FieldAssumption> fieldAssumptions = info.getFields(fieldVar.fieldVarName);
+        Set<Constraint> oderConstraints = new HashSet<>();
-        Set<Constraint> oderConstraints = TypeUnifyTaskHelper.getPresizedHashSet(fieldAssumptions.size());
 
 
-        for (FieldAssumption fieldAssumption : fieldAssumptions) {
+        for (FieldAssumption fieldAssumption : info.getFields(fieldVar.fieldVarName)) {
             Constraint constraint = new Constraint();
             GenericsResolver resolver = getResolverInstance();
             constraint.add(new Pair(fieldVar.receiver.getType(), fieldAssumption.getReceiverType(resolver), PairOperator.SMALLERDOT, loc(fieldVar.getOffset()))); // PL 2019-12-09: SMALLERDOT eingefuegt, EQUALSDOT entfernt, wenn ds Field privat ist muesste es EQUALSDOT lauten
             constraint.add(new Pair(fieldVar.getType(), fieldAssumption.getType(resolver), PairOperator.EQUALSDOT, loc(fieldVar.getOffset())));
             oderConstraints.add(constraint);
         }
-        if (oderConstraints.isEmpty())
+        if (oderConstraints.size() == 0)
             throw new TypeinferenceException("Kein Feld " + fieldVar.fieldVarName + " gefunden", fieldVar.getOffset());
         constraintsSet.addOderConstraint(oderConstraints);
     }
@@ -144,7 +142,7 @@ public class TYPEStmt implements StatementVisitor {
 
     @Override
     public void visit(ForEachStmt forEachStmt) {
-        var iterableType = new RefType(ASTFactory.createClass(java.lang.Iterable.class).getClassName(), List.of(new ExtendsWildcardType(forEachStmt.statement.getType(), new NullToken())), new NullToken());
+        var iterableType = new RefType(ASTFactory.createClass(java.lang.Iterable.class).getClassName(), Arrays.asList(new ExtendsWildcardType(forEachStmt.statement.getType(), new NullToken())), new NullToken());
         constraintsSet.addUndConstraint(new Pair(forEachStmt.expression.getType(), iterableType, PairOperator.SMALLERDOT, loc(forEachStmt.getOffset())));
         forEachStmt.statement.accept(this);
         forEachStmt.expression.accept(this);
@@ -192,7 +190,7 @@ public class TYPEStmt implements StatementVisitor {
         methodCall.receiver.accept(this);
         // Overloading:
         Set<Constraint<Pair>> methodConstraints = new HashSet<>();
-        for (MethodAssumption m : TYPEStmt.getMethods(methodCall.name, methodCall.arglist, info)) {
+        for (MethodAssumption m : this.getMethods(methodCall.name, methodCall.arglist, info)) {
             GenericsResolver resolver = getResolverInstance();
             Set<Constraint<Pair>> oneMethodConstraints = generateConstraint(methodCall, m, info, resolver);
             methodConstraints.addAll(oneMethodConstraints);
@@ -202,7 +200,7 @@ public class TYPEStmt implements StatementVisitor {
              * oneMethodConstraint.setExtendConstraint(extendsOneMethodConstraint); extendsOneMethodConstraint.setExtendConstraint(oneMethodConstraint); methodConstraints.add(extendsOneMethodConstraint);
              */
         }
-        if (methodConstraints.isEmpty()) {
+        if (methodConstraints.size() < 1) {
             throw new TypeinferenceException("Methode " + methodCall.name + " ist nicht vorhanden!", methodCall.getOffset());
         }
         constraintsSet.addOderConstraint(methodConstraints);
@@ -215,7 +213,7 @@ public class TYPEStmt implements StatementVisitor {
         for (MethodAssumption m : this.getConstructors(info, (RefType) methodCall.getType(), methodCall.getArgumentList())) {
             methodConstraints.add(generateConstructorConstraint(methodCall, m, info, getResolverInstance()));
         }
-        if (methodConstraints.isEmpty()) {
+        if (methodConstraints.size() < 1) {
             throw new TypeinferenceException("Konstruktor in Klasse " + methodCall.getType().toString() + " ist nicht vorhanden!", methodCall.getOffset());
         }
         constraintsSet.addOderConstraint(methodConstraints);
@@ -285,13 +283,8 @@ public class TYPEStmt implements StatementVisitor {
             // see: https://docs.oracle.com/javase/specs/jls/se7/html/jls-15.html#jls-15.17
             // Expression muss zu Numeric Convertierbar sein. also von Numeric erben
             Constraint<Pair> numeric;
-            HashSet<JavaClassName> classNames = TypeUnifyTaskHelper.getPresizedHashSet(info.getAvailableClasses().size());
-            for (var classEl : info.getAvailableClasses()) {
-                classNames.add(classEl.getClassName());
-            }
-
             // PL eingefuegt 2018-07-17
-            if (classNames.contains(bytee.getName())) {
+            if (info.getAvailableClasses().stream().map(x -> x.getClassName()).collect(Collectors.toCollection(HashSet::new)).contains(bytee.getName())) {
                 numeric = new Constraint<>();
                 numeric.add(new Pair(binary.lexpr.getType(), bytee, PairOperator.SMALLERDOT, loc(binary.getOffset())));
                 numeric.add(new Pair(binary.rexpr.getType(), bytee, PairOperator.SMALLERDOT, loc(binary.getOffset())));
@@ -299,7 +292,7 @@ public class TYPEStmt implements StatementVisitor {
                 numericAdditionOrStringConcatenation.add(numeric);
             }
             // PL eingefuegt 2018-07-17
-            if (classNames.contains(shortt.getName())) {
+            if (info.getAvailableClasses().stream().map(x -> x.getClassName()).collect(Collectors.toCollection(HashSet::new)).contains(shortt.getName())) {
                 numeric = new Constraint<>();
                 numeric.add(new Pair(binary.lexpr.getType(), shortt, PairOperator.SMALLERDOT, loc(binary.getOffset())));
                 numeric.add(new Pair(binary.rexpr.getType(), shortt, PairOperator.SMALLERDOT, loc(binary.getOffset())));
@@ -307,7 +300,7 @@ public class TYPEStmt implements StatementVisitor {
                 numericAdditionOrStringConcatenation.add(numeric);
             }
             // PL eingefuegt 2018-07-17
-            if (classNames.contains(integer.getName())) {
+            if (info.getAvailableClasses().stream().map(x -> x.getClassName()).collect(Collectors.toCollection(HashSet::new)).contains(integer.getName())) {
                 numeric = new Constraint<>();
                 numeric.add(new Pair(binary.lexpr.getType(), integer, PairOperator.SMALLERDOT, loc(binary.getOffset())));
                 numeric.add(new Pair(binary.rexpr.getType(), integer, PairOperator.SMALLERDOT, loc(binary.getOffset())));
@@ -315,7 +308,7 @@ public class TYPEStmt implements StatementVisitor {
                 numericAdditionOrStringConcatenation.add(numeric);
             }
             // PL eingefuegt 2018-07-17
-            if (classNames.contains(longg.getName())) {
+            if (info.getAvailableClasses().stream().map(x -> x.getClassName()).collect(Collectors.toCollection(HashSet::new)).contains(longg.getName())) {
                 numeric = new Constraint<>();
                 numeric.add(new Pair(binary.lexpr.getType(), longg, PairOperator.SMALLERDOT, loc(binary.getOffset())));
                 numeric.add(new Pair(binary.rexpr.getType(), longg, PairOperator.SMALLERDOT, loc(binary.getOffset())));
@@ -323,7 +316,7 @@ public class TYPEStmt implements StatementVisitor {
                 numericAdditionOrStringConcatenation.add(numeric);
             }
             // PL eingefuegt 2018-07-17
-            if (classNames.contains(floatt.getName())) {
+            if (info.getAvailableClasses().stream().map(x -> x.getClassName()).collect(Collectors.toCollection(HashSet::new)).contains(floatt.getName())) {
                 numeric = new Constraint<>();
                 numeric.add(new Pair(binary.lexpr.getType(), floatt, PairOperator.SMALLERDOT, loc(binary.getOffset())));
                 numeric.add(new Pair(binary.rexpr.getType(), floatt, PairOperator.SMALLERDOT, loc(binary.getOffset())));
@@ -331,7 +324,7 @@ public class TYPEStmt implements StatementVisitor {
                 numericAdditionOrStringConcatenation.add(numeric);
             }
             // PL eingefuegt 2018-07-17
-            if (classNames.contains(doublee.getName())) {
+            if (info.getAvailableClasses().stream().map(x -> x.getClassName()).collect(Collectors.toCollection(HashSet::new)).contains(doublee.getName())) {
                 numeric = new Constraint<>();
                 numeric.add(new Pair(binary.lexpr.getType(), doublee, PairOperator.SMALLERDOT, loc(binary.getOffset())));
                 numeric.add(new Pair(binary.rexpr.getType(), doublee, PairOperator.SMALLERDOT, loc(binary.getOffset())));
@@ -346,7 +339,7 @@ public class TYPEStmt implements StatementVisitor {
 
             if (binary.operation.equals(BinaryExpr.Operator.ADD)) {
                 // Dann kann der Ausdruck auch das aneinanderfügen zweier Strings sein: ("a" + "b") oder (1 + 2)
-                if (classNames.contains(string.getName())) {
+                if (info.getAvailableClasses().stream().map(x -> x.getClassName()).collect(Collectors.toCollection(HashSet::new)).contains(string.getName())) {
                     Constraint<Pair> stringConcat = new Constraint<>();
                     stringConcat.add(new Pair(binary.lexpr.getType(), string, PairOperator.EQUALSDOT, loc(binary.getOffset())));
                     stringConcat.add(new Pair(binary.rexpr.getType(), string, PairOperator.EQUALSDOT, loc(binary.getOffset())));
@@ -354,7 +347,7 @@ public class TYPEStmt implements StatementVisitor {
                     numericAdditionOrStringConcatenation.add(stringConcat);
                 }
             }
-            if (numericAdditionOrStringConcatenation.isEmpty()) {
+            if (numericAdditionOrStringConcatenation.size() < 1) {
                 throw new TypeinferenceException("Kein Typ für " + binary.operation.toString() + " vorhanden", binary.getOffset());
             }
             constraintsSet.addOderConstraint(numericAdditionOrStringConcatenation);
@@ -643,7 +636,6 @@ public class TYPEStmt implements StatementVisitor {
             params.add(resolver.resolve(new GenericRefType(gtv.getName(), new NullToken())));
         }
         RefTypeOrTPHOrWildcardOrGeneric receiverType;
-        
         if (receiver instanceof FunNClass) {
             receiverType = new RefType(new JavaClassName(receiver.getClassName().toString() + "$$"), params, new NullToken()); // new FunN(params);
         } else {
@@ -702,8 +694,8 @@ public class TYPEStmt implements StatementVisitor {
 
         Set<Pair> methodSignatureConstraint = generatemethodSignatureConstraint(forMethod, assumption, info, resolver);
 
-        //context.logger().info("methodSignatureConstraint: " + methodSignatureConstraint);
+        //System.out.println("methodSignatureConstraint: " + methodSignatureConstraint);
-        //context.logger().info("methodConstraint: " + methodConstraint);
+        //System.out.println("methodConstraint: " + methodConstraint);
 
         methodConstraint.setmethodSignatureConstraint(methodSignatureConstraint);
         extendsMethodConstraint.setmethodSignatureConstraint(methodSignatureConstraint);
@@ -741,7 +733,7 @@ public class TYPEStmt implements StatementVisitor {
         }
 
         // Zuordnung von MethodCall.signature(ReturnType) zu dem ReturnType der ausgewaehlten Methode (assumption.returnType)
-        ret.add(new Pair(foMethod.signature.getLast(), assumption.getReturnType(), PairOperator.EQUALSDOT));
+        ret.add(new Pair(foMethod.signature.get(foMethod.signature.size() - 1), assumption.getReturnType(), PairOperator.EQUALSDOT));
         return ret;
     }
 
@@ -754,8 +746,8 @@ public class TYPEStmt implements StatementVisitor {
                 // funNParams.add(TypePlaceholder.fresh(new NullToken()));
                 funNParams.add(new GenericRefType(NameGenerator.makeNewName(), new NullToken()));
             }
-            funNParams.getLast();
+            funNParams.get(funNParams.size() - 1);
-            ret.add(new MethodAssumption(new FunNClass(funNParams), funNParams.getLast(), funNParams.subList(0, funNParams.size() - 1), new TypeScope() {
+            ret.add(new MethodAssumption(new FunNClass(funNParams), funNParams.get(funNParams.size() - 1), funNParams.subList(0, funNParams.size() - 1), new TypeScope() {
                 @Override
                 public Iterable<? extends GenericTypeVar> getGenerics() {
                     throw new NotImplementedException();
@@ -850,7 +842,7 @@ public class TYPEStmt implements StatementVisitor {
             for (var child : switchStmt.getBlocks()) {
                 for (var label : child.getLabels()) {
                     if (label.getPattern() == null) {
-                        //context.logger().info("DefaultCase");
+                        //System.out.println("DefaultCase");
                     } else {
                         constraintsSet.addUndConstraint(
                                 new Pair(
@@ -891,9 +883,13 @@ public class TYPEStmt implements StatementVisitor {
 
             child.getLabels().forEach(el -> {
                 if (el.getType() instanceof RefType) {
-                  if (el.getPattern() instanceof RecordPattern pattern) {
+                    var recType = el;
-                    recursivelyAddRecordConstraints(pattern);
+
-                  }
+                    if (el.getPattern() instanceof RecordPattern) {
+                        var pattern = (RecordPattern) recType.getPattern();
+                        recursivelyAddRecordConstraints(pattern);
+                    }
+
                 }
             });
 
@@ -909,13 +905,13 @@ public class TYPEStmt implements StatementVisitor {
 
         var allClasses = info.getAvailableClasses();
         var interestingClasses = allClasses.stream().filter(as -> as.getClassName().equals(((RefType) pattern.getType()).getName())).toList();
-        var constructors = interestingClasses.getFirst().getConstructors();
+        var constructors = interestingClasses.get(0).getConstructors();
 
         int counter = 0;
 
         for (var subPattern : pattern.getSubPattern()) {
             for (Constructor con : constructors) {
-                //context.logger().info("----------------------\n" + subPattern.getType() + " | " + con.getParameterList().getParameterAt(counter).getType() + "\n----------------------\n");
+                //System.out.println("----------------------\n" + subPattern.getType() + " | " + con.getParameterList().getParameterAt(counter).getType() + "\n----------------------\n");
                 constraintsSet.addUndConstraint(new Pair(subPattern.getType(), con.getParameterList().getParameterAt(counter).getType(), PairOperator.SMALLERDOT, loc(con.getParameterList().getParameterAt(counter).getOffset())));
             }
             if (subPattern instanceof RecordPattern) recursivelyAddRecordConstraints((RecordPattern) subPattern);

src/main/java/de/dhbwstuttgart/typeinference/unify/CancellableTask.java

@@ -1,7 +1,6 @@
 package de.dhbwstuttgart.typeinference.unify;
 
 import java.util.ArrayList;
-import java.util.LinkedList;
 import java.util.List;
 import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.concurrent.RecursiveTask;
@@ -9,7 +8,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
 
 /**
  * An intermediate class for the recursive steps of the TypeUnifyTask:
- * This allows canceling parts of the recursion tree, instead of only  the whole execution as before. But in
+ * This allows to cancel parts of the recursion tree, instead of only  the whole execution as before. But in
  * order for that to work, all cancellable child tasks must be added when they are created
  *
  * @param <T>
@@ -17,45 +16,26 @@ import java.util.concurrent.atomic.AtomicBoolean;
 public abstract class CancellableTask<T> extends RecursiveTask<T> {
 
   private final AtomicBoolean executionCancelled = new AtomicBoolean(false);
-  private final List<CancellableTask<?>> childTasks = new LinkedList<>();
+  private final List<CancellableTask<?>> childTasks = new ArrayList<>();
   private CancellableTask<?> parentTask = null;
 
   /**
-   * Set the execution for this task and all its (recursive) children to be canceled
+   * Set the execution for this task and all its (recursive) children to be cancelled
    */
   protected void cancelExecution() {
-    // is this branch already canceled? Then do nothing
+    // is this branch already cancelled? Then do nothing
-    if (this.executionCancelled.getAndSet(true)) return;
+    if (this.executionCancelled.get()) return;
+    executionCancelled.set(true);
     this.cancelChildExecution();
   }
 
-  private void cancelChildExecution() {
+  public void cancelChildExecution() {
-    synchronized (this.childTasks) {
-      for (var childTask : childTasks) {
-        // no need to cancel a branch that is already finished
-        if (!childTask.isDone()) {
-          childTask.cancelExecution();
-        }
-      }
-    }
-  }
-
-  private void cancelChildExecutionAfter(CancellableTask<?> checkpointTask) {
-    boolean reachedCheckpoint = false;
-    int i = 0;
     for (var childTask : childTasks) {
-      if (!reachedCheckpoint) {
+      // no need to cancel a branch that is already finished
-        reachedCheckpoint = childTask == checkpointTask;
+      if (!childTask.isDone()) {
-      }
+        childTask.cancelExecution();
-      else {
-        // no need to cancel a branch that is already finished
-        if (!childTask.isDone()) {
-          childTask.cancelExecution();
-        }
-        i++;
       }
     }
-    System.out.println("Skipped " + i + " younger siblings");
   }
 
   protected void cancelSiblingTasks() {
@@ -66,12 +46,6 @@ public abstract class CancellableTask<T> extends RecursiveTask<T> {
     }
   }
 
-  public void cancelYoungerSiblingTasks() {
-    if (this.parentTask != null) {
-      this.parentTask.cancelChildExecutionAfter(this);
-    }
-  }
-
   public Boolean isExecutionCancelled() {
     return executionCancelled.get();
   }
@@ -79,9 +53,6 @@ public abstract class CancellableTask<T> extends RecursiveTask<T> {
   public void addChildTask(CancellableTask<?> childTask) {
     this.childTasks.add(childTask);
     childTask.setParentTask(this);
-    if (this.executionCancelled.get()) {
-      childTask.executionCancelled.set(true);
-    }
   }
 
   private void setParentTask(CancellableTask<?> parentTask) {

src/main/java/de/dhbwstuttgart/typeinference/unify/ConcurrentSetMergeTask.java

@@ -37,6 +37,9 @@ public class ConcurrentSetMergeTask<T> extends RecursiveTask<Set<T>> {
       totalElements += list.get(i).size();
     }
 
+    System.out.println("ConcurrentSetMerge? -> " + (size <= LIST_THRESHOLD || totalElements < ELEMENT_THRESHOLD ? "true" : "false"));
+
+
     // size will always be at least one
     if (true || size <= LIST_THRESHOLD || totalElements < ELEMENT_THRESHOLD) {
       Set<T> result = this.list.get(start);

src/main/java/de/dhbwstuttgart/typeinference/unify/MartelliMontanariUnify.java

@@ -94,8 +94,8 @@ public class MartelliMontanariUnify implements IUnify {
 			// SUBST - Rule
 			if(lhsType instanceof PlaceholderType) {
 				mgu.add((PlaceholderType) lhsType, rhsType);
-				//PL 2018-04-01 nach checken, ob es richtig ist, dass keine Substitutionen uebergeben werden muessen.
+				//PL 2018-04-01 nach checken, ob es richtig ist, dass keine Substitutionen uebergeben werden muessen. 
-				termsList.replaceAll(mgu::apply);
+				termsList = termsList.stream().map(x -> mgu.apply(x)).collect(Collectors.toCollection(ArrayList::new));
 				idx = idx+1 == termsList.size() ? 0 : idx+1;
 				continue;
 			}

src/main/java/de/dhbwstuttgart/typeinference/unify/RuleSet.java

@@ -1,12 +1,10 @@
 package de.dhbwstuttgart.typeinference.unify;
 
-import de.dhbwstuttgart.util.Logger;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.LinkedList;
 import java.util.List;
-import java.util.ListIterator;
 import java.util.Optional;
 import java.util.Queue;
 import java.util.Set;
@@ -14,16 +12,24 @@ import java.util.Stack;
 import java.util.function.Function;
 import java.util.stream.Collectors;
 
+import de.dhbwstuttgart.core.JavaTXCompiler;
 import de.dhbwstuttgart.exceptions.DebugException;
+import de.dhbwstuttgart.syntaxtree.factory.UnifyTypeFactory;
+import de.dhbwstuttgart.syntaxtree.type.ExtendsWildcardType;
+import de.dhbwstuttgart.syntaxtree.type.RefType;
 import de.dhbwstuttgart.typeinference.unify.interfaces.IFiniteClosure;
 import de.dhbwstuttgart.typeinference.unify.interfaces.IRuleSet;
 import de.dhbwstuttgart.typeinference.unify.model.*;
 import de.dhbwstuttgart.typeinference.constraints.Constraint;
+import de.dhbwstuttgart.typeinference.unify.distributeVariance;
 
+import java.io.FileWriter;
 import java.io.IOException;
 import java.io.Writer;
 import java.io.OutputStreamWriter;
 
+import org.apache.commons.io.output.NullOutputStream;
+
 /**
  * Implementation of the type inference rules.
  * @author Florian Steurer
@@ -31,17 +37,17 @@ import java.io.OutputStreamWriter;
  */
 public class RuleSet implements IRuleSet{
 	
-	Logger logger;
+	Writer logFile;
 	final PlaceholderRegistry placeholderRegistry;
 	
 	public RuleSet(PlaceholderRegistry placeholderRegistry) {
 		super();
-		logger = Logger.NULL_LOGGER;
+		logFile = OutputStreamWriter.nullWriter();
 		this.placeholderRegistry = placeholderRegistry;
 	}
 	
-	RuleSet(Logger logger, PlaceholderRegistry placeholderRegistry) {
+	RuleSet(Writer logFile, PlaceholderRegistry placeholderRegistry) {
-		this.logger = logger;
+		this.logFile = logFile;
 		this.placeholderRegistry = placeholderRegistry;
 	}
 	
@@ -294,8 +300,8 @@ public class RuleSet implements IRuleSet{
 		
 		if(dFromFc == null || !dFromFc.getTypeParams().arePlaceholders() || dFromFc.getTypeParams().size() != cFromFc.getTypeParams().size())
 			return Optional.empty();
-		//context.logger().info("cFromFc: " + cFromFc);
+		//System.out.println("cFromFc: " + cFromFc);
-		//context.logger().info("dFromFc: " + dFromFc);
+		//System.out.println("dFromFc: " + dFromFc);
 		int[] pi = pi(cFromFc.getTypeParams(), dFromFc.getTypeParams());
 		
 		if(pi.length == 0)
@@ -504,17 +510,17 @@ public class RuleSet implements IRuleSet{
 		TypeParams typeDParams = typeD.getTypeParams();
 		TypeParams typeDgenParams = typeDgen.getTypeParams();
 		
-		//context.logger().info("Pair: " +pair);
+		//System.out.println("Pair: " +pair);
-		//context.logger().info("typeD: " +typeD);
+		//System.out.println("typeD: " +typeD);
-		//context.logger().info("typeDParams: " +typeDParams);
+		//System.out.println("typeDParams: " +typeDParams);
-		//context.logger().info("typeDgen: " +typeD);
+		//System.out.println("typeDgen: " +typeD);
-		//context.logger().info("typeDgenParams: " +typeDgenParams);
+		//System.out.println("typeDgenParams: " +typeDgenParams);
 		Unifier unif = Unifier.identity();
 		for(int i = 0; i < typeDParams.size(); i++) { 
-			//context.logger().info("ADAPT" +typeDgenParams);
+			//System.out.println("ADAPT" +typeDgenParams);
 			if (typeDgenParams.get(i) instanceof PlaceholderType) 
-				unif.add((PlaceholderType) typeDgenParams.get(i), typeDParams.get(i));
+			unif.add((PlaceholderType) typeDgenParams.get(i), typeDParams.get(i));
-			else logger.exception(new Exception("ERROR in adapt rule: cannot add non placeholder type"));
+			else System.out.println("ERROR");
 		}
 		return Optional.of(new UnifyPair(unif.apply(newLhs), typeDs, PairOperator.SMALLERDOT, pair.getSubstitution(), pair.getBasePair()));
 	}
@@ -649,17 +655,15 @@ public class RuleSet implements IRuleSet{
 	
 	@Override
 	public Optional<Set<UnifyPair>> subst(Set<UnifyPair> pairs, List<Set<Constraint<UnifyPair>>> oderConstraints) {
-		// Statistically, typeMap will fill up quickly and resize multiple times. To reduce this, we start with a higher capacity
+		HashMap<UnifyType, Integer> typeMap = new HashMap<>();
-		HashMap<UnifyType, Integer> typeMap = new HashMap<>(200);
 		
 		Stack<UnifyType> occuringTypes = new Stack<>();
-		occuringTypes.ensureCapacity(pairs.size() * 3);
+		
-
 		for(UnifyPair pair : pairs) {
 			occuringTypes.push(pair.getLhsType());
 			occuringTypes.push(pair.getRhsType());
 		}
-
+		
 		while(!occuringTypes.isEmpty()) {
 			UnifyType t1 = occuringTypes.pop();
 			if(!typeMap.containsKey(t1))
@@ -671,12 +675,12 @@ public class RuleSet implements IRuleSet{
 			if(t1 instanceof SuperType)
 				occuringTypes.push(((SuperType) t1).getSuperedType());
 			else
-				t1.getTypeParams().forEach(occuringTypes::push);
+				t1.getTypeParams().forEach(x -> occuringTypes.push(x));	
 		}
-		LinkedList<UnifyPair> result1 = new LinkedList<UnifyPair>(pairs);
+		Queue<UnifyPair> result1 = new LinkedList<UnifyPair>(pairs);
 		ArrayList<UnifyPair> result = new ArrayList<UnifyPair>();
 		boolean applied = false;
-
+		
 		while(!result1.isEmpty()) {
 			UnifyPair pair = result1.poll();
 			PlaceholderType lhsType = null;
@@ -694,30 +698,19 @@ public class RuleSet implements IRuleSet{
 					&& !((rhsType instanceof WildcardType) && ((WildcardType)rhsType).getWildcardedType().equals(lhsType))) //PL eigefuegt 2018-02-18
 			{
 				Unifier uni = new Unifier(lhsType,  rhsType);
-				// apply unifier to result and result1 in place
+				result = result.stream().map(x -> uni.apply(pair,x)).collect(Collectors.toCollection(ArrayList::new));
-				result.replaceAll(p -> uni.apply(pair, p));
+				result1 = result1.stream().map(x -> uni.apply(pair,x)).collect(Collectors.toCollection(LinkedList::new));
-				ListIterator<UnifyPair> result1Iterator = result1.listIterator();
+				
-				while (result1Iterator.hasNext()) {
-					UnifyPair x = result1Iterator.next();
-					result1Iterator.set(uni.apply(pair, x));
-				}
-
 				Function<? super Constraint<UnifyPair>,? extends Constraint<UnifyPair>> applyUni = b -> b.stream().map(
 						x -> uni.apply(pair,x)).collect(Collectors.toCollection((b.getExtendConstraint() != null)
 								? () -> new Constraint<UnifyPair>(
 										  b.isInherited(),
 										  b.isImplemented(),
-										  b.getExtendConstraint().createdMapped(x -> uni.apply(pair,x)),
+										  b.getExtendConstraint().stream().map(x -> uni.apply(pair,x)).collect(Collectors.toCollection(Constraint::new)),
 										  b.getmethodSignatureConstraint().stream().map(x -> uni.apply(pair,x)).collect(Collectors.toCollection(HashSet::new)))
 								: () -> new Constraint<UnifyPair>(b.isInherited(), b.isImplemented())
 									));
-				oderConstraints.replaceAll(oc -> {
+				oderConstraints.replaceAll(oc -> oc.stream().map(applyUni).collect(Collectors.toCollection(HashSet::new)));
-						HashSet<Constraint<UnifyPair>> mapped = new HashSet<>(oc.size());
-						for (var element : oc) {
-							mapped.add(applyUni.apply(element));
-						}
-						return mapped;
-				});
 				/*
 						oderConstraints = oderConstraints.stream().map(
 						a -> a.stream().map(applyUni
@@ -871,11 +864,14 @@ public class RuleSet implements IRuleSet{
         								   UnifyType r = x.getRhsType();
         								   if (r instanceof PlaceholderType) { ((PlaceholderType)r).disableWildcardtable(); }
 								     } );
-
+		try {
-		logger.debug(() -> "FUNgreater: " + pair);
+			logFile.write("FUNgreater: " + pair + "\n");
-		logger.debug(() -> "FUNred: " + result);
+				logFile.write("FUNred: " + result + "\n");
-
+				// logFile.flush();
-
+			}
+		catch (IOException e) {
+			System.out.println("logFile-Error");
+		}
 		return Optional.of(result);
 	}
 	
@@ -941,8 +937,8 @@ public class RuleSet implements IRuleSet{
 
 		Set<UnifyPair> result = new HashSet<UnifyPair>();
 		
-		int variance = ((PlaceholderType)rhsType).getVariance();
+		Integer variance = ((PlaceholderType)rhsType).getVariance();
-		int inversVariance = distributeVariance.inverseVariance(variance);
+		Integer inversVariance = distributeVariance.inverseVariance(variance);
 		
 		UnifyType[] freshPlaceholders = new UnifyType[funNLhsType.getTypeParams().size()];
 		for(int i = 0; i < freshPlaceholders.length-1; i++) {
@@ -960,14 +956,18 @@ public class RuleSet implements IRuleSet{
 		result.add(new UnifyPair(rhsType, funNLhsType.setTypeParams(new TypeParams(freshPlaceholders)), PairOperator.EQUALSDOT, pair.getSubstitution(), pair.getBasePair()));
 		
 		result.stream().forEach(x -> { UnifyType l = x.getLhsType();
-									   if (l instanceof PlaceholderType) { ((PlaceholderType)l).disableWildcardtable(); }
+									   if (l instanceof PlaceholderType) { ((PlaceholderType)l).disableWildcardtable(); } 
 									   UnifyType r = x.getRhsType();
 									   if (r instanceof PlaceholderType) { ((PlaceholderType)r).disableWildcardtable(); }
 									 } );
-
+		try {
-		logger.debug(() -> "FUNgreater: " + pair);
+			logFile.write("FUNgreater: " + pair + "\n");
-		logger.debug(() -> "FUNgreater: " + result);
+			logFile.write("FUNgreater: " + result + "\n");
-
+			// logFile.flush();
+		}
+	catch (IOException e) {
+		System.out.println("lofFile-Error");
+	}
 		return Optional.of(result);
 	}
 
@@ -986,8 +986,8 @@ public class RuleSet implements IRuleSet{
 
 		Set<UnifyPair> result = new HashSet<UnifyPair>();
 		
-		int variance = ((PlaceholderType)lhsType).getVariance();
+		Integer variance = ((PlaceholderType)lhsType).getVariance();
-		int inversVariance = distributeVariance.inverseVariance(variance);
+		Integer inversVariance = distributeVariance.inverseVariance(variance);
 		
 		UnifyType[] freshPlaceholders = new UnifyType[funNRhsType.getTypeParams().size()];
 		for(int i = 0; i < freshPlaceholders.length-1; i++) {
@@ -1006,15 +1006,18 @@ public class RuleSet implements IRuleSet{
 		result.add(new UnifyPair(lhsType, funNRhsType.setTypeParams(new TypeParams(freshPlaceholders)), PairOperator.EQUALSDOT, pair.getSubstitution(), pair.getBasePair()));
 		
 		result.stream().forEach(x -> { UnifyType l = x.getLhsType();
-		   							   if (l instanceof PlaceholderType) { ((PlaceholderType)l).disableWildcardtable(); }
+		   							   if (l instanceof PlaceholderType) { ((PlaceholderType)l).disableWildcardtable(); } 
 		   							   UnifyType r = x.getRhsType();
 		   							   if (r instanceof PlaceholderType) { ((PlaceholderType)r).disableWildcardtable(); }
 									 } );
-
+		try {
-
+			logFile.write("FUNgreater: " + pair + "\n");
-		logger.debug(() -> "FUNgreater: " + pair);
+			logFile.write("FUNsmaller: " + result + "\n");
-		logger.debug(() -> "FUNsmaller: " + result);
+			// logFile.flush();
-
+		}
+	catch (IOException e) {
+		System.out.println("lofFile-Error");
+	}
 		return Optional.of(result);
 	}
 

src/main/java/de/dhbwstuttgart/typeinference/unify/TypeUnify.java

@@ -29,12 +29,17 @@ public class TypeUnify {
 	 * unify parallel ohne result modell
 	 */
 	public static Set<Set<UnifyPair>> unify(Set<UnifyPair> undConstrains, List<Set<Constraint<UnifyPair>>> oderConstraints, IFiniteClosure fc, UnifyContext unifyContext) {
-		ForkJoinPool pool = TypeUnify.createThreadPool(unifyContext.logger());
+		ForkJoinPool pool = TypeUnify.createThreadPool();
 		UnifyContext context = unifyContext.newWithParallel(true).newWithExecutor(pool);
 		TypeUnifyTask unifyTask = new TypeUnifyTask(undConstrains, oderConstraints, fc, context, 0);
 		Set<Set<UnifyPair>> res = joinFuture(unifyTask.compute());
-
+		try {
-		unifyContext.logger().debug("\nnoShortendElements: " + TypeUnifyTask.noShortendElements + "\n");
+			unifyContext.logFile().write("\nnoShortendElements: " + TypeUnifyTask.noShortendElements + "\n");
+			// logFile.flush();
+		}
+		catch (IOException e) {
+			System.err.println("no log-File");
+		}
 		return res;
 	}
 	
@@ -42,7 +47,7 @@ public class TypeUnify {
 	 * unify asynchron mit Rückgabe UnifyResultModel ohne dass alle results gesammelt sind
 	 */
 	public static UnifyResultModel unifyAsync(Set<UnifyPair> undConstrains, List<Set<Constraint<UnifyPair>>> oderConstraints, IFiniteClosure fc, UnifyContext unifyContext) {
-		ForkJoinPool pool = TypeUnify.createThreadPool(unifyContext.logger());
+		ForkJoinPool pool = TypeUnify.createThreadPool();
 		UnifyContext context = unifyContext.newWithExecutor(pool);
 		TypeUnifyTask unifyTask = new TypeUnifyTask(undConstrains, oderConstraints, fc, context, 0);
 		unifyTask.compute();
@@ -53,12 +58,18 @@ public class TypeUnify {
 	 * unify parallel mit Rückgabe UnifyResultModel nachdem alle results gesammelt sind
 	 */
 	public static Set<Set<UnifyPair>> unifyParallel(Set<UnifyPair> undConstrains, List<Set<Constraint<UnifyPair>>> oderConstraints, IFiniteClosure fc, UnifyContext unifyContext) {
-		ForkJoinPool pool = TypeUnify.createThreadPool(unifyContext.logger());
+		ForkJoinPool pool = TypeUnify.createThreadPool();
 		UnifyContext context = unifyContext.newWithParallel(true).newWithExecutor(pool);
 		TypeUnifyTask unifyTask = new TypeUnifyTask(undConstrains, oderConstraints, fc, context, 0);
 		var result = joinFuture(unifyTask.compute());
 
-		unifyContext.logger().debug("\nnoShortendElements: " + TypeUnifyTask.noShortendElements + "\n");
+		try {
+			unifyContext.logFile().write("\nnoShortendElements: " + TypeUnifyTask.noShortendElements +"\n");
+			// logFile.flush();
+		}
+		catch (IOException e) {
+			System.err.println("no log-File");
+		}
 		return result;
 	}
 	
@@ -76,12 +87,18 @@ public class TypeUnify {
 	public static Set<Set<UnifyPair>> unifyOderConstraints(Set<UnifyPair> undConstrains, List<Set<Constraint<UnifyPair>>> oderConstraints, IFiniteClosure fc, UnifyContext unifyContext) {
 		TypeUnifyTask unifyTask = new TypeUnifyTask(undConstrains, oderConstraints, fc, unifyContext.newWithParallel(false), 0);
 		Set<Set<UnifyPair>> res = joinFuture(unifyTask.compute());
-		unifyContext.logger().debug("\nnoShortendElements: " + TypeUnifyTask.noShortendElements +"\n");
+		try {
+			unifyContext.logFile().write("\nnoShortendElements: " + TypeUnifyTask.noShortendElements +"\n");
+			// logFile.flush();
+		}
+		catch (IOException e) {
+			System.err.println("no log-File");
+		}
 		return res;
 	}
 
-	private static ForkJoinPool createThreadPool(Logger logger) {
+	private static ForkJoinPool createThreadPool() {
-		logger.info("Available processors: " + Runtime.getRuntime().availableProcessors());
+		Logger.print("Available processors: " + Runtime.getRuntime().availableProcessors());
 		return new ForkJoinPool(
 			Runtime.getRuntime().availableProcessors(),
 			ForkJoinPool.defaultForkJoinWorkerThreadFactory,

src/main/java/de/dhbwstuttgart/typeinference/unify/TypeUnify2Task.java

@@ -34,7 +34,7 @@ public class TypeUnify2Task extends TypeUnifyTask {
   @Override
   public CompletableFuture<Set<Set<UnifyPair>>> compute() {
     if (one) {
-      context.logger().info("two");
+      System.out.println("two");
     }
     one = true;
     CompletableFuture<Set<Set<UnifyPair>>> res =
@@ -45,7 +45,7 @@ public class TypeUnify2Task extends TypeUnifyTask {
                */
     //writeLog("xxx");
     //noOfThread--;
-    if (this.isExecutionCancelled()) {
+    if (this.myIsCancelled()) {
       return CompletableFuture.completedFuture(new HashSet<>());
     } else {
       return res;
@@ -53,6 +53,12 @@ public class TypeUnify2Task extends TypeUnifyTask {
   }
 
   public void closeLogFile() {
-    context.logger().close();
+
+    try {
+      context.logFile().close();
+    } catch (IOException ioE) {
+      System.err.println("no log-File");
+    }
+
   }
 }

src/main/java/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java

@@ -3,7 +3,6 @@ package de.dhbwstuttgart.typeinference.unify;
 
 import de.dhbwstuttgart.exceptions.TypeinferenceException;
 import de.dhbwstuttgart.parser.NullToken;
-import de.dhbwstuttgart.server.ServerTaskLogger;
 import de.dhbwstuttgart.typeinference.constraints.Constraint;
 import de.dhbwstuttgart.typeinference.unify.cartesianproduct.VarianceCase;
 import de.dhbwstuttgart.typeinference.unify.interfaces.IFiniteClosure;
@@ -27,7 +26,11 @@ import de.dhbwstuttgart.typeinference.unify.model.WildcardType;
 import de.dhbwstuttgart.util.Logger;
 import de.dhbwstuttgart.util.Pair;
 import de.dhbwstuttgart.util.Tuple;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
 import java.io.Serial;
+import java.io.Writer;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -42,10 +45,13 @@ import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
 import java.util.concurrent.RecursiveTask;
+import java.util.concurrent.atomic.AtomicInteger;
 import java.util.function.BiFunction;
 import java.util.function.BinaryOperator;
 import java.util.stream.Collectors;
+import org.apache.commons.io.output.NullOutputStream;
 
 
 /**
@@ -60,7 +66,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
   private static int i = 0;
   private final boolean printtag = false;
 
-  public final UnifyContext context;
+  final UnifyContext context;
 
   /**
    * Element, das aus dem nextSet den Gleichunen dieses Threads hinzugefuegt wurde
@@ -102,19 +108,21 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
 
   int rekTiefeField;
 
-  int nOfUnify = 0;
+  Integer nOfUnify = 0;
 
-  int noUndefPair = 0;
+  Integer noUndefPair = 0;
 
-  int noAllErasedElements = 0;
+  Integer noAllErasedElements = 0;
 
   // some statistics for local output (they will not make sense when executed on the server)
   public static int noBacktracking;
   public static int noShortendElements;
   public static int noou = 0;
 
+  Boolean myIsCanceled = false;
+
   public TypeUnifyTask(UnifyContext context) {
-    this.context = context.newWithLogger(Logger.NULL_LOGGER);
+    this.context = context.newWithLogFile(new OutputStreamWriter(NullOutputStream.INSTANCE));
     rules = new RuleSet(context.placeholderRegistry());
   }
 
@@ -149,19 +157,24 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
     this.fc = fc;
     this.oup = new OrderingUnifyPair(fc, context);
 
-    this.context = (context.logger() instanceof ServerTaskLogger) ? context : context.newWithLogger(
+    Writer logFileWriter = OutputStreamWriter.nullWriter();
-      Logger.forFile(
+    if (context.log()) {
-        System.getProperty("user.dir") + "/logFiles/" + "Thread",
+      try {
-        "Unify"
+        logFileWriter = new FileWriter(System.getProperty("user.dir") + "/logFiles/" + "Thread");
-      )
+        logFileWriter.write("");
-    );
+      } catch (IOException e) {
+        System.err.println("log-File nicht vorhanden");
+      }
+    }
+    this.context = context.newWithLogFile(logFileWriter);
+
 
     /*Abbruchtest
     if (thNo > 10) {
-      context.logger().info("cancel");
+      System.out.println("cancel");
       usedTasks.cancel();
       writeLog(nOfUnify.toString() + "cancel");
-      context.logger().info("cancel");
+      System.out.println("cancel");
       try {
         logFile.write("Abbruch");
       }
@@ -170,7 +183,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
       }
     }
     */
-    rules = new RuleSet(context.logger(), context.placeholderRegistry());
+    rules = new RuleSet(context.logFile(), context.placeholderRegistry());
     this.rekTiefeField = rekTiefe;
     context.usedTasks().add(this);
   }
@@ -207,10 +220,17 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
 		}		
 }
 */
+  void myCancel(Boolean b) {
+    myIsCanceled = true;
+  }
+
+  public boolean myIsCancelled() {
+    return myIsCanceled;
+  }
 
   public CompletableFuture<Set<Set<UnifyPair>>> compute() {
     if (one) {
-      context.logger().info("two");
+      System.out.println("two");
     }
     one = true;
     Set<UnifyPair> neweq = new HashSet<>(eq);
@@ -227,7 +247,11 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
       .collect(Collectors.toCollection(ArrayList::new));
     var unifyFuture = unify(neweq, remainingOderconstraints, fc, context.parallel(), rekTiefeField, methodSignatureConstraint);
     return unifyFuture.thenApply(res -> {
-      context.logger().close();
+      try {
+        context.logFile().close();
+      } catch (IOException ioE) {
+        System.err.println("no log-File");
+      }
       if (isUndefinedPairSetSet(res)) {
         //fuer debug-Zwecke
         ArrayList<ArrayList<UnifyPair>> al = res.stream()
@@ -236,7 +260,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
         throw new TypeinferenceException("Unresolved constraints: " + res, new NullToken()); //return new HashSet<>();
       }
 
-      if (this.isExecutionCancelled()) {
+      if (this.myIsCancelled()) {
         return new HashSet<>();
       }
 
@@ -268,19 +292,19 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
     //		).collect(Collectors.toCollection(HashSet::new));
     //writeLog(nOfUnify.toString() + " AA: " + aas.toString());
     //if (aas.isEmpty()) {
-    //	context.logger().info("");
+    //	System.out.println("");
     //}
 
     //.collect(Collectors.toCollection(HashSet::new)));
 
-    if (this.isExecutionCancelled()) {
+    if (this.myIsCancelled()) {
       return CompletableFuture.completedFuture(new HashSet<>());
     }
 
     rekTiefe++;
     nOfUnify++;
-    context.logger().debug(() -> nOfUnify + " Unifikation: " + eq.toString());
+    writeLog(nOfUnify.toString() + " Unifikation: " + eq.toString());
-    context.logger().debug(() -> nOfUnify + " Oderconstraints: " + oderConstraints.toString());
+    writeLog(nOfUnify.toString() + " Oderconstraints: " + oderConstraints.toString());
 
     /*
      * Variancen auf alle Gleichungen vererben
@@ -302,10 +326,15 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
     /*
      * Occurs-Check durchfuehren
      */
-    Set<UnifyPair> ocurrPairs = TypeUnifyTaskHelper.occursCheck(eq);
+    Set<UnifyPair> ocurrPairs = eq.stream().filter(x -> {
-
+        UnifyType lhs, rhs;
-    Set<UnifyPair> finalOcurrPairs = ocurrPairs;
+        return (lhs = x.getLhsType()) instanceof PlaceholderType
-    context.logger().debug(() -> "ocurrPairs: " + finalOcurrPairs);
+          && !((rhs = x.getRhsType()) instanceof PlaceholderType)
+          && rhs.getTypeParams().occurs((PlaceholderType) lhs);
+      })
+      .peek(UnifyPair::setUndefinedPair)
+      .collect(Collectors.toCollection(HashSet::new));
+    writeLog("ocurrPairs: " + ocurrPairs);
     if (!ocurrPairs.isEmpty()) {
       Set<Set<UnifyPair>> ret = new HashSet<>();
       ret.add(ocurrPairs);
@@ -326,9 +355,15 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
       /* In commit dfd91b5f8b7fca1cb5f302eec4b0ba3330271c9b eingefuegt ANFANG */
       Set<UnifyPair> occurcheck = new HashSet<>(eq0);
       occurcheck.removeAll(eq0Prime);
-      ocurrPairs = TypeUnifyTaskHelper.occursCheck(occurcheck);
+      ocurrPairs = occurcheck.stream().filter(x -> {
-      Set<UnifyPair> finalOcurrPairs1 = ocurrPairs;
+          UnifyType lhs, rhs;
-      context.logger().debug(() -> "ocurrPairs: " + finalOcurrPairs1);
+          return (lhs = x.getLhsType()) instanceof PlaceholderType
+            && !((rhs = x.getRhsType()) instanceof PlaceholderType)
+            && rhs.getTypeParams().occurs((PlaceholderType) lhs);
+        })
+        .peek(UnifyPair::setUndefinedPair)
+        .collect(Collectors.toCollection(HashSet::new));
+      writeLog("ocurrPairs: " + ocurrPairs);
       if (!ocurrPairs.isEmpty()) {
         Set<Set<UnifyPair>> ret = new HashSet<>();
         ret.add(ocurrPairs);
@@ -340,8 +375,8 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
 
     eq0.forEach(UnifyPair::disableCondWildcards);
 
-    context.logger().debug(() ->nOfUnify + " Unifikation nach applyTypeUnificationRules: " + eq.toString());
+    writeLog(nOfUnify.toString() + " Unifikation nach applyTypeUnificationRules: " + eq.toString());
-    context.logger().debug(() -> nOfUnify + " Oderconstraints nach applyTypeUnificationRules: " + oderConstraints.toString());
+    writeLog(nOfUnify.toString() + " Oderconstraints nach applyTypeUnificationRules: " + oderConstraints.toString());
 
     /*
      * Step 2 and 3: Create a subset eq1s of pairs where both sides are TPH and eq2s of the other pairs
@@ -361,7 +396,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
     // cartesian product of the sets created by pattern matching.
     List<Set<? extends Set<UnifyPair>>> topLevelSets = new ArrayList<>();
 
-    //context.logger().info(eq2s);
+    //System.out.println(eq2s);
 
     if (!eq1s.isEmpty()) { // Do not add empty sets or the cartesian product will always be empty.
       Set<Set<UnifyPair>> wrap = new HashSet<>();
@@ -385,7 +420,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
     // Sets that originate from pair pattern matching
     // Sets of the "second level"
     Set<UnifyPair> undefinedPairs = new HashSet<>();
-    if (printtag) context.logger().info("eq2s " + eq2s);
+    if (printtag) System.out.println("eq2s " + eq2s);
     //writeLog("BufferSet: " + bufferSet.toString()+"\n");
     List<Set<Constraint<UnifyPair>>> oderConstraintsOutput = new ArrayList<>();//new ArrayList<>(oderConstraints);
     Set<Set<Set<? extends Set<UnifyPair>>>> secondLevelSets = calculatePairSets(eq2s, oderConstraints, fc, undefinedPairs, oderConstraintsOutput);
@@ -393,21 +428,21 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
     //nicht ausgewertet Faculty Beispiel im 1. Schritt
     //PL 2017-10-03 geloest, muesste noch mit FCs mit kleineren
     //Typen getestet werden.
-    context.logger().debug(() -> nOfUnify + " Oderconstraints2: " + oderConstraintsOutput.toString());
+    writeLog(nOfUnify.toString() + " Oderconstraints2: " + oderConstraintsOutput.toString());
-    if (printtag) context.logger().info("secondLevelSets:" + secondLevelSets);
+    if (printtag) System.out.println("secondLevelSets:" + secondLevelSets);
     // If pairs occured that did not match one of the cartesian product cases,
     // those pairs are contradictory and the unification is impossible.
     if (!undefinedPairs.isEmpty()) {
       noUndefPair++;
       for (UnifyPair up : undefinedPairs) {
-        context.logger().debug(() -> noUndefPair + " UndefinedPairs; " + up);
+        writeLog(noUndefPair.toString() + " UndefinedPairs; " + up);
-        context.logger().debug(() -> "BasePair; " + up.getBasePair());
+        writeLog("BasePair; " + up.getBasePair());
       }
       Set<Set<UnifyPair>> error = new HashSet<>();
       undefinedPairs = undefinedPairs.stream().peek(UnifyPair::setUndefinedPair)
         .collect(Collectors.toCollection(HashSet::new));
       error.add(undefinedPairs);
-      undefinedPairs.forEach(x -> context.logger().debug(() -> "AllSubst: " + x.getAllSubstitutions().toString()));
+      undefinedPairs.forEach(x -> writeLog("AllSubst: " + x.getAllSubstitutions().toString()));
       return CompletableFuture.completedFuture(error);
     }
 
@@ -417,16 +452,16 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
     // Alternative: Sub cartesian products of the second level (pattern matched) sets
     // "the big (x)"
 		/* for(Set<Set<Set<UnifyPair>>> secondLevelSet : secondLevelSets) {
-			//context.logger().info("secondLevelSet "+secondLevelSet.size());
+			//System.out.println("secondLevelSet "+secondLevelSet.size());
 			List<Set<Set<UnifyPair>>> secondLevelSetList = new ArrayList<>(secondLevelSet);
 			Set<List<Set<UnifyPair>>> cartResult = setOps.cartesianProduct(secondLevelSetList);
-			//context.logger().info("CardResult: "+cartResult.size());
+			//System.out.println("CardResult: "+cartResult.size());
 			// Flatten and add to top level sets
 			Set<Set<UnifyPair>> flat = new HashSet<>();
 			int j = 0;
 			for(List<Set<UnifyPair>> s : cartResult) {
 				j++;
-				//context.logger().info("s from CardResult: "+cartResult.size() + " " + j);
+				//System.out.println("s from CardResult: "+cartResult.size() + " " + j);
 				Set<UnifyPair> flat1 = new HashSet<>();
 				for(Set<UnifyPair> s1 : s)
 					flat1.addAll(s1);
@@ -440,8 +475,8 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
     for (Set<Set<? extends Set<UnifyPair>>> secondLevelSet : secondLevelSets) {
       topLevelSets.addAll(secondLevelSet);
     }
-    //context.logger().info(topLevelSets);
+    //System.out.println(topLevelSets);
-    //context.logger().info();
+    //System.out.println();
 
 
     //Aufruf von computeCartesianRecursive ANFANG
@@ -463,7 +498,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
     //		.collect(Collectors.toCollection(HashSet::new));
     //Muss auskommentiert werden, wenn computeCartesianRecursive ENDE
 
-    if (this.isExecutionCancelled()) {
+    if (this.myIsCancelled()) {
       return CompletableFuture.completedFuture(new HashSet<>());
     }
 
@@ -482,18 +517,18 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
      * Step 5: Substitution
      */
     //writeLog("vor Subst: " + eqPrime);
-    context.logger().debug(() -> "vor Subst: " + oderConstraints);
+    writeLog("vor Subst: " + oderConstraints);
     String ocString = oderConstraints.toString();
     List<Set<Constraint<UnifyPair>>> newOderConstraints = new ArrayList<>(oderConstraints);
     Optional<Set<UnifyPair>> eqPrimePrime = rules.subst(eqPrime, newOderConstraints);
     Set<Set<UnifyPair>> unifyres1 = null;
     Set<Set<UnifyPair>> unifyres2 = null;
     if (!ocString.equals(newOderConstraints.toString()))
-      context.logger().debug(() -> "nach Subst: " + newOderConstraints);
+      writeLog("nach Subst: " + newOderConstraints);
 
 
     {// sequentiell (Step 6b is included)
-      if (printtag) context.logger().info("nextStep: " + eqPrimePrime);
+      if (printtag) System.out.println("nextStep: " + eqPrimePrime);
       if (eqPrime.equals(eq) && eqPrimePrime.isEmpty()
         && oderConstraints.isEmpty()) {                    //PL 2017-09-29 //(!eqPrimePrime.isPresent()) auskommentiert und durch
         //PL 2017-09-29 dies ersetzt //(!eqPrimePrime.isPresent())
@@ -512,12 +547,12 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
           return eqPrimePrimeSet;
         });
         if (finalresult && isSolvedForm(eqPrime)) {
-          context.logger().debug(() -> "eqPrime:" + eqPrime.toString() + "\n");
+          writeLog("eqPrime:" + eqPrime.toString() + "\n");
 
           /* methodconstraintsets werden zum Ergebnis hinzugefuegt
            * Anfang
            */
-          //context.logger().info("methodSignatureConstraint Return: " + methodSignatureConstraint + "\n");
+          //System.out.println("methodSignatureConstraint Return: " + methodSignatureConstraint + "\n");
           eqPrimePrimeSetFuture = eqPrimePrimeSetFuture.thenApply(eqPrimePrimeSet -> {
             eqPrimePrimeSet.forEach(x -> x.addAll(methodSignatureConstraint));
 
@@ -568,8 +603,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
     return eqPrimePrimeSetFuture.thenApply(eqPrimePrimeSet -> {
       eqPrimePrimeSet = eqPrimePrimeSet.stream().filter(x -> isSolvedForm(x) || this.isUndefinedPairSet(x)).collect(Collectors.toCollection(HashSet::new));
       if (!eqPrimePrimeSet.isEmpty() && !isUndefinedPairSetSet(eqPrimePrimeSet)) {
-        Set<Set<UnifyPair>> finalEqPrimePrimeSet = eqPrimePrimeSet;
+        writeLog("Result1 " + eqPrimePrimeSet);
-        context.logger().debug(() -> "Result1 " + finalEqPrimePrimeSet);
       }
       return eqPrimePrimeSet;
     });
@@ -641,7 +675,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
     } else {
       //Varianz-Bestimmung Oder-Constraints
       if (printtag) {
-        context.logger().info("nextSetasList " + nextSetAsList);
+        System.out.println("nextSetasList " + nextSetAsList);
       }
       variance = TypeUnifyTaskHelper.calculateOderConstraintVariance(nextSetAsList);
     }
@@ -657,16 +691,14 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
      */
     Set<UnifyPair> sameEqSet = new HashSet<>();
     //optOrigPair enthaelt ggf. das Paar a = ty \in  nextSet
-    Optional<UnifyPair> optOrigPair;
+    Optional<UnifyPair> optOrigPair = Optional.empty();
     if (!oderConstraint) {
       optOrigPair = TypeUnifyTaskHelper.findEqualityConstrainedUnifyPair(nextSetElement);
-      context.logger().debug(() -> "optOrigPair: " + optOrigPair);
+      writeLog("optOrigPair: " + optOrigPair);
 
       if (optOrigPair.isPresent()) {
         sameEqSet = TypeUnifyTaskHelper.findConstraintsWithSameTVAssociation(optOrigPair.get(), singleElementSets);
       }
-    } else {
-      optOrigPair = Optional.empty();
     }
 
 
@@ -676,7 +708,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
 
     return resultFuture.thenApply(result -> {
       //2020-02-02: if (variance ==2) Hier Aufruf von filterOverriding einfuegen
-      context.logger().debug(() ->"Return computeCR: " + result.toString());
+      writeLog("Return computeCR: " + result.toString());
       return result;
     });
   }
@@ -703,23 +735,23 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
 
     VarianceCase varianceCase = VarianceCase.createFromVariance(variance, oderConstraint, this, context);
 
-    context.logger().debug(() -> "nextSet: " + nextSet.toString());
+    writeLog("nextSet: " + nextSet.toString());
-    context.logger().debug(() -> "nextSetasList: " + prevNextSetAsList.toString());
+    writeLog("nextSetasList: " + prevNextSetAsList.toString());
 
     varianceCase.selectNextData(this, prevNextSetAsList, optOrigPair);
 
     if (oderConstraint) {//Methodconstraints werden abgespeichert für die Bytecodegenerierung von Methodenaufrufen
       methodSignatureConstraint.addAll(((Constraint<UnifyPair>) varianceCase.a).getmethodSignatureConstraint());
-      context.logger().debug(() -> "ERSTELLUNG methodSignatureConstraint: " + methodSignatureConstraint);
+      writeLog("ERSTELLUNG methodSignatureConstraint: " + methodSignatureConstraint);
-      //context.logger().info("ERSTELLUNG methodSignatureConstraint: " +noOfThread+" "+methodSignatureConstraint);
+      //System.out.println("ERSTELLUNG methodSignatureConstraint: " +noOfThread+" "+methodSignatureConstraint);
-      //context.logger().info("a: " +a);
+      //System.out.println("a: " +a);
-      //context.logger().info("eq: " +eq);
+      //System.out.println("eq: " +eq);
-      //context.logger().info();
+      //System.out.println();
     }
 
     i++;
     Set<Set<UnifyPair>> elems = new HashSet<>(singleElementSets);
-    context.logger().debug(() -> "a1: " + rekTiefe + "  " + "variance:  " + variance + " " + varianceCase.a.toString() + "\n");
+    writeLog("a1: " + rekTiefe + "  " + "variance:  " + variance + " " + varianceCase.a.toString() + "\n");
 
     Set<Set<UnifyPair>> aParDef = new HashSet<>();
 
@@ -740,8 +772,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
     // Ergebnisvariable für die parallele Verabeitung: Tupel aus
     // - forkOrig result : currentThreadResult (frueher "res")
     // - fork results : forkResults (frueher "add_res")
-    CompletableFuture<VarianceCase.ComputationResults> parallelResultDataFuture;
+    CompletableFuture<Tuple<Set<Set<UnifyPair>>, Set<Set<Set<UnifyPair>>>>> parallelResultDataFuture;
-
 
     if (parallel) {
       parallelResultDataFuture = varianceCase.computeParallel(
@@ -752,16 +783,13 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
       // same as variance = 0
       elems.add(varianceCase.a); //PL 2019-01-16 muss das wirklich hin steht schon in Zeile 859 ja braucht man siehe Zeile 859
       parallelResultDataFuture =  this.unify2(elems, eq, oderConstraints, fc, false, rekTiefe, new HashSet<>(methodSignatureConstraint))
-        .thenApply(VarianceCase.ComputationResults::new);
+        .thenApply(currentThreadResult -> new Tuple<>(currentThreadResult, new HashSet<>()));
     }
 
-    if (this.isExecutionCancelled()) {
-      return CompletableFuture.completedFuture(new HashSet<>());
-    }
 
     return parallelResultDataFuture.thenCompose(parallelResultData -> {
-      Set<Set<UnifyPair>> currentThreadResult = parallelResultData.mainResult;
+      Set<Set<UnifyPair>> currentThreadResult = parallelResultData.getFirst();
-      Set<Set<Set<UnifyPair>>> forkResults = parallelResultData.forkResults;
+      Set<Set<Set<UnifyPair>>> forkResults = parallelResultData.getSecond();
 
       Set<Set<UnifyPair>> result = prevResult;
       List<Set<UnifyPair>> nextSetAsList = prevNextSetAsList;
@@ -770,7 +798,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
       //Ab hier alle parallele Berechnungen wieder zusammengeführt.
       if (oderConstraint) {//Wenn weiteres Element nextSetasList genommen wird, muss die vorherige methodsignatur geloescht werden
         methodSignatureConstraint.removeAll(((Constraint<UnifyPair>) varianceCase.a).getmethodSignatureConstraint());
-        //context.logger().info("REMOVE: " +methodSignatureConstraint);
+        //System.out.println("REMOVE: " +methodSignatureConstraint);
       }
       if (!isUndefinedPairSetSet(currentThreadResult) && isUndefinedPairSetSet(result)) {
         //wenn korrektes Ergebnis gefunden alle Fehlerfaelle loeschen
@@ -788,16 +816,16 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
 
             //Alle Variablen bestimmen die nicht hinzugefügt wurden in a
             //PL 2018-12-28: Hier gab es eine ClassCastException, war nicht reproduzierbar
-            // context.logger().info("");
+            // System.out.println("");
             List<PlaceholderType> vars_a = TypeUnifyTaskHelper.extractMatchingPlaceholderTypes(varianceCase.a);
             Set<UnifyPair> fstElemRes = currentThreadResult.iterator().next();
             Set<UnifyPair> compRes = fstElemRes.stream().filter(x -> vars_a.contains(((PlaceholderType) x.getLhsType()))).collect(Collectors.toCollection(HashSet::new));
 
             //Alle Variablen bestimmen die nicht hinzugefügt wurden in a_last
-            //context.logger().info(a_last);
+            //System.out.println(a_last);
 
             try {//PL eingefuegt 2019-03-06 da bei map mmer wieder Nullpointer kamen
-              a_last.forEach(x -> context.logger().debug(() -> "a_last_elem:" + x + " basepair: " + x.getBasePair()));//PL 2019-05-13 ins try hinzugefuegt Nullpointer-Exception ist in der Zeile aufgetaucht.
+              a_last.forEach(x -> writeLog("a_last_elem:" + x + " basepair: " + x.getBasePair()));//PL 2019-05-13 ins try hinzugefuegt Nullpointer-Exception ist in der Zeile aufgetaucht.
               List<PlaceholderType> varsLast_a = TypeUnifyTaskHelper.extractMatchingPlaceholderTypes(a_last);
               //[(java.util.Vector<java.lang.Integer> <. gen_aq, , 1), (CEK =. ? extends gen_aq, 1)] KANN VORKOMMEN
               //erstes Element genügt, da vars immer auf die gleichen Elemente zugeordnet werden muessen
@@ -806,12 +834,11 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
 
               varianceCase.applyComputedResults(result, currentThreadResult, compResult, compRes);
             } catch (NullPointerException e) {
-              context.logger().debug(() -> "NullPointerException: " + a_last.toString());
+              writeLog("NullPointerException: " + a_last.toString());
             }
           } else {
             //alle Fehlerfaelle und alle korrekten Ergebnis jeweils adden
-            Set<Set<UnifyPair>> finalResult = result;
+            writeLog("RES Fst: result: " + result.toString() + " currentThreadResult: " + currentThreadResult.toString());
-            context.logger().debug(() -> "RES Fst: result: " + finalResult.toString() + " currentThreadResult: " + currentThreadResult.toString());
             result.addAll(currentThreadResult);
           }
         }
@@ -825,19 +852,23 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
 
       if (parallel) {
         for (Set<Set<UnifyPair>> par_res : forkResults) {
+          if (variance == 0 && (!result.isEmpty() && (!isUndefinedPairSetSet(currentThreadResult)))) {
+            this.cancelChildExecution();
+            return CompletableFuture.completedFuture(result);
+          }
+
           if (!isUndefinedPairSetSet(par_res) && isUndefinedPairSetSet(result)) {
             //wenn korrektes Ergebnis gefunden alle Fehlerfaelle loeschen
             result = par_res;
             if (!par_res.isEmpty() && par_res.iterator().next() instanceof WildcardType) {
-              // context.logger().info();
+              // System.out.println();
             }
           } else {
             if ((isUndefinedPairSetSet(par_res) && isUndefinedPairSetSet(result))
               || (!isUndefinedPairSetSet(par_res) && !isUndefinedPairSetSet(result))
               || result.isEmpty()) {
               //alle Fehlerfaelle und alle korrekten Ergebnis jeweils adden
-              Set<Set<UnifyPair>> finalResult1 = result;
+              writeLog("RES var1 ADD:" + result.toString() + " " + par_res.toString());
-              context.logger().debug(() ->"RES var1 ADD:" + finalResult1.toString() + " " + par_res.toString());
               result.addAll(par_res);
             }
           }
@@ -858,15 +889,16 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
         // Iterator<Set<UnifyPair>> nextSetasListIt = new ArrayList<>(nextSetAsList).iterator();
         boolean shouldBreak = varianceCase.eraseInvalidSets(rekTiefe, aParDef, nextSetAsList);
         if (shouldBreak) {
-          // this.cancelYoungerSiblingTasks();
+          this.cancelChildExecution();
           return CompletableFuture.completedFuture(result);
         }
 
-        context.logger().debug(() -> "a: " + rekTiefe + " variance: " + variance + varianceCase.a.toString());
+        writeLog("a: " + rekTiefe + " variance: " + variance + varianceCase.a.toString());
       }
       /* auskommentiert um alle Max und min Betrachtung auszuschalten ENDE */
 
       if (isUndefinedPairSetSet(currentThreadResult) && aParDef.isEmpty()) {
+        int nofstred = 0;
         Set<UnifyPair> abhSubst = TypeUnifyTaskHelper.collectFromThreadResult(currentThreadResult, UnifyPair::getAllSubstitutions);
         abhSubst.addAll(
           TypeUnifyTaskHelper.collectFromThreadResult(currentThreadResult, UnifyPair::getThisAndAllBases)
@@ -896,10 +928,9 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
         */
 
         if (currentThreadResult.size() > 1) {
-          // context.logger().info();
+          // System.out.println();
         }
-        List<Set<UnifyPair>> finalNextSetAsList = nextSetAsList;
+        writeLog("nextSetasList vor filter-Aufruf: " + nextSetAsList);
-        context.logger().debug(() -> "nextSetasList vor filter-Aufruf: " + finalNextSetAsList);
         if (!oderConstraint) {//PL 2023-02-08 eingefuegt: Bei oderconstraints sind Subststitutionen nicht als Substitutionen in idesem Sinne zu sehen
           nextSetAsList = nextSetAsList.stream().filter(x -> {
               //Boolean ret = false;
@@ -910,29 +941,24 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
             })//.filter(y -> couldBecorrect(reducedUndefResSubstGroundedBasePair, y)) //fuer testzwecke auskommentiert um nofstred zu bestimmen PL 2018-10-10
             .collect(Collectors.toCollection(ArrayList::new));
         }
-
+        writeLog("nextSetasList nach filter-Aufruf: " + nextSetAsList);
-        if (context.logger().isLogLevelActive(Logger.LogLevel.DEBUG)) {
+        nofstred = nextSetAsList.size();
-          List<Set<UnifyPair>> finalNextSetAsList1 = nextSetAsList;
+        //NOCH NICHT korrekt PL 2018-10-12
-          context.logger().debug(() -> "nextSetasList nach filter-Aufruf: " + finalNextSetAsList1);
+        //nextSetasList = nextSetasList.stream().filter(y -> couldBecorrect(reducedUndefResSubstGroundedBasePair, y))
-          int nofstred = nextSetAsList.size();
+        //			.collect(Collectors.toCollection(ArrayList::new));
-          //NOCH NICHT korrekt PL 2018-10-12
+        writeLog("currentThreadResult (undef): " + currentThreadResult.toString());
-          //nextSetasList = nextSetasList.stream().filter(y -> couldBecorrect(reducedUndefResSubstGroundedBasePair, y))
+        writeLog("abhSubst: " + abhSubst.toString());
-          //			.collect(Collectors.toCollection(ArrayList::new));
+        writeLog("a2: " + rekTiefe + " " + varianceCase.a.toString());
-          context.logger().debug("currentThreadResult (undef): " + currentThreadResult.toString());
+        writeLog("Durchschnitt: " + durchschnitt.toString());
-          context.logger().debug("abhSubst: " + abhSubst.toString());
+        writeLog("nextSet: " + nextSet.toString());
-          context.logger().debug("a2: " + rekTiefe + " " + varianceCase.a.toString());
+        writeLog("nextSetasList: " + nextSetAsList.toString());
-          context.logger().debug("Durchschnitt: " + durchschnitt.toString());
+        writeLog("Number first erased Elements (undef): " + (len - nofstred));
-          context.logger().debug("nextSet: " + nextSet.toString());
+        writeLog("Number second erased Elements (undef): " + (nofstred - nextSetAsList.size()));
-          context.logger().debug("nextSetasList: " + nextSetAsList.toString());
+        writeLog("Number erased Elements (undef): " + (len - nextSetAsList.size()));
-          context.logger().debug("Number first erased Elements (undef): " + (len - nofstred));
+        noAllErasedElements += (len - nextSetAsList.size());
-          context.logger().debug("Number second erased Elements (undef): " + (nofstred - nextSetAsList.size()));
+        writeLog("Number of all erased Elements (undef): " + noAllErasedElements.toString());
-          context.logger().debug("Number erased Elements (undef): " + (len - nextSetAsList.size()));
+        writeLog("Number of Backtracking: " + noBacktracking++);
-          noAllErasedElements += (len - nextSetAsList.size());
+        // System.out.println("");
-          context.logger().debug("Number of all erased Elements (undef): " + noAllErasedElements);
-          context.logger().debug("Number of Backtracking: " + noBacktracking++);
-        }
-
-        // context.logger().info("");
       }
       //if (nextSetasList.size() == 0 && isUndefinedPairSetSet(result) && nextSet.size() > 1) {
       //	return result;
@@ -941,7 +967,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
       //	result.removeIf(y -> isUndefinedPairSet(y));
       //}
       //else result.stream().filter(y -> !isUndefinedPairSet(y));
-      context.logger().debug(() -> "currentThreadResult: " + currentThreadResult.toString());
+      writeLog("currentThreadResult: " + currentThreadResult.toString());
 
       return this.innerCartesianLoop(variance, rekTiefe, oderConstraint, parallel, result, varianceCase.a, nextSet,
         nextSetAsList, optOrigPair, methodSignatureConstraint, singleElementSets, sameEqSet, oderConstraints);
@@ -958,7 +984,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
    *                  the error constraints. Error constraints are added
    * @result contradiction of (a = ty) in sameEqSet
    */
-  public boolean checkNoContradiction(Set<UnifyPair> a, Set<UnifyPair> sameEqSet, Set<Set<UnifyPair>> result) {
+  public Boolean checkNoContradiction(Set<UnifyPair> a, Set<UnifyPair> sameEqSet, Set<Set<UnifyPair>> result) {
 
     //optAPair enthaelt ggf. das Paar a = ty' \in a
     //unterscheidet sich von optOrigPair, da dort a = ty
@@ -978,7 +1004,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
       UnifyPair aPair = optAPair.get();
       //writeLog("optOrigPair: " + optOrigPair + " " + "aPair: " + aPair+ " " + "aPair.basePair(): " + aPair.getBasePair());
 
-      context.logger().debug(() ->"checkA: " + aPair + "sameEqSet: " + sameEqSet);
+      writeLog("checkA: " + aPair + "sameEqSet: " + sameEqSet);
       for (UnifyPair sameEq : sameEqSet) {
         if (sameEq.getLhsType() instanceof PlaceholderType) {
           Set<UnifyPair> localEq = new HashSet<>();
@@ -999,7 +1025,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
             if (result.isEmpty() || isUndefinedPairSetSet(result)) {
               result.addAll(localRes);
             }
-            context.logger().debug(() ->"FALSE: " + aPair + "sameEqSet: " + sameEqSet);
+            writeLog("FALSE: " + aPair + "sameEqSet: " + sameEqSet);
             return false;
           }
         } else {
@@ -1021,12 +1047,12 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
             if (result.isEmpty() || isUndefinedPairSetSet(result)) {
               result.addAll(localRes);
             }
-            context.logger().debug(() ->"FALSE: " + aPair + "sameEqSet: " + sameEqSet);
+            writeLog("FALSE: " + aPair + "sameEqSet: " + sameEqSet);
             return false;
           }
         }
       }
-      context.logger().debug(() ->"TRUE: " + aPair + "sameEqSet: " + sameEqSet);
+      writeLog("TRUE: " + aPair + "sameEqSet: " + sameEqSet);
       return true;
     }
     return true;
@@ -1112,7 +1138,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
             // Through application of the rules, every pair should have one of the above forms.
             // Pairs that do not have one of the aboves form are contradictory.
             else {
-              context.logger().debug(() ->"Second erase:" + checkPair);
+              writeLog("Second erase:" + checkPair);
               return false;
             }
             //*/
@@ -1311,7 +1337,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
    * (as in case 1 where sigma is added to the innermost set).
    */
   protected Set<Set<Set<? extends Set<UnifyPair>>>> calculatePairSets(Set<UnifyPair> eq2s, List<Set<Constraint<UnifyPair>>> oderConstraintsInput, IFiniteClosure fc, Set<UnifyPair> undefined, List<Set<Constraint<UnifyPair>>> oderConstraintsOutput) {
-    context.logger().debug(() ->"eq2s: " + eq2s.toString());
+    writeLog("eq2s: " + eq2s.toString());
     oderConstraintsOutput.addAll(oderConstraintsInput);
     List<Set<Set<? extends Set<UnifyPair>>>> result = new ArrayList<>(9);
 
@@ -1398,12 +1424,10 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
       }
     }
 
-    if (context.logger().isLogLevelActive(Logger.LogLevel.DEBUG)) {
+    writeLog("eq2s: " + eq2s);
-      context.logger().debug("eq2s: " + eq2s);
+    writeLog("eq2sAsListFst: " + eq2sAsListFst);
-      context.logger().debug("eq2sAsListFst: " + eq2sAsListFst);
+    writeLog("eq2sAsListSnd: " + eq2sAsListSnd);
-      context.logger().debug("eq2sAsListSnd: " + eq2sAsListSnd);
+    writeLog("eq2sAsListBack: " + eq2sAsListBack);
-      context.logger().debug("eq2sAsListBack: " + eq2sAsListBack);
-    }
 
     eq2sAsList.addAll(eq2sAsListFst);
     eq2sAsList.addAll(eq2sAsListSnd);
@@ -1416,7 +1440,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
       if (!oderConstraintsOutput.isEmpty()) {
         Set<Constraint<UnifyPair>> ret = oderConstraintsOutput.removeFirst();
         //if (ret.iterator().next().iterator().next().getLhsType().getName().equals("M"))
-        //	context.logger().info("M");
+        //	System.out.println("M");
         //Set<UnifyPair> retFlat = new HashSet<>();
         //ret.stream().forEach(x -> retFlat.addAll(x));
 
@@ -1456,7 +1480,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
 
       // Case 1: (a <. Theta')
       if (((pairOp == PairOperator.SMALLERDOT) || (pairOp == PairOperator.SMALLERNEQDOT)) && lhsType instanceof PlaceholderType) {
-        //context.logger().info(pair);
+        //System.out.println(pair);
         if (first) { //writeLog(pair.toString()+"\n");
           Set<Set<UnifyPair>> x1 = new HashSet<>();
           if (pair.getRhsType().getName().equals("void")) {
@@ -1478,7 +1502,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
             x1.remove(remElem);
           }
 					/* ZU LOESCHEN ANFANG
-				//context.logger().info(x1);
+				//System.out.println(x1);
 					Set<UnifyPair> sameEqSet = eq2sAsList.stream()
 							  .filter(x -> ((x.getLhsType().equals(lhsType) || x.getRhsType().equals(lhsType)) && !x.equals(pair)))
 							  .collect(Collectors.toCollection(HashSet::new));
@@ -1696,11 +1720,11 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
     //		&& ((ReferenceType)thetaPrime).getTypeParams().iterator().next() instanceof PlaceholderType) //.getName().equals("java.util.Vector"))
     //		&& ((ReferenceType)((ReferenceType)thetaPrime).getTypeParams().iterator().next()).getTypeParams().iterator().next().getName().equals("java.lang.Integer")) {
     //		{
-    //		context.logger().info("");
+    //		System.out.println("");
     //}
     Set<UnifyType> cs = fc.getAllTypesByName(thetaPrime.getName());//cs= [java.util.Vector<NP>, java.util.Vector<java.util.Vector<java.lang.Integer>>, ????java.util.Vector<gen_hv>???]
 
-    context.logger().debug(() ->"cs: " + cs.toString());
+    writeLog("cs: " + cs.toString());
     //PL 18-02-06 entfernt, kommt durch unify wieder rein
     //cs.add(thetaPrime);
     //PL 18-02-06 entfernt
@@ -1711,9 +1735,8 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
         aa.putAll(b);
         return aa;
       };
-      var involvedPlaceholderTypes = x.getInvolvedPlaceholderTypes();
+      HashMap<PlaceholderType, PlaceholderType> hm = x.getInvolvedPlaceholderTypes().stream()
-      HashMap<PlaceholderType, PlaceholderType> hm = involvedPlaceholderTypes.stream()
+        .reduce(new HashMap<PlaceholderType, PlaceholderType>(),
-        .reduce(TypeUnifyTaskHelper.getPresizedHashMap(involvedPlaceholderTypes.size()),
           (aa, b) -> {
             aa.put(b, PlaceholderType.freshPlaceholder(context.placeholderRegistry()));
             return aa;
@@ -1733,8 +1756,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
       if ((match.match(ml)).isEmpty()) {
         thetaQs.remove(c);
       }
-      Set<UnifyType> finalThetaQs = thetaQs;
+      writeLog("thetaQs von " + c + ": " + thetaQs.toString());
-      context.logger().debug(() ->"thetaQs von " + c + ": " + finalThetaQs.toString());
       //Set<UnifyType> thetaQs = fc.getChildren(c).stream().collect(Collectors.toCollection(HashSet::new));
       //thetaQs.add(thetaPrime); //PL 18-02-05 wieder geloescht
       //PL 2017-10-03: War auskommentiert habe ich wieder einkommentiert,
@@ -1758,7 +1780,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
         for (TypeParams tp : permuteParams(candidateParams))
           thetaQPrimes.add(c.setTypeParams(tp));
       }
-      context.logger().debug(() ->"thetaQPrimes von " + c + ": " + thetaQPrimes.toString());
+      writeLog("thetaQPrimes von " + c + ": " + thetaQPrimes.toString());
       for (UnifyType tqp : thetaQPrimes) {//PL 2020-03-08 umbauen in der Schleife wird nur unifizierbarer Typ gesucht break am Ende
         Collection<PlaceholderType> tphs = tqp.getInvolvedPlaceholderTypes();
         Optional<Unifier> opt = stdUnify.unify(tqp, thetaPrime);
@@ -1831,7 +1853,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
         }
       }
     }
-    context.logger().debug(() ->"result von " + pair + ": " + result);
+    writeLog("result von " + pair + ": " + result);
     return result;
   }
 
@@ -1942,7 +1964,7 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
           return ((match.match(termList).isPresent()) || x);
         };
         //if (parai.getName().equals("java.lang.Integer")) {
-        //	context.logger().info("");
+        //	System.out.println("");
         //}
         BinaryOperator<Boolean> bo = (x, y) -> (x || y);
         if (fBounded.stream().reduce(false, f, bo)) {
@@ -2032,4 +2054,22 @@ public class TypeUnifyTask extends CancellableTask<CompletableFuture<Set<Set<Uni
       permuteParams(candidates, idx + 1, result, current);
     }
   }
+
+  public void writeLog(String str) {
+    if (context.log() && finalresult) {
+      synchronized (context.logFile()) {
+        try {
+					/*
+					logFile.write("Thread no.:" + thNo + "\n");
+					logFile.write("noOfThread:" + noOfThread + "\n");
+					logFile.write("parallel:" + parallel + "\n");
+					 */
+          context.logFile().write(str + "\n\n");
+          // logFile.flush();
+        } catch (IOException e) {
+          System.err.println("kein LogFile");
+        }
+      }
+    }
+  }
 }

src/main/java/de/dhbwstuttgart/typeinference/unify/TypeUnifyTaskHelper.java

@@ -5,7 +5,6 @@ import de.dhbwstuttgart.typeinference.unify.model.PlaceholderType;
 import de.dhbwstuttgart.typeinference.unify.model.UnifyPair;
 import de.dhbwstuttgart.typeinference.unify.model.UnifyType;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Optional;
@@ -186,36 +185,4 @@ public class TypeUnifyTaskHelper {
       .collect(Collectors.toCollection(ArrayList::new));
   }
 
-
-  public static Set<UnifyPair> occursCheck(final Set<UnifyPair> eq) {
-    Set<UnifyPair> ocurrPairs = new HashSet<>(eq.size());
-    for (UnifyPair x : eq) {
-      UnifyType lhs = x.getLhsType();
-      UnifyType rhs = x.getRhsType();
-      if (lhs instanceof PlaceholderType lhsPlaceholder &&
-        !(rhs instanceof PlaceholderType) &&
-        rhs.getTypeParams().occurs(lhsPlaceholder))
-      {
-        x.setUndefinedPair();
-        ocurrPairs.add(x);
-      }
-    }
-    return ocurrPairs;
-  }
-
-
-  public static <T> HashSet<T> getPresizedHashSet(int minElements) {
-    if (minElements < 16) return new HashSet<>();
-    // HashSet and HashMap will resize at 75% load, so we account for that by multiplying with 1.5
-    int n = (int)(minElements * 1.5);
-    return new HashSet<>(n);
-  }
-
-  public static <S,T> HashMap<S,T> getPresizedHashMap(int minElements) {
-    if (minElements < 16) return new HashMap<>();
-    // HashSet and HashMap will resize at 75% load, so we account for that by multiplying with 1.5
-    int n = (int)(minElements * 1.5);
-    return new HashMap<>(n);
-  }
-
 }

src/main/java/de/dhbwstuttgart/typeinference/unify/UnifyContext.java

@@ -1,15 +1,17 @@
 package de.dhbwstuttgart.typeinference.unify;
 
-import de.dhbwstuttgart.util.Logger;
 import java.io.Writer;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.ForkJoinPool;
+import java.util.concurrent.atomic.AtomicInteger;
 
 public record UnifyContext(
-  // main logger of a unification
+  // main log file of a unification
-  Logger logger,
+  Writer logFile,
+  // if logs should be made
+  Boolean log,
   // if the unify algorithm should run in parallel
-  boolean parallel,
+  Boolean parallel,
   // the model for storing calculated results
   UnifyResultModel resultModel,
   // the executor used for thread management in parallel execution
@@ -21,24 +23,26 @@ public record UnifyContext(
 ) {
 
   public UnifyContext(
-    Logger logger,
+    Writer logFile,
-    boolean parallel,
+    Boolean log,
+    Boolean parallel,
     UnifyResultModel resultModel,
     UnifyTaskModel usedTasks,
     ExecutorService executor,
     PlaceholderRegistry placeholderRegistry
   ) {
-    this(logger, parallel, resultModel, executor, placeholderRegistry, usedTasks);
+    this(logFile, log, parallel, resultModel, executor, placeholderRegistry, usedTasks);
   }
 
   public UnifyContext(
-    Logger logger,
+    Writer logFile,
-    boolean parallel,
+    Boolean log,
+    Boolean parallel,
     UnifyResultModel resultModel,
     UnifyTaskModel usedTasks,
     PlaceholderRegistry placeholderRegistry
   ) {
-    this(logger, parallel, resultModel, usedTasks, ForkJoinPool.commonPool(), placeholderRegistry);
+    this(logFile, log, parallel, resultModel, usedTasks, ForkJoinPool.commonPool(), placeholderRegistry);
   }
 
 
@@ -47,21 +51,20 @@ public record UnifyContext(
    * causes the UnifyContext to be essentially handled as a
    */
 
-  public UnifyContext newWithLogger(Logger logger) {
+  public UnifyContext newWithLogFile(Writer logFile) {
-    return new UnifyContext(logger, parallel, resultModel, executor, placeholderRegistry, usedTasks);
+    return new UnifyContext(logFile, log, parallel, resultModel, executor, placeholderRegistry, usedTasks);
   }
 
   public UnifyContext newWithParallel(boolean parallel) {
-    if (this.parallel == parallel) return this;
+    return new UnifyContext(logFile, log, parallel, resultModel, executor, placeholderRegistry, usedTasks);
-    return new UnifyContext(logger, parallel, resultModel, executor, placeholderRegistry, usedTasks);
   }
 
   public UnifyContext newWithExecutor(ExecutorService executor) {
-    return new UnifyContext(logger, parallel, resultModel, executor, placeholderRegistry, usedTasks);
+    return new UnifyContext(logFile, log, parallel, resultModel, executor, placeholderRegistry, usedTasks);
   }
 
   public UnifyContext newWithResultModel(UnifyResultModel resultModel) {
-    return new UnifyContext(logger, parallel, resultModel, executor, placeholderRegistry, usedTasks);
+    return new UnifyContext(logFile, log, parallel, resultModel, executor, placeholderRegistry, usedTasks);
   }
 
 }

src/main/java/de/dhbwstuttgart/typeinference/unify/UnifyTaskModel.java

@@ -12,7 +12,7 @@ public class UnifyTaskModel {
     
     public synchronized void cancel() {
     	for(TypeUnifyTask t : usedTasks) {
-    		t.cancelExecution();
+    		t.myCancel(true);
     	}
     }
 }

src/main/java/de/dhbwstuttgart/typeinference/unify/cartesianproduct/UnknownVarianceCase.java

@@ -1,110 +0,0 @@
-package de.dhbwstuttgart.typeinference.unify.cartesianproduct;
-
-import de.dhbwstuttgart.typeinference.constraints.Constraint;
-import de.dhbwstuttgart.typeinference.unify.TypeUnifyTask;
-import de.dhbwstuttgart.typeinference.unify.UnifyContext;
-import de.dhbwstuttgart.typeinference.unify.interfaces.IFiniteClosure;
-import de.dhbwstuttgart.typeinference.unify.model.PlaceholderType;
-import de.dhbwstuttgart.typeinference.unify.model.UnifyPair;
-import de.dhbwstuttgart.util.Tuple;
-import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Optional;
-import java.util.Set;
-import java.util.concurrent.CompletableFuture;
-import java.util.stream.Collectors;
-
-public class UnknownVarianceCase extends VarianceCase {
-
-  protected final int variance = 0;
-
-  protected UnknownVarianceCase(boolean isOderConstraint, TypeUnifyTask typeUnifyTask, UnifyContext context) {
-    super(isOderConstraint, typeUnifyTask, context);
-  }
-
-  @Override
-  public void selectNextData(
-    TypeUnifyTask typeUnifyTask,
-    List<Set<UnifyPair>> nextSetAsList,
-    Optional<UnifyPair> optOrigPair
-
-  ) {
-    //wenn a <. theta dann ist ein maximales Element sehr wahrscheinlich
-    //wenn theta <. a dann ist ein minimales Element sehr wahrscheinlich
-    if (!this.isOderConstraint && optOrigPair != null && optOrigPair.isPresent()) {
-      if (optOrigPair.get().getBasePair().getLhsType() instanceof PlaceholderType) {
-        a = typeUnifyTask.oup.max(nextSetAsList.iterator());
-      } else {
-        a = typeUnifyTask.oup.min(nextSetAsList.iterator());
-      }
-      nextSetAsList.remove(a);
-    } else if (this.isOderConstraint) {
-      a = typeUnifyTask.oup.max(nextSetAsList.iterator());
-      nextSetAsList.remove(a);
-      nextSetasListOderConstraints.add(((Constraint<UnifyPair>) a).getExtendConstraint());
-    } else {
-      a = nextSetAsList.removeFirst();
-    }
-  }
-
-  @Override
-  public CompletableFuture<ComputationResults> computeParallel(
-    Set<Set<UnifyPair>> elems,
-    Set<UnifyPair> eq,
-    List<Set<Constraint<UnifyPair>>> oderConstraints,
-    IFiniteClosure fc,
-    int rekTiefe,
-    Set<UnifyPair> methodSignatureConstraint,
-    List<Set<UnifyPair>> nextSetAsList,
-    Set<UnifyPair> sameEqSet,
-    Set<Set<UnifyPair>> result,
-    Set<Set<UnifyPair>> aParDef
-  ) {
-    elems.add(a);
-    return typeUnifyTask.unify2(elems, eq, oderConstraints, fc, context.parallel(), rekTiefe, new HashSet<>(methodSignatureConstraint))
-      .thenApply(ComputationResults::new);
-  }
-
-  @Override
-  public void applyComputedResults(
-    Set<Set<UnifyPair>> result,
-    Set<Set<UnifyPair>> currentThreadResult,
-    Set<UnifyPair> compResult,
-    Set<UnifyPair> compRes
-  ) {
-    context.logger().debug("RES var=0 ADD:" + result.toString() + " " + currentThreadResult.toString());
-    result.addAll(currentThreadResult);
-  }
-
-  @Override
-  public boolean eraseInvalidSets(
-    int rekTiefe,
-    Set<Set<UnifyPair>> aParDef,
-    List<Set<UnifyPair>> nextSetAsList
-  ) {
-    if (!this.isOderConstraint) {
-      return true;
-    } else {
-      nextSetAsList.removeAll(nextSetasListOderConstraints);
-      nextSetasListOderConstraints = new ArrayList<>();
-      context.logger().debug("Removed: " + nextSetasListOderConstraints);
-      List<Set<UnifyPair>> smallerSetasList = typeUnifyTask.oup.smallerThan(a, nextSetAsList);
-      List<Set<UnifyPair>> notInherited = smallerSetasList.stream()
-        .filter(x -> !((Constraint<UnifyPair>) x).isInherited())
-        .collect(Collectors.toCollection(ArrayList::new));
-      List<Set<UnifyPair>> notErased = new ArrayList<>();
-      notInherited.forEach(x -> notErased.addAll(typeUnifyTask.oup.smallerEqThan(x, smallerSetasList)));
-      List<Set<UnifyPair>> erased = new ArrayList<>(smallerSetasList);
-      erased.removeAll(notErased);
-      nextSetAsList.removeAll(erased);
-
-      context.logger().debug("Removed: " + erased);
-
-      context.logger().debug("Not Removed: " + nextSetAsList);
-
-    }
-    return false;
-  }
-
-}

src/main/java/de/dhbwstuttgart/typeinference/unify/cartesianproduct/Variance0Case.java

@@ -0,0 +1,228 @@
+package de.dhbwstuttgart.typeinference.unify.cartesianproduct;
+
+import de.dhbwstuttgart.exceptions.UnifyCancelException;
+import de.dhbwstuttgart.typeinference.constraints.Constraint;
+import de.dhbwstuttgart.typeinference.unify.TypeUnify2Task;
+import de.dhbwstuttgart.typeinference.unify.TypeUnifyTask;
+import de.dhbwstuttgart.typeinference.unify.UnifyContext;
+import de.dhbwstuttgart.typeinference.unify.interfaces.IFiniteClosure;
+import de.dhbwstuttgart.typeinference.unify.model.PlaceholderType;
+import de.dhbwstuttgart.typeinference.unify.model.UnifyPair;
+import de.dhbwstuttgart.util.Tuple;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.stream.Collectors;
+
+public class Variance0Case extends VarianceCase {
+
+  protected final int variance = 0;
+
+  protected Variance0Case(boolean isOderConstraint, TypeUnifyTask typeUnifyTask, UnifyContext context) {
+    super(isOderConstraint, typeUnifyTask, context);
+  }
+
+  @Override
+  public void selectNextData(
+    TypeUnifyTask typeUnifyTask,
+    List<Set<UnifyPair>> nextSetAsList,
+    Optional<UnifyPair> optOrigPair
+
+  ) {
+    //wenn a <. theta dann ist ein maximales Element sehr wahrscheinlich
+    //wenn theta <. a dann ist ein minimales Element sehr wahrscheinlich
+    if (!this.isOderConstraint && optOrigPair != null && optOrigPair.isPresent()) {
+      if (optOrigPair.get().getBasePair().getLhsType() instanceof PlaceholderType) {
+        a = typeUnifyTask.oup.max(nextSetAsList.iterator());
+      } else {
+        a = typeUnifyTask.oup.min(nextSetAsList.iterator());
+      }
+      nextSetAsList.remove(a);
+    } else if (this.isOderConstraint) {
+      a = typeUnifyTask.oup.max(nextSetAsList.iterator());
+      nextSetAsList.remove(a);
+      nextSetasListOderConstraints.add(((Constraint<UnifyPair>) a).getExtendConstraint());
+    } else {
+      a = nextSetAsList.removeFirst();
+    }
+
+
+    Set<UnifyPair> finalA = a;
+    if (!this.isOderConstraint && optOrigPair != null && optOrigPair.isPresent()) {
+      if (optOrigPair.get().getBasePair().getLhsType() instanceof PlaceholderType) {
+        nextSetasListRest = typeUnifyTask.oup.maxElements(
+          nextSetAsList.stream().filter(a_next -> typeUnifyTask.oup.compare(finalA, a_next) != 1).toList()
+        );
+      } else {
+        nextSetasListRest = typeUnifyTask.oup.minElements(
+          nextSetAsList.stream().filter(a_next -> typeUnifyTask.oup.compare(finalA, a_next) != -1).toList()
+        );
+      }
+      nextSetAsList.remove(a);
+    } else if (this.isOderConstraint) {
+      nextSetasListRest = typeUnifyTask.oup.maxElements(
+        nextSetAsList.stream().filter(a_next -> typeUnifyTask.oup.compare(finalA, a_next) != 1).toList()
+      );
+    } else {
+      for (int i = 0; i < Math.min(nextSetAsList.size(), 5); i++) {
+        nextSetasListRest.add(nextSetAsList.removeFirst());
+      }
+    }
+  }
+
+  @Override
+  public CompletableFuture<Tuple<Set<Set<UnifyPair>>, Set<Set<Set<UnifyPair>>>>> computeParallel(
+    Set<Set<UnifyPair>> elems,
+    Set<UnifyPair> eq,
+    List<Set<Constraint<UnifyPair>>> oderConstraints,
+    IFiniteClosure fc,
+    int rekTiefe,
+    Set<UnifyPair> methodSignatureConstraint,
+    List<Set<UnifyPair>> nextSetAsList,
+    Set<UnifyPair> sameEqSet,
+    Set<Set<UnifyPair>> result,
+    Set<Set<UnifyPair>> aParDef
+  ) {
+    CompletableFuture<Tuple<Set<Set<UnifyPair>>, Set<Set<Set<UnifyPair>>>>> resultValues = CompletableFuture.completedFuture(new Tuple<>(
+      new HashSet<>(), new HashSet<>()
+    ));
+
+    Set<UnifyPair> newEqOrig = new HashSet<>(eq);
+    Set<Set<UnifyPair>> newElemsOrig = new HashSet<>(elems);
+    List<Set<Constraint<UnifyPair>>> newOderConstraintsOrig = new ArrayList<>(oderConstraints);
+    newElemsOrig.add(a);
+
+    /* FORK ANFANG */
+    TypeUnify2Task forkOrig = new TypeUnify2Task(newElemsOrig, newEqOrig, newOderConstraintsOrig, a, fc, context, rekTiefe, new HashSet<>(methodSignatureConstraint));
+    typeUnifyTask.addChildTask(forkOrig);
+    // schedule compute() on another thread
+    CompletableFuture<Set<Set<UnifyPair>>> forkOrigFuture = CompletableFuture.supplyAsync(forkOrig::compute, context.executor()).thenCompose(f -> f);
+    resultValues = resultValues.thenCombine(forkOrigFuture,
+      (prevResults, currentThreadResult) -> {
+        forkOrig.writeLog("final Orig 0");
+        forkOrig.closeLogFile();
+        return new Tuple<>(currentThreadResult, prevResults.getSecond());
+      });
+
+    //forks.add(forkOrig);
+    if (typeUnifyTask.myIsCancelled()) {
+      throw new UnifyCancelException();
+    }
+    /* FORK ENDE */
+
+    writeLog("a in " + variance + " " + a);
+    writeLog("nextSetasListRest: " + nextSetasListRest.toString());
+
+    while (!nextSetasListRest.isEmpty()) {
+      Set<UnifyPair> nSaL = nextSetasListRest.removeFirst();
+      nextSetAsList.remove(nSaL);
+      writeLog("0 RM" + nSaL.toString());
+
+      if (!this.isOderConstraint) {
+        //ueberpruefung ob zu a =. ty \in nSaL in sameEqSet ein Widerspruch besteht
+        if (!sameEqSet.isEmpty() && !typeUnifyTask.checkNoContradiction(nSaL, sameEqSet, result)) {
+          TypeUnifyTask.noShortendElements++;
+          continue;
+        }
+      } else {
+        nextSetasListOderConstraints.add(((Constraint<UnifyPair>) nSaL).getExtendConstraint());
+      }
+      Set<UnifyPair> newEq = new HashSet<>(eq);
+      Set<Set<UnifyPair>> newElems = new HashSet<>(elems);
+      List<Set<Constraint<UnifyPair>>> newOderConstraints = new ArrayList<>(oderConstraints);
+      newElems.add(nSaL);
+      TypeUnify2Task fork = new TypeUnify2Task(newElems, newEq, newOderConstraints, nSaL, fc, context, rekTiefe, new HashSet<>(methodSignatureConstraint));
+      typeUnifyTask.addChildTask(fork);
+      // schedule compute() on another thread
+      CompletableFuture<Set<Set<UnifyPair>>> forkFuture = CompletableFuture.supplyAsync(fork::compute, context.executor()).thenCompose(f -> f);
+      resultValues = resultValues.thenCombine(forkFuture,
+        (prevResults, fork_res) -> {
+          if (typeUnifyTask.myIsCancelled()) {
+            throw new UnifyCancelException();
+          }
+          writeLog("fork_res: " + fork_res.toString());
+          writeLog(Boolean.valueOf((typeUnifyTask.isUndefinedPairSetSet(fork_res))).toString());
+          prevResults.getSecond().add(fork_res);
+          if (!typeUnifyTask.isUndefinedPairSetSet(fork_res)) {
+            aParDef.add(fork.getNextSetElement());
+          }
+          fork.writeLog("final 0");
+          fork.closeLogFile();
+          return prevResults;
+        }
+      );
+
+      if (typeUnifyTask.myIsCancelled()) {
+        throw new UnifyCancelException();
+      }
+    }
+
+    return resultValues;
+  }
+
+  @Override
+  public void applyComputedResults(
+    Set<Set<UnifyPair>> result,
+    Set<Set<UnifyPair>> currentThreadResult,
+    Set<UnifyPair> compResult,
+    Set<UnifyPair> compRes
+  ) {
+    writeLog("RES var=0 ADD:" + result.toString() + " " + currentThreadResult.toString());
+    result.addAll(currentThreadResult);
+  }
+
+  @Override
+  public boolean eraseInvalidSets(
+    int rekTiefe,
+    Set<Set<UnifyPair>> aParDef,
+    List<Set<UnifyPair>> nextSetAsList
+  ) {
+    if (!this.isOderConstraint) {
+      return true;
+    } else {
+
+      nextSetAsList.removeAll(nextSetasListOderConstraints);
+      nextSetasListOderConstraints = new ArrayList<>();
+      writeLog("Removed: " + nextSetasListOderConstraints);
+      final List<Set<UnifyPair>> smallerSetasList = typeUnifyTask.oup.smallerThan(a, nextSetAsList);
+      List<Set<UnifyPair>> notInherited = smallerSetasList.stream()
+        .filter(x -> !((Constraint<UnifyPair>) x).isInherited())
+        .collect(Collectors.toCollection(ArrayList::new));
+      final List<Set<UnifyPair>> notErased = new ArrayList<>();
+      notInherited.forEach(x -> notErased.addAll(typeUnifyTask.oup.smallerEqThan(x, smallerSetasList)));
+      List<Set<UnifyPair>> erased = new ArrayList<>(smallerSetasList);
+      erased.removeAll(notErased);
+      nextSetAsList.removeAll(erased);
+      writeLog("Removed: " + erased);
+      writeLog("Not Removed: " + nextSetAsList);
+
+      for (Set<UnifyPair> aPar : aParDef) {
+
+        nextSetAsList.removeAll(nextSetasListOderConstraints);
+        nextSetasListOderConstraints = new ArrayList<>();
+        writeLog("Removed: " + nextSetasListOderConstraints);
+        smallerSetasList.clear();
+        smallerSetasList.addAll(typeUnifyTask.oup.smallerThan(aPar, nextSetAsList));
+        notInherited = smallerSetasList.stream()
+          .filter(x -> !((Constraint<UnifyPair>) x).isInherited())
+          .collect(Collectors.toCollection(ArrayList::new));
+        notErased.clear();
+        notInherited.forEach(x -> notErased.addAll(typeUnifyTask.oup.smallerEqThan(x, smallerSetasList)));
+        erased = new ArrayList<>(smallerSetasList);
+        erased.removeAll(notErased);
+        nextSetAsList.removeAll(erased);
+        writeLog("Removed: " + erased);
+        writeLog("Not Removed: " + nextSetAsList);
+      }
+
+    }
+
+    return false;
+  }
+
+}

src/main/java/de/dhbwstuttgart/typeinference/unify/cartesianproduct/Variance1Case.java

@@ -1,5 +1,6 @@
 package de.dhbwstuttgart.typeinference.unify.cartesianproduct;
 
+import de.dhbwstuttgart.exceptions.UnifyCancelException;
 import de.dhbwstuttgart.typeinference.constraints.Constraint;
 import de.dhbwstuttgart.typeinference.unify.TypeUnify2Task;
 import de.dhbwstuttgart.typeinference.unify.TypeUnifyTask;
@@ -16,11 +17,11 @@ import java.util.Set;
 import java.util.concurrent.CompletableFuture;
 import java.util.stream.Collectors;
 
-public class ContravarianceCase extends VarianceCase {
+public class Variance1Case extends VarianceCase {
 
   protected final int variance = 1;
 
-  protected ContravarianceCase(boolean isOderConstraint, TypeUnifyTask typeUnifyTask, UnifyContext context) {
+  protected Variance1Case(boolean isOderConstraint, TypeUnifyTask typeUnifyTask, UnifyContext context) {
     super(isOderConstraint, typeUnifyTask, context);
   }
 
@@ -31,12 +32,12 @@ public class ContravarianceCase extends VarianceCase {
     Optional<UnifyPair> optOrigPair
   ) {
     a = typeUnifyTask.oup.max(nextSetAsList.iterator());
-    context.logger().debug("Max: a in " + variance + " " + a);
+    writeLog("Max: a in " + variance + " " + a);
     nextSetAsList.remove(a);
     if (this.isOderConstraint) {
       nextSetasListOderConstraints.add(((Constraint<UnifyPair>) a).getExtendConstraint());
     }
-    context.logger().debug(() -> "nextSetasListOderConstraints 1: " + nextSetasListOderConstraints);
+    writeLog("nextSetasListOderConstraints 1: " + nextSetasListOderConstraints);
 
     //Alle maximale Elemente in nextSetasListRest bestimmen
     //nur für diese wird parallele Berechnung angestossen.
@@ -48,7 +49,7 @@ public class ContravarianceCase extends VarianceCase {
 
 
   @Override
-  public CompletableFuture<ComputationResults> computeParallel(
+  public CompletableFuture<Tuple<Set<Set<UnifyPair>>, Set<Set<Set<UnifyPair>>>>> computeParallel(
     Set<Set<UnifyPair>> elems,
     Set<UnifyPair> eq,
     List<Set<Constraint<UnifyPair>>> oderConstraints,
@@ -60,6 +61,10 @@ public class ContravarianceCase extends VarianceCase {
     Set<Set<UnifyPair>> result,
     Set<Set<UnifyPair>> aParDef
   ) {
+    CompletableFuture<Tuple<Set<Set<UnifyPair>>, Set<Set<Set<UnifyPair>>>>> resultValues = CompletableFuture.completedFuture(new Tuple<>(
+      new HashSet<>(), new HashSet<>()
+    ));
+
     Set<UnifyPair> newEqOrig = new HashSet<>(eq);
     Set<Set<UnifyPair>> newElemsOrig = new HashSet<>(elems);
     List<Set<Constraint<UnifyPair>>> newOderConstraintsOrig = new ArrayList<>(oderConstraints);
@@ -70,25 +75,25 @@ public class ContravarianceCase extends VarianceCase {
     typeUnifyTask.addChildTask(forkOrig);
     // schedule compute() on another thread
     CompletableFuture<Set<Set<UnifyPair>>> forkOrigFuture = CompletableFuture.supplyAsync(forkOrig::compute, context.executor()).thenCompose(f -> f);
-    CompletableFuture<ComputationResults> resultValues = forkOrigFuture.thenApply(
+    resultValues = resultValues.thenCombine(forkOrigFuture,
-      (currentThreadResult) -> {
+      (prevResults, currentThreadResult) -> {
-        forkOrig.context.logger().debug("final Orig 1");
+        forkOrig.writeLog("final Orig 1");
         forkOrig.closeLogFile();
-        return new ComputationResults(currentThreadResult);
+        return new Tuple<>(currentThreadResult, prevResults.getSecond());
       });
 
     //forks.add(forkOrig);
-    if (typeUnifyTask.isExecutionCancelled()) {
+    if (typeUnifyTask.myIsCancelled()) {
-      return CompletableFuture.completedFuture(new ComputationResults());
+      throw new UnifyCancelException();
     }
     /* FORK ENDE */
 
-    context.logger().debug("a in " + variance + " " + a);
+    writeLog("a in " + variance + " " + a);
-    context.logger().debug("nextSetasListRest: " + nextSetasListRest.toString());
+    writeLog("nextSetasListRest: " + nextSetasListRest.toString());
     while (!nextSetasListRest.isEmpty()) {
       Set<UnifyPair> nSaL = nextSetasListRest.removeFirst();
       nextSetAsList.remove(nSaL);
-      context.logger().debug("1 RM" + nSaL.toString());
+      writeLog("1 RM" + nSaL.toString());
 
       if (!this.isOderConstraint) {
         //ueberpruefung ob zu a =. ty \in nSaL in sameEqSet ein Widerspruch besteht
@@ -109,23 +114,23 @@ public class ContravarianceCase extends VarianceCase {
       CompletableFuture<Set<Set<UnifyPair>>> forkFuture = CompletableFuture.supplyAsync(fork::compute, context.executor()).thenCompose(f -> f);
       resultValues = resultValues.thenCombine(forkFuture,
         (prevResults, fork_res) -> {
-          if (typeUnifyTask.isExecutionCancelled()) {
+          if (typeUnifyTask.myIsCancelled()) {
-            return new ComputationResults();
+            throw new UnifyCancelException();
           }
-          context.logger().debug("fork_res: " + fork_res.toString());
+          writeLog("fork_res: " + fork_res.toString());
-          context.logger().debug(Boolean.valueOf((typeUnifyTask.isUndefinedPairSetSet(fork_res))).toString());
+          writeLog(Boolean.valueOf((typeUnifyTask.isUndefinedPairSetSet(fork_res))).toString());
-          prevResults.addForkResult(fork_res);
+          prevResults.getSecond().add(fork_res);
           if (!typeUnifyTask.isUndefinedPairSetSet(fork_res)) {
             aParDef.add(fork.getNextSetElement());
           }
-          fork.context.logger().debug("final 1");
+          fork.writeLog("final 1");
           fork.closeLogFile();
         return prevResults;
         }
       );
 
-      if (typeUnifyTask.isExecutionCancelled()) {
+      if (typeUnifyTask.myIsCancelled()) {
-        return CompletableFuture.completedFuture(new ComputationResults());
+        throw new UnifyCancelException();
       }
     }
 
@@ -141,7 +146,7 @@ public class ContravarianceCase extends VarianceCase {
   ) {
     int resOfCompare = typeUnifyTask.oup.compare(compResult, compRes);
     if (resOfCompare == -1) {
-      context.logger().debug("Geloescht result: " + result);
+      writeLog("Geloescht result: " + result);
       result.clear();
       result.addAll(currentThreadResult);
     }
@@ -149,7 +154,7 @@ public class ContravarianceCase extends VarianceCase {
       result.addAll(currentThreadResult);
     }
     else if (resOfCompare == 1) {
-      context.logger().debug("Geloescht currentThreadResult: " + currentThreadResult);
+      writeLog("Geloescht currentThreadResult: " + currentThreadResult);
       //result = result;
     }
   }
@@ -160,35 +165,35 @@ public class ContravarianceCase extends VarianceCase {
     Set<Set<UnifyPair>> aParDef,
     List<Set<UnifyPair>> nextSetAsList
   ) {
-    // context.logger().info("");
+    // System.out.println("");
-    context.logger().debug("a: " + rekTiefe + " variance: " + variance + a.toString());
+    writeLog("a: " + rekTiefe + " variance: " + variance + a.toString());
-    context.logger().debug("aParDef: " + aParDef.toString());
+    writeLog("aParDef: " + aParDef.toString());
     aParDef.add(a);
     Iterator<Set<UnifyPair>> aParDefIt = aParDef.iterator();
     if (this.isOderConstraint) {
       nextSetAsList.removeAll(nextSetasListOderConstraints);
       nextSetasListOderConstraints = new ArrayList<>();
-      context.logger().debug("Removed: " + nextSetasListOderConstraints);
+      writeLog("Removed: " + nextSetasListOderConstraints);
       while (aParDefIt.hasNext()) {
         Set<UnifyPair> a_new = aParDefIt.next();
         List<Set<UnifyPair>> smallerSetasList = typeUnifyTask.oup.smallerThan(a_new, nextSetAsList);
-        context.logger().debug("smallerSetasList: " + smallerSetasList);
+        writeLog("smallerSetasList: " + smallerSetasList);
         List<Set<UnifyPair>> notInherited = smallerSetasList.stream()
           .filter(x -> !((Constraint<UnifyPair>) x).isInherited() && !((Constraint<UnifyPair>) x).isImplemented())
           .collect(Collectors.toCollection(ArrayList::new));
-        context.logger().debug("notInherited: " + notInherited + "\n");
+        writeLog("notInherited: " + notInherited + "\n");
         List<Set<UnifyPair>> notErased = new ArrayList<>();
         notInherited.forEach(x -> {
           notErased.addAll(typeUnifyTask.oup.smallerEqThan(x, smallerSetasList));
         });
         List<Set<UnifyPair>> erased = new ArrayList<>(smallerSetasList);
-        context.logger().debug("notErased: " + notErased + "\n");
+        writeLog("notErased: " + notErased + "\n");
         erased.removeAll(notErased);
         nextSetAsList.removeAll(erased);
 
-        context.logger().debug("Removed: " + erased);
+        writeLog("Removed: " + erased);
 
-        context.logger().debug("Not Removed: " + nextSetAsList);
+        writeLog("Not Removed: " + nextSetAsList);
 
       }
     } else {
@@ -198,9 +203,9 @@ public class ContravarianceCase extends VarianceCase {
         List<Set<UnifyPair>> erased = typeUnifyTask.oup.smallerEqThan(a_new, nextSetAsList);
         nextSetAsList.removeAll(erased);
 
-        context.logger().debug("Removed: " + erased);
+        writeLog("Removed: " + erased);
 
-        context.logger().debug("Not Removed: " + nextSetAsList);
+        writeLog("Not Removed: " + nextSetAsList);
       }
     }
 

src/main/java/de/dhbwstuttgart/typeinference/unify/cartesianproduct/Variance2Case.java

@@ -1,5 +1,6 @@
 package de.dhbwstuttgart.typeinference.unify.cartesianproduct;
 
+import de.dhbwstuttgart.exceptions.UnifyCancelException;
 import de.dhbwstuttgart.typeinference.constraints.Constraint;
 import de.dhbwstuttgart.typeinference.unify.TypeUnify2Task;
 import de.dhbwstuttgart.typeinference.unify.TypeUnifyTask;
@@ -14,12 +15,11 @@ import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.CompletableFuture;
 
-public class InvarianceOrConstraintCase extends VarianceCase {
+public class Variance2Case extends VarianceCase {
 
-  // either for invariance or for oderConstraints
   protected final int variance = 2;
 
-  protected InvarianceOrConstraintCase(boolean isOderConstraint, TypeUnifyTask typeUnifyTask, UnifyContext context) {
+  protected Variance2Case(boolean isOderConstraint, TypeUnifyTask typeUnifyTask, UnifyContext context) {
     super(isOderConstraint, typeUnifyTask, context);
   }
 
@@ -37,7 +37,7 @@ public class InvarianceOrConstraintCase extends VarianceCase {
 
 
   @Override
-  public CompletableFuture<ComputationResults> computeParallel(
+  public CompletableFuture<Tuple<Set<Set<UnifyPair>>, Set<Set<Set<UnifyPair>>>>> computeParallel(
     Set<Set<UnifyPair>> elems,
     Set<UnifyPair> eq,
     List<Set<Constraint<UnifyPair>>> oderConstraints,
@@ -49,7 +49,9 @@ public class InvarianceOrConstraintCase extends VarianceCase {
     Set<Set<UnifyPair>> result,
     Set<Set<UnifyPair>> aParDef
   ) {
-    context.logger().debug("var2einstieg");
+    CompletableFuture<Tuple<Set<Set<UnifyPair>>, Set<Set<Set<UnifyPair>>>>> resultValuesFuture;
+
+    writeLog("var2einstieg");
     Set<TypeUnify2Task> forks = new HashSet<>();
     Set<UnifyPair> newEqOrig = new HashSet<>(eq);
     Set<Set<UnifyPair>> newElemsOrig = new HashSet<>(elems);
@@ -60,19 +62,18 @@ public class InvarianceOrConstraintCase extends VarianceCase {
     TypeUnify2Task forkOrig = new TypeUnify2Task(newElemsOrig, newEqOrig, newOderConstraintsOrig, a, fc, context, rekTiefe, new HashSet<>(methodSignatureConstraint));
     typeUnifyTask.addChildTask(forkOrig);
     CompletableFuture<Set<Set<UnifyPair>>> forkOrigFuture = CompletableFuture.supplyAsync(forkOrig::compute, context.executor()).thenCompose(f -> f);
-    CompletableFuture<ComputationResults> resultValues = forkOrigFuture.thenApply((currentThreadResult) -> {
+    resultValuesFuture = forkOrigFuture.thenApply((currentThreadResult) -> {
-      forkOrig.context.logger().debug("final Orig 2");
+      forkOrig.writeLog("final Orig 2");
       forkOrig.closeLogFile();
-      return new ComputationResults(currentThreadResult);
+      return new Tuple<>(currentThreadResult, new HashSet<>());
     });
-
+    if (typeUnifyTask.myIsCancelled()) {
-    if (typeUnifyTask.isExecutionCancelled()) {
+      throw new UnifyCancelException();
-      return resultValues;
     }
     /* FORK ENDE */
 
-    context.logger().debug(() -> "a in " + variance + " " + a);
+    writeLog("a in " + variance + " " + a);
-    context.logger().debug(() -> "nextSetasListRest: " + nextSetasListRest.toString());
+    writeLog("nextSetasListRest: " + nextSetasListRest.toString());
 
     //Fuer parallele Berechnung der Oder-Contraints wird methodSignature kopiert
     //und jeweils die methodSignature von a bzw. nSaL wieder gelöscht, wenn es keine Lösung ist.
@@ -91,22 +92,26 @@ public class InvarianceOrConstraintCase extends VarianceCase {
       TypeUnify2Task fork = new TypeUnify2Task(newElems, newEq, newOderConstraints, nSaL, fc, context, rekTiefe, new HashSet<>(methodSignatureConstraintForParallel));
       typeUnifyTask.addChildTask(fork);
       CompletableFuture<Set<Set<UnifyPair>>> forkFuture = CompletableFuture.supplyAsync(fork::compute, context.executor()).thenCompose(f -> f);
-      resultValues = resultValues.thenCombine(forkFuture, (prevResults, fork_res) -> {
+      resultValuesFuture = resultValuesFuture.thenCombine(forkFuture, (resultValues, fork_res) -> {
-        if (typeUnifyTask.isExecutionCancelled()) {
+        if (typeUnifyTask.myIsCancelled()) {
-          return prevResults;
+          throw new UnifyCancelException();
         }
-        prevResults.addForkResult(fork_res);
+        resultValues.getSecond().add(fork_res);
-        fork.context.logger().debug("final 2");
+        fork.writeLog("final 2");
         fork.closeLogFile();
-        return prevResults;
+        return resultValues;
       });
 
-      if (typeUnifyTask.isExecutionCancelled()) {
+      if (typeUnifyTask.myIsCancelled()) {
-        return resultValues;
+        throw new UnifyCancelException();
       }
     }
 
-    return resultValues;
+    if (typeUnifyTask.myIsCancelled()) {
+      throw new UnifyCancelException();
+    }
+
+    return resultValuesFuture;
   }
 
   @Override

src/main/java/de/dhbwstuttgart/typeinference/unify/cartesianproduct/VarianceCase.java

@@ -5,9 +5,9 @@ import de.dhbwstuttgart.typeinference.unify.TypeUnifyTask;
 import de.dhbwstuttgart.typeinference.unify.UnifyContext;
 import de.dhbwstuttgart.typeinference.unify.interfaces.IFiniteClosure;
 import de.dhbwstuttgart.typeinference.unify.model.UnifyPair;
+import de.dhbwstuttgart.util.Logger;
 import de.dhbwstuttgart.util.Tuple;
 import java.util.ArrayList;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Optional;
 import java.util.Set;
@@ -17,11 +17,11 @@ public abstract class VarianceCase {
 
   public static VarianceCase createFromVariance(int variance, boolean isOderConstraint, TypeUnifyTask typeUnifyTask, UnifyContext context) {
     return switch (variance) {
-      case 0    -> new UnknownVarianceCase(isOderConstraint, typeUnifyTask, context);
+      case 0 -> new Variance0Case(isOderConstraint, typeUnifyTask, context);
-      case 1    -> new ContravarianceCase(isOderConstraint, typeUnifyTask, context);
+      case 1 -> new Variance1Case(isOderConstraint, typeUnifyTask, context);
-      case -1   -> new CovarianceCase(isOderConstraint, typeUnifyTask, context);
+      case -1 -> new VarianceM1Case(isOderConstraint, typeUnifyTask, context);
-      case 2    -> new InvarianceOrConstraintCase(isOderConstraint, typeUnifyTask, context);
+      case 2 -> new Variance2Case(isOderConstraint, typeUnifyTask, context);
-      default   -> throw new RuntimeException("Invalid variance: " + variance);
+      default -> throw new RuntimeException("Invalid variance: " + variance);
     };
   }
 
@@ -72,7 +72,7 @@ public abstract class VarianceCase {
   /**
    *
    */
-  public abstract CompletableFuture<ComputationResults> computeParallel(
+  public abstract CompletableFuture<Tuple<Set<Set<UnifyPair>>, Set<Set<Set<UnifyPair>>>>> computeParallel(
     Set<Set<UnifyPair>> elems,
     Set<UnifyPair> eq,
     List<Set<Constraint<UnifyPair>>> oderConstraints,
@@ -105,28 +105,8 @@ public abstract class VarianceCase {
     List<Set<UnifyPair>> nextSetAsList
   );
 
-  /**
+  protected void writeLog(String s) {
-   * Wrapper class for the parallel computation results
+    typeUnifyTask.writeLog(s);
-   */
-  public static class ComputationResults {
-    public Set<Set<UnifyPair>> mainResult;
-    public Set<Set<Set<UnifyPair>>> forkResults;
-
-    public ComputationResults() {
-      this(new HashSet<>(), new HashSet<>());
-    }
-
-    public ComputationResults(Set<Set<UnifyPair>> mainResult) {
-      this(mainResult, new HashSet<>());
-    }
-
-    public ComputationResults(Set<Set<UnifyPair>> mainResult, Set<Set<Set<UnifyPair>>> forkResults) {
-      this.mainResult = mainResult;
-      this.forkResults = forkResults;
-    }
-
-    void addForkResult(Set<Set<UnifyPair>> forkResult) {
-      forkResults.add(forkResult);
-    }
   }
+
 }

src/main/java/de/dhbwstuttgart/typeinference/unify/cartesianproduct/VarianceM1Case.java

@@ -1,5 +1,6 @@
 package de.dhbwstuttgart.typeinference.unify.cartesianproduct;
 
+import de.dhbwstuttgart.exceptions.UnifyCancelException;
 import de.dhbwstuttgart.typeinference.constraints.Constraint;
 import de.dhbwstuttgart.typeinference.unify.TypeUnify2Task;
 import de.dhbwstuttgart.typeinference.unify.TypeUnifyTask;
@@ -16,11 +17,11 @@ import java.util.Set;
 import java.util.concurrent.CompletableFuture;
 import java.util.stream.Collectors;
 
-public class CovarianceCase extends VarianceCase {
+public class VarianceM1Case extends VarianceCase {
 
   protected final int variance = -1;
 
-  protected CovarianceCase(boolean isOderConstraint, TypeUnifyTask typeUnifyTask, UnifyContext context) {
+  protected VarianceM1Case(boolean isOderConstraint, TypeUnifyTask typeUnifyTask, UnifyContext context) {
     super(isOderConstraint, typeUnifyTask, context);
   }
 
@@ -31,11 +32,11 @@ public class CovarianceCase extends VarianceCase {
     Optional<UnifyPair> optOrigPair
   ) {
     a = typeUnifyTask.oup.min(nextSetAsList.iterator());
-    context.logger().debug(() -> "Min: a in " + variance + " " + a);
+    writeLog("Min: a in " + variance + " " + a);
     if (this.isOderConstraint) {
       nextSetasListOderConstraints.add(((Constraint<UnifyPair>) a).getExtendConstraint());
     }
-    context.logger().debug(() -> "nextSetasListOderConstraints -1: " + nextSetasListOderConstraints);
+    writeLog("nextSetasListOderConstraints -1: " + nextSetasListOderConstraints);
     nextSetAsList.remove(a);
 
     //Alle minimalen Elemente in nextSetasListRest bestimmen
@@ -48,7 +49,7 @@ public class CovarianceCase extends VarianceCase {
 
 
   @Override
-  public CompletableFuture<ComputationResults> computeParallel(
+  public CompletableFuture<Tuple<Set<Set<UnifyPair>>, Set<Set<Set<UnifyPair>>>>> computeParallel(
     Set<Set<UnifyPair>> elems,
     Set<UnifyPair> eq,
     List<Set<Constraint<UnifyPair>>> oderConstraints,
@@ -60,6 +61,10 @@ public class CovarianceCase extends VarianceCase {
     Set<Set<UnifyPair>> result,
     Set<Set<UnifyPair>> aParDef
   ) {
+    CompletableFuture<Tuple<Set<Set<UnifyPair>>, Set<Set<Set<UnifyPair>>>>> resultValues = CompletableFuture.completedFuture(new Tuple<>(
+      new HashSet<>(), new HashSet<>()
+    ));
+
     Set<UnifyPair> newEqOrig = new HashSet<>(eq);
     Set<Set<UnifyPair>> newElemsOrig = new HashSet<>(elems);
     List<Set<Constraint<UnifyPair>>> newOderConstraintsOrig = new ArrayList<>(oderConstraints);
@@ -70,26 +75,26 @@ public class CovarianceCase extends VarianceCase {
     typeUnifyTask.addChildTask(forkOrig);
     // schedule compute() on another thread
     CompletableFuture<Set<Set<UnifyPair>>> forkOrigFuture = CompletableFuture.supplyAsync(forkOrig::compute, context.executor()).thenCompose(f -> f);
-    CompletableFuture<ComputationResults> resultValues = forkOrigFuture.thenApply(
+    resultValues = resultValues.thenCombine(forkOrigFuture,
-      (currentThreadResult) -> {
+      (prevResults, currentThreadResult) -> {
-        forkOrig.context.logger().debug("final Orig -1");
+        forkOrig.writeLog("final Orig -1");
         forkOrig.closeLogFile();
-        return new ComputationResults(currentThreadResult);
+        return new Tuple<>(currentThreadResult, prevResults.getSecond());
       });
 
     //forks.add(forkOrig);
-    if (typeUnifyTask.isExecutionCancelled()) {
+    if (typeUnifyTask.myIsCancelled()) {
-      return resultValues;
+      throw new UnifyCancelException();
     }
     /* FORK ENDE */
 
-    context.logger().debug(() -> "a in " + variance + " " + a);
+    writeLog("a in " + variance + " " + a);
-    context.logger().debug(() -> "nextSetasListRest: " + nextSetasListRest.toString());
+    writeLog("nextSetasListRest: " + nextSetasListRest.toString());
 
     while (!nextSetasListRest.isEmpty()) {
       Set<UnifyPair> nSaL = nextSetasListRest.removeFirst();
       nextSetAsList.remove(nSaL);
-      context.logger().debug(() -> "-1 RM" + nSaL.toString());
+      writeLog("-1 RM" + nSaL.toString());
 
       if (!this.isOderConstraint) {
         //ueberpruefung ob zu a =. ty \in nSaL in sameEqSet ein Widerspruch besteht
@@ -110,23 +115,23 @@ public class CovarianceCase extends VarianceCase {
       CompletableFuture<Set<Set<UnifyPair>>> forkFuture = CompletableFuture.supplyAsync(fork::compute, context.executor()).thenCompose(f -> f);
       resultValues = resultValues.thenCombine(forkFuture,
         (prevResults, fork_res) -> {
-          if (typeUnifyTask.isExecutionCancelled()) {
+          if (typeUnifyTask.myIsCancelled()) {
-            return prevResults;
+            throw new UnifyCancelException();
           }
-          context.logger().debug(() -> "fork_res: " + fork_res.toString());
+          writeLog("fork_res: " + fork_res.toString());
-          context.logger().debug(() -> Boolean.valueOf((typeUnifyTask.isUndefinedPairSetSet(fork_res))).toString());
+          writeLog(Boolean.valueOf((typeUnifyTask.isUndefinedPairSetSet(fork_res))).toString());
-          prevResults.addForkResult(fork_res);
+          prevResults.getSecond().add(fork_res);
           if (!typeUnifyTask.isUndefinedPairSetSet(fork_res)) {
             aParDef.add(fork.getNextSetElement());
           }
-          fork.context.logger().debug("final -1");
+          fork.writeLog("final -1");
           fork.closeLogFile();
         return prevResults;
         }
       );
 
-      if (typeUnifyTask.isExecutionCancelled()) {
+      if (typeUnifyTask.myIsCancelled()) {
-        return resultValues;
+        throw new UnifyCancelException();
       }
     }
 
@@ -143,13 +148,13 @@ public class CovarianceCase extends VarianceCase {
   ) {
     int resOfCompare = typeUnifyTask.oup.compare(compResult, compRes);
     if (resOfCompare == 1) {
-      context.logger().debug(() -> "Geloescht result: " + result);
+      writeLog("Geloescht result: " + result);
       result.clear();
       result.addAll(currentThreadResult);
     } else if (resOfCompare == 0) {
       result.addAll(currentThreadResult);
     } else if (resOfCompare == -1) {
-      context.logger().debug(() -> "Geloescht currentThreadResult: " + currentThreadResult);
+      writeLog("Geloescht currentThreadResult: " + currentThreadResult);
       //result = result;
     }
   }
@@ -161,14 +166,14 @@ public class CovarianceCase extends VarianceCase {
     List<Set<UnifyPair>> nextSetAsList
   ) {
 
-    // context.logger().info("");
+    // System.out.println("");
-    context.logger().debug(() -> "a: " + rekTiefe + " variance: " + variance + a.toString());
+    writeLog("a: " + rekTiefe + " variance: " + variance + a.toString());
-    context.logger().debug(() -> "aParDef: " + aParDef.toString());
+    writeLog("aParDef: " + aParDef.toString());
     aParDef.add(a);
     Iterator<Set<UnifyPair>> aParDefIt = aParDef.iterator();
     if (this.isOderConstraint) {
       nextSetAsList.removeAll(nextSetasListOderConstraints);
-      context.logger().debug(() -> "Removed: " + nextSetasListOderConstraints);
+      writeLog("Removed: " + nextSetasListOderConstraints);
       nextSetasListOderConstraints = new ArrayList<>();
       while (aParDefIt.hasNext()) {
         Set<UnifyPair> a_new = aParDefIt.next();
@@ -201,9 +206,9 @@ public class CovarianceCase extends VarianceCase {
         erased.removeAll(notErased);
         nextSetAsList.removeAll(erased);
 
-        context.logger().debug(() -> "Removed: " + erased);
+        writeLog("Removed: " + erased);
 
-        context.logger().debug(() -> "Not Removed: " + nextSetAsList);
+        writeLog("Not Removed: " + nextSetAsList);
 
       }
     } else {
@@ -214,9 +219,9 @@ public class CovarianceCase extends VarianceCase {
 
         nextSetAsList.removeAll(erased);
 
-        context.logger().debug(() -> "Removed: " + erased);
+        writeLog("Removed: " + erased);
 
-        context.logger().debug(() -> "Not Removed: " + nextSetAsList);
+        writeLog("Not Removed: " + nextSetAsList);
       }
     }
 

src/main/java/de/dhbwstuttgart/typeinference/unify/distributeVariance.java

@@ -12,12 +12,15 @@ import de.dhbwstuttgart.typeinference.unify.model.UnifyType;
 
 public class distributeVariance extends visitUnifyTypeVisitor<Integer> {
 	
-	public static int inverseVariance(int variance) {
+	public static int inverseVariance(int variance) { 
-		return switch (variance) {
+		Integer ret = 0;
-			case 1 -> -1;
+		if (variance == 1) {
-			case -1 -> 1;
+		   ret = -1;
-			default -> 0;
+		}
-		};
+		if (variance == -1) {
+			ret = 1;
+		}
+		return ret;
 	}
 
 
@@ -39,7 +42,7 @@ public class distributeVariance extends visitUnifyTypeVisitor<Integer> {
 		List<UnifyType> param = new ArrayList<>(funnty.getTypeParams().get().length);
 		param.addAll(Arrays.asList(funnty.getTypeParams().get()));
 		UnifyType resultType = param.remove(param.size()-1);
-		int htInverse = inverseVariance(ht);
+		Integer htInverse = inverseVariance(ht);
 		param = param.stream()
 				     .map(x -> x.accept(this, htInverse))
 				     .collect(Collectors.toCollection(ArrayList::new));

src/main/java/de/dhbwstuttgart/typeinference/unify/model/ExtendsType.java

@@ -24,6 +24,9 @@ public final class ExtendsType extends WildcardType implements ISerializableData
 	 */
 	public ExtendsType(UnifyType extendedType) {
 		super("? extends " + extendedType.getName(), extendedType);
+		if (extendedType instanceof ExtendsType) {
+			System.out.print("");
+		}
 	}
 
 	/**

src/main/java/de/dhbwstuttgart/typeinference/unify/model/FunNType.java

@@ -81,7 +81,7 @@ public class FunNType extends UnifyType implements ISerializableData {
 	}
 
 	@Override
-	public boolean wrongWildcard() {
+	public Boolean wrongWildcard() {
 		return (new ArrayList<UnifyType>(Arrays.asList(getTypeParams()
 				.get())).stream().filter(x -> (x instanceof WildcardType)).findFirst().isPresent());
 	}

src/main/java/de/dhbwstuttgart/typeinference/unify/model/Node.java

@@ -53,7 +53,7 @@ class Node<T> {
 			addDescendant(descendant);
 		}
 	}
-
+	
 	/**
 	 * Adds a directed edge from the predecessor to this node (predecessor -> this)
 	 */
@@ -73,7 +73,7 @@ class Node<T> {
 			addPredecessor(predecessor);
 		}
 	}
-
+	
 	/**
 	 * The content of this node.
 	 */

src/main/java/de/dhbwstuttgart/typeinference/unify/model/OrderingUnifyPair.java

@@ -48,7 +48,12 @@ public class OrderingUnifyPair extends OrderingExtend<Set<UnifyPair>> {
 				return fc.compare(left.getRhsType(), right.getRhsType(), PairOperator.SMALLERDOT, context);
 		}}
 		catch (ClassCastException e) {
-			((FiniteClosure)fc).logger.debug(() -> "ClassCastException: " + left.toString() + " " + left.getGroundBasePair() + "\n\n");
+			try {
+			((FiniteClosure)fc).logFile.write("ClassCastException: " + left.toString() + " " + left.getGroundBasePair() + "\n\n");
+			 // ((FiniteClosure)fc).logFile.flush();
+			}
+			catch (IOException ie) {
+			}
 			return -99;
 		}
 	}
@@ -56,7 +61,7 @@ public class OrderingUnifyPair extends OrderingExtend<Set<UnifyPair>> {
 	/*
 	public int compareEq (UnifyPair left, UnifyPair right) {
 		if (left == null || right == null)
-			context.logger().info("Fehler");
+			System.out.println("Fehler");
 		if (left.getLhsType() instanceof PlaceholderType) {
 			return fc.compare(left.getRhsType(), right.getRhsType(), left.getPairOp());
 		}
@@ -77,12 +82,12 @@ public class OrderingUnifyPair extends OrderingExtend<Set<UnifyPair>> {
 						&& (((ExtendsType)right).getExtendedType().getName().equals("java.util.Vector"))
 						&& (((ReferenceType)((ExtendsType)right).getExtendedType()).getTypeParams().iterator().next() instanceof ExtendsType)))
 				{
-					// context.logger().info("");
+					// System.out.println("");
 				}
 				if (((right instanceof SuperType) && (((SuperType)right).getSuperedType().getName().equals("java.lang.Object")))
 		||((left instanceof SuperType) && (((SuperType)left).getSuperedType().getName().equals("java.lang.Object"))))
 {
-						// context.logger().info("");
+						// System.out.println("");
 					}
 		}
 			else	 {
@@ -104,11 +109,11 @@ public class OrderingUnifyPair extends OrderingExtend<Set<UnifyPair>> {
 						&& (((ExtendsType)right).getExtendedType().getName().equals("java.util.Vector"))
 						&& (((ReferenceType)((ExtendsType)right).getExtendedType()).getTypeParams().iterator().next() instanceof ExtendsType)))
 				{
-					// context.logger().info("");
+					// System.out.println("");
 				}
 				if (right instanceof SuperType) 
 					{
-						// context.logger().info("");
+						// System.out.println("");
 					}
 			}
 				else	 {
@@ -170,81 +175,85 @@ public class OrderingUnifyPair extends OrderingExtend<Set<UnifyPair>> {
 		left.add(p2);
 		left.add(p4);
 		*/
+		
 
-		Set<UnifyPair> lefteq = new HashSet<>();
+		Set<UnifyPair> lefteq = left.stream()
-		Set<UnifyPair> leftle = new HashSet<>();
+				.filter(x -> (x.getLhsType() instanceof PlaceholderType && x.getPairOp() == PairOperator.EQUALSDOT))
-		Set<UnifyPair> leftlewc = new HashSet<>();
+				.collect(Collectors.toCollection(HashSet::new));
-		Set<UnifyPair> lefteqOder = new HashSet<>();
+		Set<UnifyPair> righteq = right.stream()
-		Set<UnifyPair> lefteqRet = new HashSet<>();
+				.filter(x -> (x.getLhsType() instanceof PlaceholderType && x.getPairOp() == PairOperator.EQUALSDOT))
-		Set<UnifyPair> leftleOder = new HashSet<>();
+				.collect(Collectors.toCollection(HashSet::new));
-		for (var x : left) {
+		Set<UnifyPair> leftle = left.stream()
-			boolean isLeftPlaceholder = x.getLhsType() instanceof PlaceholderType;
+				.filter(x -> ((x.getLhsType() instanceof PlaceholderType || x.getRhsType() instanceof PlaceholderType) 
-			boolean isRightPlaceholder = x.getRhsType() instanceof PlaceholderType;
+						      && x.getPairOp() == PairOperator.SMALLERDOT))
-			boolean hasPlaceholder = isLeftPlaceholder || isRightPlaceholder;
+				.collect(Collectors.toCollection(HashSet::new));
-
+		Set<UnifyPair> rightle = right.stream()
-			if (isLeftPlaceholder && x.getPairOp() == PairOperator.EQUALSDOT) lefteq.add(x);
+				.filter(x -> ((x.getLhsType() instanceof PlaceholderType || x.getRhsType() instanceof PlaceholderType) 
-			if (hasPlaceholder && x.getPairOp() == PairOperator.SMALLERDOT) leftle.add(x);
+						      && x.getPairOp() == PairOperator.SMALLERDOT))
-			if (hasPlaceholder && x.getPairOp() == PairOperator.SMALLERDOTWC) leftlewc.add(x);
+				.collect(Collectors.toCollection(HashSet::new));
-
+		Set<UnifyPair> leftlewc = left.stream()
-			UnifyPair y = x.getGroundBasePair();
+				.filter(x -> ((x.getLhsType() instanceof PlaceholderType || x.getRhsType() instanceof PlaceholderType) 
-			boolean isBasePairLeftPlaceholder = y.getLhsType() instanceof PlaceholderType;
+						      && x.getPairOp() == PairOperator.SMALLERDOTWC))
-			boolean isBasePairRightPlaceholder = y.getRhsType() instanceof PlaceholderType;
+				.collect(Collectors.toCollection(HashSet::new));
-			if (isBasePairLeftPlaceholder && !isBasePairRightPlaceholder && x.getPairOp() == PairOperator.EQUALSDOT) {
+		Set<UnifyPair> rightlewc = right.stream()
-				lefteqOder.add(x);
+				.filter(x -> ((x.getLhsType() instanceof PlaceholderType || x.getRhsType() instanceof PlaceholderType) 
-			}
+						      && x.getPairOp() == PairOperator.SMALLERDOTWC))
-			else if (isBasePairRightPlaceholder && ((PlaceholderType)y.getRhsType()).getOrCons() == (byte)-1) {
+				.collect(Collectors.toCollection(HashSet::new));
-				lefteqRet.add(x);
+		//System.out.println(left.toString());
-			}
-			else if (x.getPairOp() == PairOperator.SMALLERDOT) {
-				leftleOder.add(x);
-			}
-		}
-
-
-		Set<UnifyPair> righteq = new HashSet<>();
-		Set<UnifyPair> rightle = new HashSet<>();
-		Set<UnifyPair> rightlewc = new HashSet<>();
-		Set<UnifyPair> righteqOder = new HashSet<>();
-		Set<UnifyPair> righteqRet = new HashSet<>();
-		Set<UnifyPair> rightleOder = new HashSet<>();
-		for (var x : right) {
-			boolean isLeftPlaceholder = x.getLhsType() instanceof PlaceholderType;
-			boolean isRightPlaceholder = x.getRhsType() instanceof PlaceholderType;
-			boolean hasPlaceholder = isLeftPlaceholder || isRightPlaceholder;
-
-			if (isLeftPlaceholder && x.getPairOp() == PairOperator.EQUALSDOT) righteq.add(x);
-			if (hasPlaceholder && x.getPairOp() == PairOperator.SMALLERDOT) 	rightle.add(x);
-			if (hasPlaceholder && x.getPairOp() == PairOperator.SMALLERDOTWC) rightlewc.add(x);
-
-			UnifyPair y = x.getGroundBasePair();
-			boolean isBasePairLeftPlaceholder = y.getLhsType() instanceof PlaceholderType;
-			boolean isBasePairRightPlaceholder = y.getRhsType() instanceof PlaceholderType;
-			if (isBasePairLeftPlaceholder && !isBasePairRightPlaceholder && x.getPairOp() == PairOperator.EQUALSDOT) {
-				righteqOder.add(x);
-			}
-			else if (isBasePairRightPlaceholder && ((PlaceholderType)y.getRhsType()).getOrCons() == (byte)-1) {
-				righteqRet.add(x);
-			}
-			else if (x.getPairOp() == PairOperator.SMALLERDOT) {
-				rightleOder.add(x);
-			}
-		}
-
-		//context.logger().info(left.toString());
 		//Fall 2
 		//if (lefteq.iterator().next().getLhsType().getName().equals("AJO")) {
 		//	System.out.print("");
 		//}
 		
 		//ODER-CONSTRAINT
-		// Set<UnifyPair> leftBase = left.stream().map(x -> x.getGroundBasePair()).collect(Collectors.toCollection(HashSet::new));
+		Set<UnifyPair> leftBase = left.stream().map(x -> x.getGroundBasePair()).collect(Collectors.toCollection(HashSet::new));
-		// Set<UnifyPair> rightBase = right.stream().map(x -> x.getGroundBasePair()).collect(Collectors.toCollection(HashSet::new));
+		Set<UnifyPair> rightBase = right.stream().map(x -> x.getGroundBasePair()).collect(Collectors.toCollection(HashSet::new));
 
+		Set<UnifyPair> lefteqOder = left.stream()
+				.filter(x -> { UnifyPair y = x.getGroundBasePair();
+				/*try {
+					((FiniteClosure)fc).logFile.write("leftBase: " + leftBase.toString() +"\n");
+					((FiniteClosure)fc).logFile.write("rightBase: " + rightBase.toString() +"\n\n");
+					((FiniteClosure)fc).logFile.write("left: " + left.toString() +"\n");
+					((FiniteClosure)fc).logFile.write("right: " + right.toString() +"\n\n");
+					((FiniteClosure)fc).logFile.write("y: " + y.toString() +"\n");
+					((FiniteClosure)fc).logFile.write("y.getLhsType() : " + y.getLhsType() .toString() +"\n\n");
+					((FiniteClosure)fc).logFile.write("y.getRhsType(): " + y.getRhsType().toString() +"\n");
+					((FiniteClosure)fc).logFile.write("x.getPairOp(): " + x.getPairOp().toString() +"\n\n");
+					}
+					catch (IOException ie) {
+					}	*/
+	               return (y.getLhsType() instanceof PlaceholderType && 
+	            		   !(y.getRhsType() instanceof PlaceholderType) && 
+	            		   x.getPairOp() == PairOperator.EQUALSDOT);})
+				.collect(Collectors.toCollection(HashSet::new));
 		left.removeAll(lefteqOder);
-		left.removeAll(lefteqRet);
+		Set<UnifyPair> righteqOder = right.stream()
+				.filter(x -> { UnifyPair y = x.getGroundBasePair(); 
+	               return (y.getLhsType() instanceof PlaceholderType && 
+	            		   !(y.getRhsType() instanceof PlaceholderType) && 
+	            		   x.getPairOp() == PairOperator.EQUALSDOT);})
+				.collect(Collectors.toCollection(HashSet::new));
 		right.removeAll(righteqOder);
+		Set<UnifyPair> lefteqRet = left.stream()
+				.filter(x -> { UnifyPair y = x.getGroundBasePair(); 
+	               return (y.getRhsType() instanceof PlaceholderType && 
+	            		   ((PlaceholderType)y.getRhsType()).getOrCons() == (byte)-1);})
+				.collect(Collectors.toCollection(HashSet::new));
+		left.removeAll(lefteqRet);
+		Set<UnifyPair> righteqRet = right.stream()
+				.filter(x -> { UnifyPair y = x.getGroundBasePair(); 
+	               return (y.getRhsType() instanceof PlaceholderType && 
+	            		   ((PlaceholderType)y.getRhsType()).getOrCons() == (byte)-1);})
+				.collect(Collectors.toCollection(HashSet::new));
 		right.removeAll(righteqRet);
-
+		Set<UnifyPair> leftleOder = left.stream()
+				.filter(x -> (x.getPairOp() == PairOperator.SMALLERDOT))
+				.collect(Collectors.toCollection(HashSet::new));
+		Set<UnifyPair> rightleOder = right.stream()
+				.filter(x -> (x.getPairOp() == PairOperator.SMALLERDOT))
+				.collect(Collectors.toCollection(HashSet::new));
+		
 		/*
 		synchronized(this) {
 					try {
@@ -266,73 +275,89 @@ public class OrderingUnifyPair extends OrderingExtend<Set<UnifyPair>> {
 		*/
 		
 		
-		int compareEq;
+		Integer compareEq;
 		if (lefteqOder.size() == 1 && righteqOder.size() == 1 && lefteqRet.size() == 1 && righteqRet.size() == 1) {
 			Match m = new Match();
-			compareEq = compareEq(lefteqOder.iterator().next().getGroundBasePair(), righteqOder.iterator().next().getGroundBasePair());
+			if ((compareEq = compareEq(lefteqOder.iterator().next().getGroundBasePair(), righteqOder.iterator().next().getGroundBasePair())) == -1) {
-
+				ArrayList<UnifyPair> matchList = 
-			if (compareEq == -1) {
+						rightleOder.stream().map(x -> { 
-				ArrayList<UnifyPair> matchList =
+							UnifyPair leftElem = leftleOder.stream()
-						rightleOder.stream().map(x -> {
-								UnifyPair leftElem = leftleOder.stream()
 														     .filter(y -> y.getGroundBasePair().getLhsType().equals(x.getGroundBasePair().getLhsType()))
-														     .findAny().orElseThrow();
+														     .findAny().get(); 
-								return new UnifyPair(x.getRhsType(), leftElem.getRhsType(), PairOperator.EQUALSDOT);}
+							return new UnifyPair(x.getRhsType(), leftElem.getRhsType(), PairOperator.EQUALSDOT);})
-							)
+											.collect(Collectors.toCollection(ArrayList::new));
-							.collect(Collectors.toCollection(ArrayList::new));
+				if (m.match(matchList).isPresent()) {
-
+					//try { ((FiniteClosure)fc).logFile.write("result1: -1 \n\n"); } catch (IOException ie) {}
-				return (m.match(matchList).isPresent()) ? -1 : 0;
+					return -1;
+				}
+				else {
+					//try { ((FiniteClosure)fc).logFile.write("result1: 0 \n\n"); } catch (IOException ie) {}
+					return 0;
+				}
 			} else if (compareEq == 1) {
-				ArrayList<UnifyPair> matchList =
+				ArrayList<UnifyPair> matchList = 
-						leftleOder.stream().map(x -> {
+						leftleOder.stream().map(x -> { 
 							UnifyPair rightElem = rightleOder.stream()
-								.filter(y -> y.getGroundBasePair().getLhsType().equals(x.getGroundBasePair().getLhsType()))
+									                        .filter(y -> 
-								.findAny().orElseThrow();
+									                        	y.getGroundBasePair().getLhsType().equals(x.getGroundBasePair().getLhsType()))
-							return new UnifyPair(x.getRhsType(), rightElem.getRhsType(), PairOperator.EQUALSDOT);}
+									                        .findAny().get(); 
-						)
+														return new UnifyPair(x.getRhsType(), rightElem.getRhsType(), PairOperator.EQUALSDOT);})
-						.collect(Collectors.toCollection(ArrayList::new));
+											.collect(Collectors.toCollection(ArrayList::new));
-				return (m.match(matchList).isPresent()) ? 1 : 0;
+				if (m.match(matchList).isPresent()) {
+					//try { ((FiniteClosure)fc).logFile.write("result2: 1 \n\n"); } catch (IOException ie) {}
+					return 1;
+				}
+				else {
+					//try { ((FiniteClosure)fc).logFile.write("result2: 0 \n\n"); } catch (IOException ie) {}
+					return 0;
+				}
 			} else {
 				/*
-					((FiniteClosure)fc).logFile.write("leftBase: " + leftBase.toString() +"\n");
+				synchronized(this) {
-					((FiniteClosure)fc).logFile.write("rightBase: " + rightBase.toString() +"\n\n");
+					try {
-					((FiniteClosure)fc).logFile.write("left: " + left.toString() +"\n");
+						((FiniteClosure)fc).logFile.write("leftBase: " + leftBase.toString() +"\n");
-					((FiniteClosure)fc).logFile.write("right: " + right.toString() +"\n\n");
+						((FiniteClosure)fc).logFile.write("rightBase: " + rightBase.toString() +"\n\n");
-					((FiniteClosure)fc).logFile.write("lefteqOder: " + lefteqOder.toString() +"\n");
+						((FiniteClosure)fc).logFile.write("left: " + left.toString() +"\n");
-					((FiniteClosure)fc).logFile.write("righteqOder: " + righteqOder.toString() +"\n\n");
+						((FiniteClosure)fc).logFile.write("right: " + right.toString() +"\n\n");
-					((FiniteClosure)fc).logFile.write("lefteqRet: " + lefteqRet.toString() +"\n");
+						((FiniteClosure)fc).logFile.write("lefteqOder: " + lefteqOder.toString() +"\n");
-					((FiniteClosure)fc).logFile.write("righteqRet: " + righteqRet.toString() +"\n\n");
+						((FiniteClosure)fc).logFile.write("righteqOder: " + righteqOder.toString() +"\n\n");
-					((FiniteClosure)fc).logFile.write("leftleOder: " + leftleOder.toString() +"\n");
+						((FiniteClosure)fc).logFile.write("lefteqRet: " + lefteqRet.toString() +"\n");
-					((FiniteClosure)fc).logFile.write("rightleOder: " + rightleOder.toString() +"\n\n");
+						((FiniteClosure)fc).logFile.write("righteqRet: " + righteqRet.toString() +"\n\n");
-					((FiniteClosure)fc).logFile.write("result3: 0 \n\n");
+						((FiniteClosure)fc).logFile.write("leftleOder: " + leftleOder.toString() +"\n");
-					((FiniteClosure)fc).logFile.flush();
+						((FiniteClosure)fc).logFile.write("rightleOder: " + rightleOder.toString() +"\n\n");
+						((FiniteClosure)fc).logFile.write("result3: 0 \n\n");
+						((FiniteClosure)fc).logFile.flush();
+					}
+					catch (IOException ie) {
+					}
+				}
 				*/
 				return 0;
 			}
 		}
 		
 		
-		if (lefteq.size() == 1 && lefteq.iterator().next().getRhsType() instanceof ExtendsType && leftle.size() == 1  && righteq.isEmpty() && rightle.size() == 1) {
+		if (lefteq.size() == 1 && lefteq.iterator().next().getRhsType() instanceof ExtendsType && leftle.size() == 1  && righteq.size() == 0 && rightle.size() == 1) {
 			return 1;
 		}
 		//Fall 2
-		if (lefteq.isEmpty() && leftle.size() == 1 && righteq.size() == 1 && righteq.iterator().next().getRhsType() instanceof ExtendsType && rightle.size() == 1) {
+		if (lefteq.size() == 0 && leftle.size() == 1 && righteq.size() == 1 && righteq.iterator().next().getRhsType() instanceof ExtendsType && rightle.size() == 1) {
 			return -1;
 		}
 		//Fall 3
-		if (lefteq.size() == 1 && lefteq.iterator().next().getRhsType() instanceof SuperType && leftle.size() == 1  && righteq.isEmpty() && rightle.size() == 1) {
+		if (lefteq.size() == 1 && lefteq.iterator().next().getRhsType() instanceof SuperType && leftle.size() == 1  && righteq.size() == 0 && rightle.size() == 1) {
 			return -1;
 		}
 		//Fall 3
-		if (lefteq.isEmpty() && leftle.size() == 1 && righteq.size() == 1 && righteq.iterator().next().getRhsType() instanceof SuperType && rightle.size() == 1) {
+		if (lefteq.size() == 0 && leftle.size() == 1 && righteq.size() == 1 && righteq.iterator().next().getRhsType() instanceof SuperType && rightle.size() == 1) {
 			return 1;
 		}
 		//Fall 5
-		if (lefteq.size() == 1 && leftle.isEmpty() && righteq.size() == 1 && rightle.size() == 1) {
+		if (lefteq.size() == 1 && leftle.size() == 0 && righteq.size() == 1 && rightle.size() == 1) {
 			return -1;
 		}
 		//Fall 5
-		if (lefteq.size() == 1 && leftle.size() == 1 && righteq.size() == 1 && rightle.isEmpty()) {
+		if (lefteq.size() == 1 && leftle.size() == 1 && righteq.size() == 1 && rightle.size() == 0) {
 			return 1;
 		}
 		//Fall 5
@@ -340,7 +365,7 @@ public class OrderingUnifyPair extends OrderingExtend<Set<UnifyPair>> {
 			return 0;
 		}
 		// Nur Paare a =. Theta
-		if (leftle.isEmpty() && rightle.isEmpty() && leftlewc.isEmpty() && rightlewc.isEmpty()) {
+		if (leftle.size() == 0 && rightle.size() == 0 && leftlewc.size() == 0 && rightlewc.size() ==0) {
 			Stream<UnifyPair> lseq = lefteq.stream(); //left.filter(x -> (x.getLhsType() instanceof PlaceholderType && x.getPairOp() == PairOperator.EQUALSDOT));
 			Stream<UnifyPair> rseq = righteq.stream(); //right.filter(x -> (x.getLhsType() instanceof PlaceholderType && x.getPairOp() == PairOperator.EQUALSDOT));
 			BinaryOperator<HashMap<UnifyType,UnifyPair>> combiner = (x,y) -> { x.putAll(y); return x;};
@@ -348,10 +373,13 @@ public class OrderingUnifyPair extends OrderingExtend<Set<UnifyPair>> {
 			lseq = lseq.filter(x -> !(hm.get(x.getLhsType()) == null));//NOCHMALS UEBERPRUEFEN!!!!
 			lseq = lseq.filter(x -> !x.equals(hm.get(x.getLhsType()))); //Elemente die gleich sind muessen nicht verglichen werden
 			Optional<Integer> si = lseq.map(x -> compareEq(x, hm.get(x.getLhsType()))).reduce((x,y)-> { if (x == y) return x; else return 0; } );
-			return si.orElse(0);
+			if (!si.isPresent()) return 0;
+			else return si.get();
 		}
 		//Fall 1 und 4
-		if (!lefteq.isEmpty() && !righteq.isEmpty() && (!leftlewc.isEmpty() || !rightlewc.isEmpty())) {
+		if (lefteq.size() >= 1 && righteq.size() >= 1 && (leftlewc.size() > 0 || rightlewc.size() > 0)) {
+			if (lefteq.iterator().next().getLhsType().getName().equals("D")) 
+				System.out.print("");
 			//Set<PlaceholderType> varsleft = lefteq.stream().map(x -> (PlaceholderType)x.getLhsType()).collect(Collectors.toCollection(HashSet::new));
 			//Set<PlaceholderType> varsright = righteq.stream().map(x -> (PlaceholderType)x.getLhsType()).collect(Collectors.toCollection(HashSet::new));
 			//filtern des Paares a = Theta, das durch a <. Thata' generiert wurde (nur im Fall 1 relevant)  andere Substitutioen werden rausgefiltert
@@ -372,12 +400,12 @@ public class OrderingUnifyPair extends OrderingExtend<Set<UnifyPair>> {
 				//TODO: Hier wird bei Wildcards nicht das richtige compare aufgerufen PL 18-04-20
 				Pair<Integer, Set<UnifyPair>> int_Unifier = compare(lseq.getRhsType(), rseq.getRhsType());
 				Unifier uni = new Unifier();
-				int_Unifier.getValue().orElseThrow().forEach(x -> uni.add((PlaceholderType) x.getLhsType(), x.getRhsType()));
+				int_Unifier.getValue().get().forEach(x -> uni.add((PlaceholderType) x.getLhsType(), x.getRhsType()));
-				if (!lseq.getRhsType().getName().equals(rseq.getRhsType().getName())
+				if (!lseq.getRhsType().getName().equals(rseq.getRhsType().getName()) 
-					|| leftlewc.isEmpty() || rightlewc.isEmpty()) return int_Unifier.getKey();
+					|| leftlewc.size() == 0 || rightlewc.size() == 0) return int_Unifier.getKey();
 				else {
-					Set <UnifyPair> lsleuni = leftlewc.stream().map(uni::apply).collect(Collectors.toCollection(HashSet::new));
+					Set <UnifyPair> lsleuni = leftlewc.stream().map(x -> uni.apply(x)).collect(Collectors.toCollection(HashSet::new));
-					Set <UnifyPair> rsleuni = rightlewc.stream().map(uni::apply).collect(Collectors.toCollection(HashSet::new));
+					Set <UnifyPair> rsleuni = rightlewc.stream().map(x -> uni.apply(x)).collect(Collectors.toCollection(HashSet::new));
 					BinaryOperator<HashMap<UnifyType,UnifyPair>> combiner = (x,y) -> { x.putAll(y); return x;};
 				
 					HashMap<UnifyType,UnifyPair> hm;
@@ -394,11 +422,11 @@ public class OrderingUnifyPair extends OrderingExtend<Set<UnifyPair>> {
 						Stream<UnifyPair> lslewcstr = lsleuni.stream().filter(x -> !(hm.get(x.getRhsType()) == null));
 						si = lslewcstr.map(x -> fc.compare(x.getLhsType(), hm.get(x.getRhsType()).getLhsType(), PairOperator.SMALLERDOTWC, context)).reduce((x,y)-> { if (x == y) return x; else return 0; } );
 					}
-					return si.orElse(0);
+					if (!si.isPresent()) return 0;
+					else return si.get();
 				}
 			} else {
-				if (!leftlewc.isEmpty()) {
+				if (leftlewc.size() > 0) {
-					/*
 					Set<UnifyPair> subst;
 					subst = leftlewc.stream().map(x -> { 
 						if (x.getLhsType() instanceof PlaceholderType) {
@@ -407,7 +435,6 @@ public class OrderingUnifyPair extends OrderingExtend<Set<UnifyPair>> {
 						else {
 							return new UnifyPair(x.getRhsType(), x.getLhsType(), PairOperator.EQUALSDOT);
 						}}).collect(Collectors.toCollection(HashSet::new));
-					 */
 					Unifier uni = new Unifier();
 					lseq = uni.apply(lseq);
 				}

src/main/java/de/dhbwstuttgart/typeinference/unify/model/PlaceholderType.java

@@ -134,15 +134,15 @@ public final class PlaceholderType extends UnifyType{
 		wildcardable = true;
 	}
 
-	public void setWildcardtable(boolean wildcardable) {
+	public void setWildcardtable(Boolean wildcardable) {
 		this.wildcardable = wildcardable;
 	}
 
-	public boolean isInnerType() {
+	public Boolean isInnerType() {
 		return innerType;
 	}
 
-	public void setInnerType(boolean innerType) {
+	public void setInnerType(Boolean innerType) {
 		this.innerType = innerType;
 	}
 

src/main/java/de/dhbwstuttgart/typeinference/unify/model/ReferenceType.java

@@ -32,7 +32,7 @@ public class ReferenceType extends UnifyType implements ISerializableData {
 		return visitor.visit(this, ht);
 	}
 
-	public ReferenceType(String name, boolean genericTypeVar) {
+	public ReferenceType(String name, Boolean genericTypeVar) {
 		super(name, new TypeParams());
 		hashCode = 31 + 17 * typeName.hashCode() + 17 * typeParams.hashCode();
 		this.genericTypeVar = genericTypeVar;

src/main/java/de/dhbwstuttgart/typeinference/unify/model/UnifyPair.java

@@ -201,7 +201,7 @@ public class UnifyPair implements IConstraintElement, ISerializableData {
 			
 	}
 	
-	public boolean wrongWildcard() {
+	public Boolean wrongWildcard() {
 		return lhs.wrongWildcard() || rhs.wrongWildcard();
 	}
 	

src/main/java/de/dhbwstuttgart/typeinference/unify/model/UnifyType.java

@@ -103,7 +103,7 @@ public abstract class UnifyType implements ISerializableData {
     return new ArrayList<>(typeParams.getInvolvedPlaceholderTypes());
 	}
 	
-	public boolean wrongWildcard() {//default
+	public Boolean wrongWildcard() {//default
 		return false;
 	}
 

src/main/java/de/dhbwstuttgart/typeinference/unify/model/WildcardType.java

@@ -42,7 +42,7 @@ public abstract class WildcardType extends UnifyType implements ISerializableDat
 	}
 	
 	@Override
-	public boolean wrongWildcard () {//This is an error
+	public Boolean wrongWildcard () {//This is an error
 		return (wildcardedType instanceof WildcardType);
 	}
 	

src/main/java/de/dhbwstuttgart/util/Logger.java

@@ -1,322 +1,9 @@
 package de.dhbwstuttgart.util;
 
-import com.diogonunes.jcolor.Attribute;
-import de.dhbwstuttgart.core.ConsoleInterface;
-import de.dhbwstuttgart.server.SocketServer;
-import java.io.File;
-import java.io.FileWriter;
-import java.io.IOException;
-import java.io.Writer;
-import java.nio.file.Path;
-import java.time.LocalDateTime;
-import java.time.format.DateTimeFormatter;
-import java.util.Arrays;
-import java.util.Objects;
-import java.util.function.Supplier;
-import java.util.stream.Collectors;
-
-import static com.diogonunes.jcolor.Ansi.colorize;
-
 public class Logger {
 
-  public static final Logger NULL_LOGGER = new NullLogger();
+  public static void print(String s) {
-  private static final DateTimeFormatter timeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
+    System.out.println(s);
-
-  protected final Writer writer;
-  protected final String prefix;
-
-  public Logger() {
-    this(null, "");
   }
 
-  public Logger(String prefix) {
+}
-    this(null, prefix);
-  }
-
-  public Logger(Writer writer, String prefix) {
-    this.prefix = (Objects.equals(prefix, "")) ? "" : "["+prefix+"] ";
-    this.writer = writer;
-  }
-
-  /**
-   * Create a new logger object from the path provided
-   *
-   * @param filePath  The path to the output file. Recommended file extension ".log"
-   * @return          The Logger object for this output file
-   */
-  public static Logger forFile(String filePath, String prefix) {
-    File file = Path.of(filePath).toFile();
-    try {
-      Writer fileWriter = new FileWriter(file);
-      return new Logger(fileWriter, prefix);
-    }
-    catch (IOException exception) {
-      throw new RuntimeException("Failed to created Logger for file " + filePath, exception);
-    }
-  }
-
-  /**
-   * Create a new logger object that inherits the writer of the given logger object
-   *
-   * @param logger    The old logger object that will provide the writer
-   * @return          The new prefix for the new logger object
-   */
-  public static Logger inherit(Logger logger, String newPrefix) {
-    return new Logger(logger.writer, newPrefix);
-  }
-
-  /**
-   * Tint the prefix in the color of the logLevel
-   * @param logLevel  The logLevel to set the tint to
-   * @return          The tinted string (using ANSI sequences)
-   */
-  protected String getPrefix(LogLevel logLevel) {
-    String fullPrefix = prefix + "[" + logLevel + "] ";
-    return switch (logLevel) {
-      case DEBUG    -> colorize(fullPrefix, Attribute.BRIGHT_MAGENTA_TEXT());
-      case INFO     -> colorize(fullPrefix, Attribute.BLUE_TEXT());
-      case WARNING  -> colorize(fullPrefix, Attribute.YELLOW_TEXT());
-      case ERROR    -> colorize(fullPrefix, Attribute.RED_TEXT());
-      case SUCCESS  -> colorize(fullPrefix, Attribute.GREEN_TEXT());
-    };
-  }
-
-  /**
-   * Print text to the output or error stream, depending on the logLevel
-   * @param s         The string to print
-   * @param logLevel  If logLevel == error, then print to stderr or print to stdout otherwise
-   */
-  protected void print(String s, LogLevel logLevel) {
-    String coloredPrefix = this.getPrefix(logLevel);
-
-    // if we are running the server, prepend the timestamp
-    if(SocketServer.isServerRunning()) {
-      String timestamp = LocalDateTime.now().format(timeFormatter);
-      coloredPrefix = "[" + timestamp + "] " + coloredPrefix;
-    }
-
-    // output to the correct output-stream
-    if (logLevel.getValue() == LogLevel.ERROR.getValue()) {
-      System.out.println(coloredPrefix + s);
-    }
-    else {
-      System.err.println(coloredPrefix + s);
-    }
-  }
-
-  public boolean isLogLevelActive(LogLevel logLevel) {
-    return logLevel.isHigherOrEqualTo(ConsoleInterface.logLevel);
-  }
-
-  /**
-   * Write text to the attached writer if there is any
-   * @param s   The string to print
-   */
-  protected void write(String s) {
-    if (writer != null && ConsoleInterface.writeLogFiles) {
-      // writing to file should only be done when necessary
-      synchronized (writer) {
-        try {
-          writer.write(s);
-        }
-        catch (IOException exception) {
-          throw new RuntimeException("Failed writing to file", exception);
-        }
-      }
-    }
-  }
-
-  /**
-   * Base method for logging a string value. Should mostly be used by the Logger internal functions that
-   * abstract the logLevel away from the parameters
-   *
-   * @hidden Only relevant for the Logger and very special cases with dynamic logLevel
-   * @param s         The text to log
-   * @param logLevel  The logLevel on which the text should be logged
-   */
-  public void log(String s, LogLevel logLevel) {
-    if (isLogLevelActive(logLevel)) {
-      this.print(s, logLevel);
-      this.write(s);
-    }
-  }
-  public void log(Supplier<String> supp, LogLevel logLevel) {
-    if (isLogLevelActive(logLevel)) {
-      this.log(supp.get(), logLevel);
-    }
-  }
-  public void log(Object obj, LogLevel logLevel) {
-    if (isLogLevelActive(logLevel)) {
-      this.log(obj.toString(), logLevel);
-    }
-  }
-
-
-  /**
-   * Output a debug message
-   * @param s The string to log
-   */
-  public void debug(String s) {
-    this.log(s, LogLevel.DEBUG);
-  }
-  public void debug(Object o) {
-    this.log(o, LogLevel.DEBUG);
-  }
-  public void debug(Supplier<String> supp) {
-    this.log(supp, LogLevel.DEBUG);
-  }
-
-  /**
-   * Output an info message
-   * @param s The string to log
-   */
-  public void info(String s) {
-    this.log(s, LogLevel.INFO);
-  }
-  public void info(Object o) {
-    this.log(o, LogLevel.INFO);
-  }
-  public void info(Supplier<String> supp) {
-    this.log(supp, LogLevel.INFO);
-  }
-
-  /**
-   * Output a warning message
-   * @param s The string to log
-   */
-  public void warn(String s) {
-    this.log(s, LogLevel.WARNING);
-  }
-  public void warn(Object o) {
-    this.log(o, LogLevel.WARNING);
-  }
-  public void warn(Supplier<String> supp) {
-    this.log(supp, LogLevel.WARNING);
-  }
-
-  /**
-   * Output an error message
-   * @param s The string to log
-   */
-  public void error(String s) {
-    this.log(s, LogLevel.ERROR);
-  }
-  public void error(Object o) {
-    this.log(o, LogLevel.ERROR);
-  }
-  public void error(Supplier<String> supp) {
-    this.log(supp, LogLevel.ERROR);
-  }
-
-
-  /**
-   * Output a success message
-   * @param s The string to log
-   */
-  public void success(String s) {
-    this.log(s, LogLevel.SUCCESS);
-  }
-  public void success(Object o) {
-    this.log(o, LogLevel.SUCCESS);
-  }
-  public void success(Supplier<String> supp) {
-    this.log(supp, LogLevel.SUCCESS);
-  }
-
-  /**
-   * Special logging function that prints a throwable object and all of its recursive causes (including stacktrace)
-   * as an error
-   *
-   * @param throwable The Throwable object to output
-   */
-  public void exception(Throwable throwable) {
-    // Format the exception output
-    String s = "Exception: " + throwable.getMessage() + "\n" +
-      Arrays.stream(throwable.getStackTrace()).map(stackTraceElement ->
-        " | " + stackTraceElement.toString()
-      ).collect(Collectors.joining("\n"));
-
-    // if there is a cause printed afterward, announce it with the print of the exception
-    if (throwable.getCause() != null) {
-      s += "\n\nCaused by: ";
-    }
-
-    // print the exception
-    this.error(s);
-
-    // print the cause recursively
-    if (throwable.getCause() != null) {
-      this.exception(throwable.getCause());
-    }
-  }
-
-  public void close() {
-    if (this.writer != null) {
-      try {
-        this.writer.close();
-      }
-      catch (IOException exception) {
-        throw new RuntimeException("Failed to close a loggers writer. Was it maybe already closed? ", exception);
-      }
-    }
-  }
-
-
-  /**
-   * An enum representing the different log levels as integers:
-   * <ul>
-   *  <li>DEBUG: highly specific output only for debugging</li>
-   *  <li>INFO: informational output about the current state of the program</li>
-   *  <li>WARNING: warnings about potential issues or an unexpected state</li>
-   *  <li>ERROR: invalid states, errors and exceptions</li>
-   *  <li>SUCCESS: successfully executed key steps of the program</li>
-   * </ul>
-   */
-  public enum LogLevel {
-    /** Highly specific output only for debugging */
-    DEBUG(0),
-    /** Informational output about the current state of the program */
-    INFO(1),
-    /** Warnings about potential issues or an unexpected state **/
-    WARNING(2),
-    /** Invalid states, errors and exceptions */
-    ERROR(3),
-    /** Successfully executed key steps of the program */
-    SUCCESS(4);
-
-    private final int value;
-    LogLevel(final int newValue) {
-      value = newValue;
-    }
-
-    public boolean isHigherOrEqualTo(LogLevel other) {
-      return this.value >= other.value;
-    }
-
-    public int getValue() {
-      return value;
-    }
-
-    public static LogLevel fromValue(int value) {
-      return switch (value) {
-        case 0 -> LogLevel.DEBUG;
-        case 1 -> LogLevel.INFO;
-        case 2 -> LogLevel.WARNING;
-        case 3 -> LogLevel.ERROR;
-        case 4 -> LogLevel.SUCCESS;
-        default -> throw new RuntimeException("Invalid log level value: " + value);
-      };
-    }
-  }
-
-
-  /**
-   * A special case of logger that will never output anything
-   */
-  private static class NullLogger extends Logger {
-    @Override
-    public void log(String s, LogLevel logLevel) {
-      // Do nothing. Yay
-    }
-  }
-}

src/test/java/AllgemeinTest.java

@@ -1,6 +1,6 @@
 
 
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.Assert.*;
 import static targetast.TestCodegen.generateClassFiles;
 
 import java.io.File;
@@ -9,12 +9,13 @@ import java.net.URL;
 import java.net.URLClassLoader;
 import java.util.Arrays;
 
-import org.junit.jupiter.api.BeforeAll;
+import org.junit.BeforeClass;
-import org.junit.jupiter.api.Test;
+import org.junit.Test;
 
 import com.google.common.collect.Lists;
 
 import de.dhbwstuttgart.core.JavaTXCompiler;
+import de.dhbwstuttgart.environment.ByteArrayClassLoader;
 
 public class AllgemeinTest {
 

src/test/java/GenericsParserTest.java

@@ -6,12 +6,12 @@ import de.dhbwstuttgart.syntaxtree.GenericTypeVar;
 import de.dhbwstuttgart.syntaxtree.factory.ASTFactory;
 import de.dhbwstuttgart.syntaxtree.type.*;
 import de.dhbwstuttgart.target.generate.ASTToTargetAST;
-import org.junit.jupiter.api.Test;
+import org.junit.Test;
 
 import java.util.ArrayList;
 import java.util.List;
 
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.Assert.*;
 
 public class GenericsParserTest {
 

src/test/java/TestPackages.java

@@ -1,6 +1,6 @@
 import de.dhbwstuttgart.core.JavaTXCompiler;
-import org.junit.jupiter.api.Disabled;
+import org.junit.Ignore;
-import org.junit.jupiter.api.Test;
+import org.junit.Test;
 
 import java.io.File;
 import java.util.List;
@@ -24,7 +24,7 @@ public class TestPackages {
     }
 
     @Test
-    @Disabled("This doesn't work")
+    @Ignore("This doesn't work")
     public void testPackagesCircular() throws Exception {
         var cmp = new JavaTXCompiler(
             List.of(

src/test/java/TestTypeDeployment.java

@@ -4,7 +4,7 @@ import de.dhbwstuttgart.syntaxtree.SourceFile;
 import de.dhbwstuttgart.typedeployment.TypeInsert;
 import de.dhbwstuttgart.typedeployment.TypeInsertFactory;
 import de.dhbwstuttgart.typeinference.result.ResultSet;
-import org.junit.jupiter.api.Test;
+import org.junit.Test;
 
 import java.io.File;
 import java.nio.file.Path;
@@ -18,7 +18,7 @@ public class TestTypeDeployment {
     public void testTypeDeployment() throws Exception {
         var path = Path.of(System.getProperty("user.dir"), "/resources/bytecode/javFiles/Cycle.jav");
         var file = path.toFile();
-        var compiler = new JavaTXCompiler(file);
+        var compiler = new JavaTXCompiler(file, false);
         var parsedSource = compiler.sourceFiles.get(file);
         var tiResults = compiler.typeInference(file);
         Set<TypeInsert> tips = new HashSet<>();

src/test/java/astfactory/ASTFactoryTest.java

@@ -4,7 +4,7 @@ package astfactory;
 import de.dhbwstuttgart.syntaxtree.ClassOrInterface;
 import de.dhbwstuttgart.syntaxtree.factory.ASTFactory;
 import de.dhbwstuttgart.syntaxtree.type.GenericRefType;
-import org.junit.jupiter.api.Test;
+import org.junit.Test;
 
 import java.lang.reflect.ParameterizedType;
 import java.lang.reflect.Type;
@@ -12,8 +12,7 @@ import java.lang.reflect.TypeVariable;
 import java.util.Arrays;
 import java.util.HashMap;
 
-import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.Assert.*;
-
 
 public class ASTFactoryTest<A> extends HashMap<String, A>{
     @Test

src/test/java/finiteClosure/SuperInterfacesTest.java

@@ -4,10 +4,12 @@ import de.dhbwstuttgart.core.JavaTXCompiler;
 import de.dhbwstuttgart.parser.SyntaxTreeGenerator.FCGenerator;
 import de.dhbwstuttgart.syntaxtree.ClassOrInterface;
 import de.dhbwstuttgart.syntaxtree.factory.ASTFactory;
-import org.junit.jupiter.api.Test;
+import de.dhbwstuttgart.typeinference.unify.PlaceholderRegistry;
+import org.junit.Test;
 
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.List;
 
 public class SuperInterfacesTest {
     @Test

src/test/java/server/PacketExampleData.java

@@ -18,7 +18,6 @@ import de.dhbwstuttgart.typeinference.unify.model.SuperType;
 import de.dhbwstuttgart.typeinference.unify.model.TypeParams;
 import de.dhbwstuttgart.typeinference.unify.model.UnifyPair;
 import de.dhbwstuttgart.typeinference.unify.model.UnifyType;
-import de.dhbwstuttgart.util.Logger;
 import java.io.Writer;
 import java.util.HashSet;
 import java.util.List;
@@ -85,12 +84,13 @@ class PacketExampleData {
 
   static UnifyContext createTestContext() {
     var placeholderRegistry = new PlaceholderRegistry();
-    return new UnifyContext(Logger.NULL_LOGGER, true,
+    var nullWriter = Writer.nullWriter();
+    return new UnifyContext(nullWriter, false, true,
       new UnifyResultModel(
         new ConstraintSet<>(),
         new FiniteClosure(
           new HashSet<>(),
-          Logger.NULL_LOGGER,
+          nullWriter,
           placeholderRegistry)),
       new UnifyTaskModel(),
       ForkJoinPool.commonPool(),

src/test/java/server/PacketTest.java

@@ -1,7 +1,7 @@
 package server;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
-import de.dhbwstuttgart.core.JavaTXCompiler;
+import de.dhbwstuttgart.environment.ByteArrayClassLoader;
 import de.dhbwstuttgart.parser.SourceLoc;
 import de.dhbwstuttgart.server.packet.DebugPacket;
 import de.dhbwstuttgart.server.packet.IPacket;
@@ -16,11 +16,18 @@ import de.dhbwstuttgart.server.packet.dataContainers.serialized.SerialUUID;
 import de.dhbwstuttgart.server.packet.dataContainers.serialized.SerialValue;
 import de.dhbwstuttgart.typeinference.constraints.Constraint;
 import de.dhbwstuttgart.typeinference.constraints.ConstraintSet;
+import de.dhbwstuttgart.typeinference.unify.PlaceholderRegistry;
 import de.dhbwstuttgart.typeinference.unify.UnifyContext;
+import de.dhbwstuttgart.typeinference.unify.UnifyResultModel;
+import de.dhbwstuttgart.typeinference.unify.UnifyTaskModel;
+import de.dhbwstuttgart.typeinference.unify.model.FiniteClosure;
 import de.dhbwstuttgart.typeinference.unify.model.UnifyPair;
+import java.io.Writer;
+import java.util.HashSet;
+import java.util.concurrent.ForkJoinPool;
 import java.util.function.BiFunction;
-import org.junit.jupiter.api.Test;
+import org.junit.Test;
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.Assert.*;
 
 public class PacketTest {
 

src/test/java/server/ServerTest.java

@@ -1,12 +1,9 @@
 package server;
 
-import de.dhbwstuttgart.core.ConsoleInterface;
 import de.dhbwstuttgart.core.JavaTXCompiler;
 import de.dhbwstuttgart.core.JavaTXServer;
 import de.dhbwstuttgart.environment.CompilationEnvironment;
 import de.dhbwstuttgart.server.SocketClient;
-import de.dhbwstuttgart.server.packet.SetAutoclosePacket;
-import de.dhbwstuttgart.server.packet.UnifyRequestPacket;
 import de.dhbwstuttgart.syntaxtree.ClassOrInterface;
 import de.dhbwstuttgart.syntaxtree.factory.ASTFactory;
 import de.dhbwstuttgart.syntaxtree.factory.UnifyTypeFactory;
@@ -23,33 +20,30 @@ import de.dhbwstuttgart.typeinference.unify.model.FiniteClosure;
 import de.dhbwstuttgart.typeinference.unify.model.PlaceholderType;
 import de.dhbwstuttgart.typeinference.unify.model.UnifyPair;
 import de.dhbwstuttgart.typeinference.unify.model.UnifyType;
-import de.dhbwstuttgart.util.Logger;
 import java.io.File;
 import java.io.IOException;
 import java.io.Writer;
 import java.nio.file.Path;
 import java.util.HashSet;
 import java.util.List;
-import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.stream.Collectors;
+import org.junit.Ignore;
+import org.junit.Test;
 import targetast.TestCodegen;
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.Assert.*;
 
+@Ignore("Server tests create huge overhead, so they are ignored until required")
 public class ServerTest {
 
-  public ServerTest() {
+  @Test
-    ConsoleInterface.unifyServerUrl = Optional.of("ws://localhost:5000");
-  }
-
-  //@Test
   public void checkServer_Scalar() throws IOException, ClassNotFoundException {
     compareLocalAndServerResult("Scalar.jav");
   }
 
-  //@Test
+  @Test
   public void checkServer_Matrix() throws IOException, ClassNotFoundException {
     compareLocalAndServerResult("Matrix.jav");
   }
@@ -57,11 +51,11 @@ public class ServerTest {
   protected void compareLocalAndServerResult(final String filename) throws IOException, ClassNotFoundException {
     File file = Path.of(TestCodegen.path.toString(), filename).toFile();
 
-    // get information from the compiler
+    // get information from compiler
     JavaTXCompiler compiler = new JavaTXCompiler(List.of(file));
 
     // NOW: simulate the call to method typeInference. Once via server and once locally
-    // if everything works, they should neither interfere with each other nor differ in their result
+    // if everything works, they should neither interfere with each other, nor differ in their result
 
     // get the values from the compiler
     PlaceholderRegistry placeholderRegistry = JavaTXCompiler.defaultClientPlaceholderRegistry; //new PlaceholderRegistry();
@@ -71,7 +65,7 @@ public class ServerTest {
 
     FiniteClosure finiteClosure = UnifyTypeFactory.generateFC(
       ServerTest.getAllClasses(compiler, file).stream().toList(),
-      Logger.NULL_LOGGER,
+      Writer.nullWriter(),
       compiler.classLoader,
       compiler,
       placeholderRegistry
@@ -90,11 +84,9 @@ public class ServerTest {
     // run the unification on the server
     PlaceholderRegistry prCopy = JavaTXCompiler.defaultClientPlaceholderRegistry.deepClone();
     UnifyResultModel urm = new UnifyResultModel(cons, finiteClosure);
-    UnifyContext context = new UnifyContext(Logger.NULL_LOGGER, true, urm, usedTasks, prCopy);
+    UnifyContext context = new UnifyContext(Writer.nullWriter(), false, true, urm, usedTasks, prCopy);
-    SocketClient.execute(SetAutoclosePacket.create());
+    SocketClient socketClient = new SocketClient("ws://localhost:5000");
-    List<ResultSet> serverResult = SocketClient.executeAndGet(
+    List<ResultSet> serverResult = socketClient.execute(finiteClosure, cons, unifyCons, context);
-      UnifyRequestPacket.create(finiteClosure, cons, unifyCons, context.placeholderRegistry())
-    ).getResultSet(context);
 
     // close the server
     server.forceStop();

src/test/java/syntaxtreegenerator/TestComplete.java

@@ -1,5 +1,9 @@
 package syntaxtreegenerator;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
 import java.io.File;
 import java.io.FileFilter;
 import java.io.FileInputStream;
@@ -8,23 +12,21 @@ import java.io.ObjectOutputStream;
 import java.util.ArrayList;
 import java.util.HashMap;
 
-import org.junit.jupiter.api.BeforeAll;
+import org.junit.BeforeClass;
-import org.junit.jupiter.api.Test;
+import org.junit.Test;
 
 import de.dhbwstuttgart.core.JavaTXCompiler;
 import de.dhbwstuttgart.exceptions.NotImplementedException;
 import de.dhbwstuttgart.syntaxtree.SourceFile;
 import de.dhbwstuttgart.syntaxtree.visual.ASTPrinter;
 
-import static org.junit.jupiter.api.Assertions.*;
-
 /**
  * Unit-Tests für den 'SyntaxTreeGenerator' aus dem Package 'parser' nach Vorbild der Klasse 'TestComplete' aus dem Test-Package 'targetast'
  */
 public class TestComplete {
     private static HashMap<String, File[]> javFiles = new HashMap<>();
 
-    @BeforeAll
+    @BeforeClass
     public static void setUp() {
         final String testFileDirectory = "resources/bytecode/javFiles/";
         final String expectedASTDirectory = "resources/syntaxtreegenerator/";
@@ -351,7 +353,7 @@ public class TestComplete {
             assertEquals("Comparing expected and resulting AST for mathStrucInteger.jav", expectedAST, resultingAST);
         } catch (Exception exc) {
             exc.printStackTrace();
-            assertInstanceOf(NotImplementedException.class, exc);
+            assertTrue("An error occured while generating the AST for mathStrucInteger.jav", exc instanceof NotImplementedException);
         }
     }
 

src/test/java/syntaxtreegenerator/TestNewFeatures.java

@@ -1,15 +1,15 @@
 package syntaxtreegenerator;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.Assert.assertEquals;
-import static org.junit.jupiter.api.Assertions.fail;
+import static org.junit.Assert.fail;
 
 import java.io.File;
 import java.io.FileFilter;
 import java.io.FileInputStream;
 import java.util.HashMap;
 
-import org.junit.jupiter.api.BeforeAll;
+import org.junit.BeforeClass;
-import org.junit.jupiter.api.Test;
+import org.junit.Test;
 
 import de.dhbwstuttgart.core.JavaTXCompiler;
 import de.dhbwstuttgart.syntaxtree.visual.ASTPrinter;
@@ -17,7 +17,7 @@ import de.dhbwstuttgart.syntaxtree.visual.ASTPrinter;
 public class TestNewFeatures {
     private static HashMap<String, File[]> javFiles = new HashMap<>();
 
-    @BeforeAll
+    @BeforeClass
     public static void setUp() {
         final String testFileDirectory = "resources/syntaxtreegenerator/javFiles/";
         final String expectedASTDirectory = "resources/syntaxtreegenerator/";

src/test/java/targetast/ASTToTypedTargetAST.java

@@ -2,6 +2,7 @@ package targetast;
 
 import com.google.common.reflect.TypeToken;
 import de.dhbwstuttgart.core.JavaTXCompiler;
+import de.dhbwstuttgart.environment.ByteArrayClassLoader;
 import de.dhbwstuttgart.parser.NullToken;
 import de.dhbwstuttgart.parser.scope.JavaClassName;
 import de.dhbwstuttgart.syntaxtree.*;
@@ -9,13 +10,13 @@ import de.dhbwstuttgart.syntaxtree.type.RefType;
 import de.dhbwstuttgart.target.generate.ASTToTargetAST;
 import de.dhbwstuttgart.target.tree.TargetStructure;
 import de.dhbwstuttgart.typeinference.result.ResultSet;
-import org.junit.jupiter.api.Disabled;
+import org.junit.Ignore;
-import org.junit.jupiter.api.Test;
+import org.junit.Test;
 
 import java.nio.file.Path;
 import java.util.*;
 
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.Assert.*;
 
 public class ASTToTypedTargetAST {
 
@@ -23,7 +24,7 @@ public class ASTToTypedTargetAST {
     public void emptyClass() {
         ClassOrInterface emptyClass = new ClassOrInterface(0, new JavaClassName("EmptyClass"), new ArrayList<>(), Optional.empty(), Optional.empty(), new ArrayList<>(), new ArrayList<>(), new GenericDeclarationList(new ArrayList<>(), new NullToken()), new RefType(new JavaClassName("Object"), new NullToken()), false, false, new ArrayList<>(), new ArrayList<>(), new NullToken(), null);
         ResultSet emptyResultSet = new ResultSet(new HashSet<>());
-        TargetStructure emptyTargetClass = new ASTToTargetAST(List.of(emptyResultSet), TestCodegen.createClassLoader()).convert(emptyClass);
+        TargetStructure emptyTargetClass = new ASTToTargetAST(List.of(emptyResultSet)).convert(emptyClass);
         assert emptyTargetClass.getName().equals("EmptyClass");
         assert emptyTargetClass.methods().size() == 0;
         assert emptyTargetClass.fields().size() == 0;
@@ -31,14 +32,13 @@ public class ASTToTypedTargetAST {
 
     @Test
     public void overloading() throws Exception {
-        var classLoader = TestCodegen.createClassLoader();
-
         var file = Path.of(System.getProperty("user.dir"), "/resources/bytecode/javFiles/Overloading.jav").toFile();
         var compiler = new JavaTXCompiler(file);
         var resultSet = compiler.typeInference(file);
-        var converter = new ASTToTargetAST(compiler, resultSet, classLoader);
+        var converter = new ASTToTargetAST(compiler, resultSet);
         var classes = compiler.sourceFiles.get(file).getClasses();
 
+        var classLoader = new ByteArrayClassLoader();
         var overloading = TestCodegen.generateClass(converter.convert(classes.get(0)), classLoader);
         var overloading2 = TestCodegen.generateClass(converter.convert(classes.get(1)), classLoader);
 
@@ -54,54 +54,46 @@ public class ASTToTypedTargetAST {
 
     @Test
     public void tphsAndGenerics() throws Exception {
-        var classLoader = TestCodegen.createClassLoader();
-
         var file = Path.of(System.getProperty("user.dir"), "/resources/bytecode/javFiles/Tph2.jav").toFile();
         var compiler = new JavaTXCompiler(file);
         var resultSet = compiler.typeInference(file);
-        var converter = new ASTToTargetAST(compiler, resultSet, classLoader);
+        var converter = new ASTToTargetAST(compiler, resultSet);
         var classes = compiler.sourceFiles.get(file).getClasses();
 
-        var tphAndGenerics = TestCodegen.generateClass(converter.convert(classes.get(0)), classLoader);
+        var tphAndGenerics = TestCodegen.generateClass(converter.convert(classes.get(0)), new ByteArrayClassLoader());
     }
 
     @Test
     public void cycles() throws Exception {
-        var classLoader = TestCodegen.createClassLoader();
-
         var file = Path.of(System.getProperty("user.dir"), "/resources/bytecode/javFiles/Cycle.jav").toFile();
         var compiler = new JavaTXCompiler(file);
         var resultSet = compiler.typeInference(file);
-        var converter = new ASTToTargetAST(compiler, resultSet, classLoader);
+        var converter = new ASTToTargetAST(compiler, resultSet);
         var classes = compiler.sourceFiles.get(file).getClasses();
 
-        var cycle = TestCodegen.generateClass(converter.convert(classes.get(0)), classLoader);
+        var cycle = TestCodegen.generateClass(converter.convert(classes.get(0)), new ByteArrayClassLoader());
     }
 
     @Test
     public void infimum() throws Exception {
-        var classLoader = TestCodegen.createClassLoader();
-
         var file = Path.of(System.getProperty("user.dir"), "/resources/bytecode/javFiles/Infimum.jav").toFile();
         var compiler = new JavaTXCompiler(file);
         var resultSet = compiler.typeInference(file);
-        var converter = new ASTToTargetAST(compiler, resultSet, classLoader);
+        var converter = new ASTToTargetAST(compiler, resultSet);
         var classes = compiler.sourceFiles.get(file).getClasses();
 
-        var infimum = TestCodegen.generateClass(converter.convert(classes.get(0)), classLoader);
+        var infimum = TestCodegen.generateClass(converter.convert(classes.get(0)), new ByteArrayClassLoader());
     }
 
     @Test
     public void gen() throws Exception {
-        var classLoader = TestCodegen.createClassLoader();
-
         var file = Path.of(System.getProperty("user.dir"), "/resources/bytecode/javFiles/Gen.jav").toFile();
         var compiler = new JavaTXCompiler(file);
         var resultSet = compiler.typeInference(file);
-        var converter = new ASTToTargetAST(compiler, resultSet, classLoader);
+        var converter = new ASTToTargetAST(compiler, resultSet);
         var classes = compiler.sourceFiles.get(file).getClasses();
 
-        var generics = TestCodegen.generateClass(converter.convert(classes.get(0)), TestCodegen.createClassLoader());
+        var generics = TestCodegen.generateClass(converter.convert(classes.get(0)), new ByteArrayClassLoader());
         var m = generics.getDeclaredMethod("m", Vector.class);
         var mReturnType = m.getGenericReturnType();
         assertEquals(mReturnType, m.getParameters()[0].getParameterizedType());
@@ -111,15 +103,13 @@ public class ASTToTypedTargetAST {
 
     @Test
     public void definedGenerics() throws Exception {
-        var classLoader = TestCodegen.createClassLoader();
-
         var file = Path.of(System.getProperty("user.dir"), "/resources/bytecode/javFiles/Generics.jav").toFile();
         var compiler = new JavaTXCompiler(file);
         var resultSet = compiler.typeInference(file);
-        var converter = new ASTToTargetAST(compiler, resultSet, classLoader);
+        var converter = new ASTToTargetAST(compiler, resultSet);
         var classes = compiler.sourceFiles.get(file).getClasses();
 
-        var generics = TestCodegen.generateClass(converter.convert(classes.get(0)), classLoader);
+        var generics = TestCodegen.generateClass(converter.convert(classes.get(0)), new ByteArrayClassLoader());
         var B = generics.getTypeParameters()[0];
         var mt1 = generics.getDeclaredMethod("mt1", Object.class);
         var constructor = generics.getDeclaredConstructor(Object.class);
@@ -131,15 +121,13 @@ public class ASTToTypedTargetAST {
 
     @Test
     public void definedGenerics2() throws Exception {
-        var classLoader = TestCodegen.createClassLoader();
-
         var file = Path.of(System.getProperty("user.dir"), "/resources/bytecode/javFiles/Generics2.jav").toFile();
         var compiler = new JavaTXCompiler(file);
         var resultSet = compiler.typeInference(file);
-        var converter = new ASTToTargetAST(compiler, resultSet, classLoader);
+        var converter = new ASTToTargetAST(compiler, resultSet);
         var classes = compiler.sourceFiles.get(file).getClasses();
 
-        var generics2 = TestCodegen.generateClass(converter.convert(classes.get(0)), classLoader);
+        var generics2 = TestCodegen.generateClass(converter.convert(classes.get(0)), new ByteArrayClassLoader());
         assertEquals(generics2.getTypeParameters()[0].getBounds()[0], String.class);
         var m = generics2.getDeclaredMethod("m1", Object.class);
         assertEquals(m.getTypeParameters()[0].getBounds()[0], Integer.class);
@@ -147,30 +135,26 @@ public class ASTToTypedTargetAST {
     }
 
     @Test
-    @Disabled("Not implemented")
+    @Ignore("Not implemented")
     public void definedGenerics3() throws Exception {
-        var classLoader = TestCodegen.createClassLoader();
-
         var file = Path.of(System.getProperty("user.dir"), "/resources/bytecode/javFiles/Generics3.jav").toFile();
         var compiler = new JavaTXCompiler(file);
         var resultSet = compiler.typeInference(file);
-        var converter = new ASTToTargetAST(compiler, resultSet, classLoader);
+        var converter = new ASTToTargetAST(compiler, resultSet);
         var classes = compiler.sourceFiles.get(file).getClasses();
 
-        var generics3 = TestCodegen.generateClass(converter.convert(classes.get(0)), classLoader);
+        var generics3 = TestCodegen.generateClass(converter.convert(classes.get(0)), new ByteArrayClassLoader());
     }
 
     @Test
     public void definedGenerics4() throws Exception {
-        var classLoader = TestCodegen.createClassLoader();
-
         var file = Path.of(System.getProperty("user.dir"), "/resources/bytecode/javFiles/Generics4.jav").toFile();
         var compiler = new JavaTXCompiler(file);
         var resultSet = compiler.typeInference(file);
-        var converter = new ASTToTargetAST(compiler, resultSet, classLoader);
+        var converter = new ASTToTargetAST(compiler, resultSet);
         var classes = compiler.sourceFiles.get(file).getClasses();
 
-        var generics4 = TestCodegen.generateClass(converter.convert(classes.get(0)), classLoader);
+        var generics4 = TestCodegen.generateClass(converter.convert(classes.get(0)), new ByteArrayClassLoader());
 
         // var instance = generics4.getDeclaredConstructor().newInstance();
         // var method = generics4.getDeclaredMethod("m2", Object.class);

src/test/java/targetast/GreaterEqualTest.java

@@ -1,21 +1,22 @@
 package targetast;
 
-import org.junit.jupiter.api.BeforeAll;
+import de.dhbwstuttgart.environment.ByteArrayClassLoader;
-import org.junit.jupiter.api.Test;
+import org.junit.BeforeClass;
+import org.junit.Test;
 
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 
-import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.Assert.assertFalse;
-import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.Assert.assertTrue;
 
 public class GreaterEqualTest {
     static Class<?> classToTest;
     static Object instance;
 
-    @BeforeAll
+    @BeforeClass
     public static void beforeClass() throws Exception {
-        var classFiles = TestCodegen.generateClassFiles(TestCodegen.createClassLoader(), "GreaterEqual.jav");
+        var classFiles = TestCodegen.generateClassFiles(new ByteArrayClassLoader(), "GreaterEqual.jav");
         classToTest = classFiles.get("GreaterEqual");
         instance = classToTest.getDeclaredConstructor().newInstance();
     }

src/test/java/targetast/GreaterThanTest.java

@@ -1,20 +1,21 @@
 package targetast;
 
-import org.junit.jupiter.api.BeforeAll;
+import de.dhbwstuttgart.environment.ByteArrayClassLoader;
-import org.junit.jupiter.api.Test;
+import org.junit.BeforeClass;
+import org.junit.Test;
 
 import java.lang.reflect.Method;
 
-import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.Assert.assertFalse;
-import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.Assert.assertTrue;
 
 public class GreaterThanTest {
     static Class<?> classToTest;
     static Object instance;
 
-    @BeforeAll
+    @BeforeClass
     public static void beforeClass() throws Exception {
-        var classFiles = TestCodegen.generateClassFiles(TestCodegen.createClassLoader(), "GreaterThan.jav");
+        var classFiles = TestCodegen.generateClassFiles(new ByteArrayClassLoader(), "GreaterThan.jav");
         classToTest = classFiles.get("GreaterThan");
         instance = classToTest.getDeclaredConstructor().newInstance();
     }

src/test/java/targetast/InheritTest.java

@@ -1,20 +1,22 @@
 package targetast;
 
-import org.junit.jupiter.api.BeforeAll;
+import de.dhbwstuttgart.environment.ByteArrayClassLoader;
-import org.junit.jupiter.api.Test;
+import org.junit.BeforeClass;
+import org.junit.Test;
 
 import java.lang.reflect.Method;
+import java.nio.file.Path;
 import java.util.Vector;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.Assert.assertEquals;
 
 public class InheritTest {
     private static Class<?> classToTest, classToTestAA, classToTestBB, classToTestCC, classToTestDD;
     private static Object instanceOfClass, instanceOfClassAA, instanceOfClassBB, instanceOfClassCC, instanceOfClassDD;
 
-    @BeforeAll
+    @BeforeClass
     public static void setUpBeforeClass() throws Exception {
-        var classLoader = TestCodegen.createClassLoader();
+        var classLoader = new ByteArrayClassLoader();
 
         var classes = TestCodegen.generateClassFiles(classLoader, "Inherit.jav");
         classToTest = classes.get("Inherit");
@@ -33,72 +35,72 @@ public class InheritTest {
     @Test
     public void testmainAA() throws Exception {
         Method m = classToTestAA.getDeclaredMethod("m", Integer.class);
-        assertEquals("AA", m.invoke(instanceOfClassAA, 5));
+        assertEquals(m.invoke(instanceOfClassAA, 5), "AA");
         Method main = classToTest.getDeclaredMethod("main", classToTestAA, Integer.class);
-        assertEquals("AA", main.invoke(instanceOfClass, instanceOfClassAA, 5));
+        assertEquals(main.invoke(instanceOfClass, instanceOfClassAA, 5), "AA");
     }
 
     @Test
     public void testmainBB() throws Exception {
         Method m = classToTestAA.getDeclaredMethod("m", Integer.class);
-        assertEquals("AA", m.invoke(instanceOfClassBB, 5));
+        assertEquals(m.invoke(instanceOfClassBB, 5), "AA");
         Method main = classToTest.getDeclaredMethod("main", classToTestAA, Integer.class);
-        assertEquals("AA", main.invoke(instanceOfClass, instanceOfClassBB, 5));
+        assertEquals(main.invoke(instanceOfClass, instanceOfClassBB, 5), "AA");
     }
 
     @Test
     public void testmainCC() throws Exception {
         Method m = classToTestCC.getDeclaredMethod("m", Integer.class);
-        assertEquals("CC", m.invoke(instanceOfClassCC, 5));
+        assertEquals(m.invoke(instanceOfClassCC, 5), "CC");
         Method main = classToTest.getDeclaredMethod("main", classToTestCC, Integer.class);
-        assertEquals("CC", main.invoke(instanceOfClass, instanceOfClassCC, 5));
+        assertEquals(main.invoke(instanceOfClass, instanceOfClassCC, 5), "CC");
     }
 
     @Test
     public void testmainDD() throws Exception {
         Method m = classToTestCC.getDeclaredMethod("m", Integer.class);
-        assertEquals("CC", m.invoke(instanceOfClassDD, 5));
+        assertEquals(m.invoke(instanceOfClassDD, 5), "CC");
         Method main = classToTest.getDeclaredMethod("main", classToTestCC, Integer.class);
-        assertEquals("CC", main.invoke(instanceOfClass, instanceOfClassDD, 5));
+        assertEquals(main.invoke(instanceOfClass, instanceOfClassDD, 5), "CC");
     }
 
     @Test
     public void testmainVectorAA() throws Exception {
         Method m = classToTestAA.getDeclaredMethod("m", Integer.class);
-        assertEquals("AA", m.invoke(instanceOfClassAA, 5));
+        assertEquals(m.invoke(instanceOfClassAA, 5), "AA");
         Vector v = new Vector<>();
         v.add(instanceOfClassAA);
         Method main = classToTest.getDeclaredMethod("main", Vector.class, Integer.class);
-        assertEquals("AA", main.invoke(instanceOfClass, v, 5));
+        assertEquals(main.invoke(instanceOfClass, v, 5), "AA");
     }
 
     @Test
     public void testmainVectorBB() throws Exception {
         Method m = classToTestAA.getDeclaredMethod("m", Integer.class);
-        assertEquals("AA", m.invoke(instanceOfClassBB, 5));
+        assertEquals(m.invoke(instanceOfClassBB, 5), "AA");
         Vector v = new Vector<>();
         v.add(instanceOfClassBB);
         Method main = classToTest.getDeclaredMethod("main", Vector.class, Integer.class);
-        assertEquals("AA", main.invoke(instanceOfClass, v, 5));
+        assertEquals(main.invoke(instanceOfClass, v, 5), "AA");
     }
 
     @Test
     public void testmainVectorCC() throws Exception {
         Method m = classToTestCC.getDeclaredMethod("m", Integer.class);
-        assertEquals("CC", m.invoke(instanceOfClassCC, 5));
+        assertEquals(m.invoke(instanceOfClassCC, 5), "CC");
         Vector v = new Vector<>();
         v.add(instanceOfClassCC);
         Method main = classToTest.getDeclaredMethod("main", Vector.class, Integer.class);
-        assertEquals("CC", main.invoke(instanceOfClass, v, 5));
+        assertEquals(main.invoke(instanceOfClass, v, 5), "CC");
     }
 
     @Test
     public void testmainVectorDD() throws Exception {
         Method m = classToTestCC.getDeclaredMethod("m", Integer.class);
-        assertEquals("CC", m.invoke(instanceOfClassDD, 5));
+        assertEquals(m.invoke(instanceOfClassDD, 5), "CC");
         Vector v = new Vector<>();
         v.add(instanceOfClassDD);
         Method main = classToTest.getDeclaredMethod("main", Vector.class, Integer.class);
-        assertEquals("CC", main.invoke(instanceOfClass, v, 5));
+        assertEquals(main.invoke(instanceOfClass, v, 5), "CC");
     }
 }

src/test/java/targetast/InheritTest2.java

@@ -1,22 +1,23 @@
 package targetast;
 
-import org.junit.jupiter.api.BeforeAll;
+import de.dhbwstuttgart.environment.ByteArrayClassLoader;
-import org.junit.jupiter.api.Disabled;
+import org.junit.BeforeClass;
-import org.junit.jupiter.api.Test;
+import org.junit.Ignore;
+import org.junit.Test;
 
 import java.lang.reflect.Method;
 import java.util.Vector;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.Assert.assertEquals;
 
-@Disabled("FIXME")
+@Ignore("FIXME")
 public class InheritTest2 {
     private static Class<?> classToTest, classToTestAA, classToTestBB, classToTestCC, classToTestDD;
     private static Object instanceOfClass, instanceOfClassAA, instanceOfClassBB, instanceOfClassCC, instanceOfClassDD;
 
-    @BeforeAll
+    @BeforeClass
     public static void setUpBeforeClass() throws Exception {
-        var classLoader = TestCodegen.createClassLoader();
+        var classLoader = new ByteArrayClassLoader();
         classToTest   = TestCodegen.generateClassFiles(classLoader, "Inherit2.jav").get("Inherit2");
         classToTestAA = TestCodegen.generateClassFiles(classLoader, "AA.jav").get("AA");
         classToTestBB = TestCodegen.generateClassFiles(classLoader, "BB.jav").get("BB");

src/test/java/targetast/LessEqualTest.java

@@ -1,20 +1,21 @@
 package targetast;
 
-import org.junit.jupiter.api.BeforeAll;
+import de.dhbwstuttgart.environment.ByteArrayClassLoader;
-import org.junit.jupiter.api.Test;
+import org.junit.BeforeClass;
+import org.junit.Test;
 
 import java.lang.reflect.Method;
 
-import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.Assert.assertFalse;
-import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.Assert.assertTrue;
 
 public class LessEqualTest {
     static Class<?> classToTest;
     static Object instance;
 
-    @BeforeAll
+    @BeforeClass
     public static void beforeClass() throws Exception {
-        var classFiles = TestCodegen.generateClassFiles(TestCodegen.createClassLoader(), "LessEqual.jav");
+        var classFiles = TestCodegen.generateClassFiles(new ByteArrayClassLoader(), "LessEqual.jav");
         classToTest = classFiles.get("LessEqual");
         instance = classToTest.getDeclaredConstructor().newInstance();
     }

src/test/java/targetast/LessThanTest.java

@@ -1,20 +1,21 @@
 package targetast;
 
-import org.junit.jupiter.api.BeforeAll;
+import de.dhbwstuttgart.environment.ByteArrayClassLoader;
-import org.junit.jupiter.api.Test;
+import org.junit.BeforeClass;
+import org.junit.Test;
 
 import java.lang.reflect.Method;
 
-import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.Assert.assertFalse;
-import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.Assert.assertTrue;
 
 public class LessThanTest {
     static Class<?> classToTest;
     static Object instance;
 
-    @BeforeAll
+    @BeforeClass
     public static void beforeClass() throws Exception {
-        var classFiles = TestCodegen.generateClassFiles(TestCodegen.createClassLoader(), "LessThan.jav");
+        var classFiles = TestCodegen.generateClassFiles(new ByteArrayClassLoader(), "LessThan.jav");
         classToTest = classFiles.get("LessThan");
         instance = classToTest.getDeclaredConstructor().newInstance();
     }

src/test/java/targetast/OLTest.java

@@ -1,12 +1,12 @@
 package targetast;
 
-import org.junit.jupiter.api.BeforeAll;
+import de.dhbwstuttgart.environment.ByteArrayClassLoader;
-import org.junit.jupiter.api.Test;
+import org.junit.BeforeClass;
+import org.junit.Test;
 
 import java.lang.reflect.Method;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.Assert.assertEquals;
-
 
 public class OLTest {
 	private static Class<?> classToTest;
@@ -14,9 +14,9 @@ public class OLTest {
 	private static Object instanceOfClass;
 	private static Object instanceOfClass1;
 	
-	@BeforeAll
+	@BeforeClass
 	public static void setUpBeforeClass() throws Exception {
-		var classFiles = TestCodegen.generateClassFiles(TestCodegen.createClassLoader(), "OL.jav");
+		var classFiles = TestCodegen.generateClassFiles(new ByteArrayClassLoader(), "OL.jav");
 		classToTest = classFiles.get("OL");
 		instanceOfClass = classToTest.getDeclaredConstructor().newInstance();
 		classToTest1 = classFiles.get("OLMain");

src/test/java/targetast/PostIncTest.java

@@ -1,19 +1,20 @@
 package targetast;
 
-import org.junit.jupiter.api.BeforeAll;
+import de.dhbwstuttgart.environment.ByteArrayClassLoader;
-import org.junit.jupiter.api.Test;
+import org.junit.BeforeClass;
+import org.junit.Test;
 
 import java.lang.reflect.Method;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.Assert.assertEquals;
 
 public class PostIncTest {
 	private static Class<?> classToTest;
 	private static Object instanceOfClass;
 	
-	@BeforeAll
+	@BeforeClass
 	public static void setUpBeforeClass() throws Exception {
-		var classFiles = TestCodegen.generateClassFiles(TestCodegen.createClassLoader(), "PostIncDec.jav");
+		var classFiles = TestCodegen.generateClassFiles(new ByteArrayClassLoader(), "PostIncDec.jav");
 		classToTest = classFiles.get("PostIncDec");
 		instanceOfClass = classToTest.getDeclaredConstructor().newInstance();
 	}

src/test/java/targetast/PreIncTest.java

@@ -1,19 +1,20 @@
 package targetast;
 
-import org.junit.jupiter.api.BeforeAll;
+import de.dhbwstuttgart.environment.ByteArrayClassLoader;
-import org.junit.jupiter.api.Test;
+import org.junit.BeforeClass;
+import org.junit.Test;
 
 import java.lang.reflect.Method;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.Assert.assertEquals;
 
 public class PreIncTest {
 	private static Class<?> classToTest;
 	private static Object instanceOfClass;
 	
-	@BeforeAll
+	@BeforeClass
 	public static void setUpBeforeClass() throws Exception {
-		var classFiles = TestCodegen.generateClassFiles(TestCodegen.createClassLoader(), "PreInc.jav");
+		var classFiles = TestCodegen.generateClassFiles(new ByteArrayClassLoader(), "PreInc.jav");
 		classToTest = classFiles.get("PreInc");
 		instanceOfClass = classToTest.getDeclaredConstructor().newInstance();
 	}