Änderung von OLFun.jav zum originalen Sourcecode.

Rückgabetypen dieser werden nicht korrekt aufgelöst.
Dies muss geändert werden.
Deskriptoren nicht angepasst.
Da Basis-Interface FunN$$ mit erstellt wird, sind Tests noch korrekt.

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

@@ -584,6 +584,7 @@ public class BytecodeGenMethod implements StatementVisitor {
 		}
 	}
 
+	//ToDo Etienne: Für Type Erasure relevant?!
 	@Override
 	public void visit(LambdaExpression lambdaExpression) {
 		this.lamCounter++;
@@ -653,6 +654,7 @@ public class BytecodeGenMethod implements StatementVisitor {
 //		generateBCForFunN(lambdaExpression, typeErasure);
 	}
 
+	//ToDo Etienne: Relevant?!
 	private String addUsedVarsToDesugaredMethodDescriptor(String lamDesc) {
 		String newDesc = "(";
 		int pos = 0;
@@ -674,6 +676,7 @@ public class BytecodeGenMethod implements StatementVisitor {
 		}
 	}
 
+	//ToDo Etienne: Relevant?!
 	private String createDescriptorWithTypeErasure(LambdaExpression lambdaExpression) {
 		String typeErasure = "(";
 		Iterator<FormalParameter> itr = lambdaExpression.params.iterator();
@@ -767,6 +770,7 @@ public class BytecodeGenMethod implements StatementVisitor {
 		// This will be used if the class is not standard class (not in API)
 		ClassLoader cLoader2;
 
+		//ToDo methodCallType wird nicht korrekt resolved, da kein Constraint vorhanden ist
 		String methCallType = resultSet.resolveType(methodCall.getType()).resolvedType.acceptTV(new TypeToDescriptor());
 		String[] typesOfParams = getTypes(methodCall.arglist.getArguments());
 		try {
@@ -811,11 +815,13 @@ public class BytecodeGenMethod implements StatementVisitor {
 					} catch (NotInCurrentPackageException | NotFoundException e) {
 						e.printStackTrace();
 					}
+					//ToDo Etienne: Für Type Erasure wichtig?!
 				} else if(!helper.isInCurrPkg(clazz)){
 					if(clazz.contains(CONSTANTS.$$)) {
+						//ToDo Methoden Deskriptor neu setzen
+						//ToDo Receiver neu setzen?!
 						mDesc = helper.getDescriptorOfApplyMethod(methCallType);
-						helper.generateBCForFunN(mDesc);
-//						mDesc = helper.generateBCForFunN(methCallType,typesOfParams);
+						helper.generateBCForFunN(typesOfParams, methCallType);
 					}else {
 						try {
 							cLoader2 = new DirectoryClassLoader(path, classLoader);
@@ -872,6 +878,7 @@ public class BytecodeGenMethod implements StatementVisitor {
 			if(parentBinary || isBinaryExp) {
 				doUnboxing(resolver.getResolvedType(methodCall.getType()));
 			}
+			//ToDo Etienne: Für Type Erasure wichtig?!
 		} else if(receiverName.contains(CONSTANTS.$$) && !methCallType.equals(Type.getInternalName(Object.class))) {
 			helper.createCheckCast(methodCall,mv);
 		}
@@ -899,6 +906,7 @@ public class BytecodeGenMethod implements StatementVisitor {
 		}
 	}
 
+	//ToDo Etienne: Für Type Erasure wichtig?!
 	private void visitInvokeInsn(MethodCall methodCall, String receiverName, java.lang.reflect.Method methodRefl, String clazz, String mDesc, String receiverRefl) {
 		// is methodCall.receiver functional Interface)?
 		if (varsFunInterface.contains(methodCall.receiver.getType()) || (methodRefl!= null && receiverRefl.contains("interface")) ||

src/main/java/de/dhbwstuttgart/bytecode/descriptor/DescriptorToString.java

@@ -68,6 +68,7 @@ public class DescriptorToString implements DescriptorVisitor, CONSTANTS {
 					}
 				}
 			}
+			//ToDo Etienne: Für Type Erasure wichtig?!
 			//TODO: generate a class java%% ... %%
 			else if(resultSet.resolveType(fp.getType()).resolvedType.acceptTV(new TypeToDescriptor()).contains(CONSTANTS.ANGLEBRACKET)){
 				desc += "L"+resultSet.resolveType(fp.getType()).resolvedType.toString().replace(".", "$$").replace(CONSTANTS.ANGLEBRACKET, "$$$").replace(">", "$$$")+ ";";
@@ -207,7 +208,7 @@ public class DescriptorToString implements DescriptorVisitor, CONSTANTS {
 		String desc = "(";
 		for(Expression e : methodFromMethodCall.getArgList().getArguments()) {
 			String d = resultSet.resolveType(e.getType()).resolvedType.acceptTV(new TypeToDescriptor());
-			
+			//ToDo Etienne: Ändern von $$ nötig für TypeErasure?
 			if(d.contains(CONSTANTS.TPH) ||d.contains(CONSTANTS.ANGLEBRACKET) || methodFromMethodCall.getReceiverName().contains("$$")) {
 				desc += "L"+Type.getInternalName(Object.class)+ ";";
 			}else {
@@ -225,6 +226,7 @@ public class DescriptorToString implements DescriptorVisitor, CONSTANTS {
 		System.out.println("DescriptorToString retType = " + retType);
 		if(retType.equals(CONSTANTS.VOID)) {
 			desc += ")V";
+			//ToDo Etienne: Ändern von $$ nötig für TypeErasure?
 		}else if(retType.contains(CONSTANTS.TPH)|| retType.contains(CONSTANTS.ANGLEBRACKET) || methodFromMethodCall.getReceiverName().contains("$$")){
 			desc += ")L"+Type.getInternalName(Object.class)+ ";";
 		}else {
@@ -240,6 +242,7 @@ public class DescriptorToString implements DescriptorVisitor, CONSTANTS {
 		return desc;
 	}
 
+	//ToDo Etienne: Ändern für TypeErasure
 	@Override
 	public String createDescForFunN(ArgumentList argumentList, String returnType) {
 		Iterator<Expression> itr1 = argumentList.getArguments().iterator();

src/main/java/de/dhbwstuttgart/bytecode/descriptor/DescriptorVisitor.java

@@ -11,7 +11,9 @@ public interface DescriptorVisitor {
 	String visit(NormalMethod method);
 	String visit(NormalConstructor constructor);
 	String visit(Lambda lambdaExpression);
+	//ToDo Etienne: Was ist SamMethod?
 	String visit(SamMethod samMethod);
+	//ToDo Etienne: Was ist MethodFromMethodCall?
 	String visit(MethodFromMethodCall methodFromMethodCall);
 	String createDescForFunN(ArgumentList argumentList, String returnType);
 }

src/main/java/de/dhbwstuttgart/bytecode/signature/Signature.java

@@ -136,6 +136,7 @@ public class Signature {
 		defineGenericsFromConstraints(constraints,genericsAndBoundsMethod);
 	}
 
+	//ToDo Etienne: für TypeErasure anschauen
 	private void createSignatureForFunN(int numberOfParams, String to, String[] paramTypes) {
 		defineTypeVariablesForParametersOfFunN(numberOfParams);
 
@@ -147,6 +148,7 @@ public class Signature {
 
 	}
 
+	//ToDo Etienne: für TypeErasure anschauen
 	private void createSignatureForFunN(int numberOfParams) {
 
 		defineTypeVariablesForParametersOfFunN(numberOfParams);
@@ -202,6 +204,7 @@ public class Signature {
 			if (r instanceof GenericRefType) {
 				sv.visitTypeVariable(sig2);
 			} else if (!(r instanceof TypePlaceholder)) {
+				//ToDo Etienne: Wichtig für Type Erasure?!
 				if (sig2.contains(SPECIAL_CHAR_FOR_FUN)) {
 					sv.visitInterface().visitClassType(sig2.substring(1));
 				} else {
@@ -266,6 +269,7 @@ public class Signature {
 	}
 
 	private void checkInnerSignatureOfWildCard(SignatureVisitor sv, String sigInner, int length, char superOrExtendsChar) {
+		//ToDo Etienne: Wichtig für Type Erasure?!
 		if (sigInner.contains(SPECIAL_CHAR_FOR_FUN)) {
 			sv.visitTypeArgument(superOrExtendsChar).visitInterface().visitClassType(sigInner.substring(1, length));
 		} else {

src/main/java/de/dhbwstuttgart/bytecode/signature/TypeToSignature.java

@@ -99,4 +99,34 @@ public class TypeToSignature implements TypeVisitor<String> {
 				.filter(c -> c.getConstraint().getLeft().equals(tph) || c.getEqualsTPHs().contains(tph))
 				.findFirst();
 	}
+
+	/**
+	 * //ToDo beschreiben
+	 *
+	 * @param type
+	 * @return
+	 *
+	 * @since Studienarbeit Type Erasure
+	 * @author Etienne Zink
+	 */
+	public String visit(RefTypeOrTPHOrWildcardOrGeneric type){
+		String returnString = "";
+		if (type instanceof GenericRefType){
+			GenericRefType genericRefType = (GenericRefType) type;
+			returnString += visit(genericRefType);
+		} else if (type instanceof RefType){
+			RefType refType = (RefType) type;
+			returnString += visit(refType);
+		} else if (type instanceof TypePlaceholder){
+			TypePlaceholder typePlaceholder = (TypePlaceholder) type;
+			returnString += visit(typePlaceholder);
+		} else if (type instanceof SuperWildcardType){
+			SuperWildcardType superWildcardType = (SuperWildcardType) type;
+			returnString += visit(superWildcardType);
+		} else if (type instanceof ExtendsWildcardType) {
+			ExtendsWildcardType extendsWildcardType = (ExtendsWildcardType) type;
+			returnString += visit(extendsWildcardType);
+		}
+		return returnString;
+	}
 }

src/main/java/de/dhbwstuttgart/bytecode/utilities/ByteCodeForFunNGenerator.java

@@ -1,25 +1,38 @@
 package de.dhbwstuttgart.bytecode.utilities;
 
 import de.dhbwstuttgart.bytecode.signature.Signature;
+import de.dhbwstuttgart.bytecode.signature.TypeToSignature;
 import de.dhbwstuttgart.syntaxtree.FormalParameter;
 import de.dhbwstuttgart.syntaxtree.statement.ArgumentList;
 import de.dhbwstuttgart.syntaxtree.statement.Expression;
 import de.dhbwstuttgart.syntaxtree.statement.LambdaExpression;
+import de.dhbwstuttgart.syntaxtree.type.*;
 import org.objectweb.asm.ClassWriter;
 import org.objectweb.asm.MethodVisitor;
-import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.Type;
 import org.objectweb.asm.signature.SignatureVisitor;
 import org.objectweb.asm.signature.SignatureWriter;
 
-import java.io.File;
-import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
-import java.io.IOException;
+import java.io.*;
+import java.sql.Ref;
+import java.util.HashSet;
 import java.util.Iterator;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import static org.objectweb.asm.Opcodes.*;
 
 public class ByteCodeForFunNGenerator {
 
+    /**
+     * HashSet which contains the parameter number for which already a FunN$$ interface was generated.
+     *
+     * @since Studienarbeit Type Erasure
+     * @author Etienne Zink
+     */
+    private static HashSet<Integer> alreadyGeneratedFunN = new HashSet<>();
+
+    //ToDo Etienne: wird in Test OLFun nicht verwendet!
     public static void generateBCForFunN(LambdaExpression lambdaExpression, String methDesc, File path) {
         ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
 
@@ -38,57 +51,121 @@ public class ByteCodeForFunNGenerator {
         // ")"+lam.getReturn.getBounds
         Signature sig = new Signature(numberOfParams);
         String name = CONSTANTS.FUN + numberOfParams + CONSTANTS.$$;
-        classWriter.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC+Opcodes.ACC_INTERFACE + Opcodes.ACC_ABSTRACT, name, sig.toString(),
+        classWriter.visit(V1_8, ACC_PUBLIC + ACC_INTERFACE + ACC_ABSTRACT, name, sig.toString(),
                 Type.getInternalName(Object.class), null);
-        MethodVisitor mvApply = classWriter.visitMethod(Opcodes.ACC_PUBLIC + Opcodes.ACC_ABSTRACT, "apply", methDesc,
+        MethodVisitor mvApply = classWriter.visitMethod(ACC_PUBLIC + ACC_ABSTRACT, "apply", methDesc,
                 methSig.toString(), null);
         mvApply.visitEnd();
-        writeClassFile(classWriter.toByteArray(), name, path);
+        writeClassFile(name, classWriter.toByteArray(), path);
     }
 
-    public static void generateBCForFunN(ArgumentList argumentList, String methDesc, File path) {
+    /**
+     * //ToDo beschreiben
+     *
+     * @param typesOfFormalParameters
+     * @param returnType
+     * @param path
+     *
+     * @since Studienarbeit Type Erasure
+     * @author Etienne Zink
+     */
+    public static void generateBCForFunN(String[] typesOfFormalParameters, String returnType, File path) {
         ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
+        int numberOfParameters = typesOfFormalParameters.length;
+        generateSuperFunNInterface(numberOfParameters, path);
 
-        SignatureWriter methSig = new SignatureWriter();
+        String className = getBaseFunClassname(numberOfParameters);
+        String classSignature = String.format("L%s;L%s<", Type.getInternalName(Object.class), className);
 
-        int numberOfParams = 0;
-        SignatureVisitor paramVisitor = methSig.visitParameterType();
-        Iterator<Expression> itr1 = argumentList.getArguments().iterator();
-
-        while(itr1.hasNext()) {
-            numberOfParams++;
-            // getBounds
-            paramVisitor.visitTypeVariable(CONSTANTS.T + numberOfParams);
-            itr1.next();
+        //ToDo testen ob der Klassenname und -signatur so passt
+        for (String typeOfFormalParameter: typesOfFormalParameters) {
+            className += String.format("%s$_$", typeOfFormalParameter);
+            classSignature += String.format("L%s;", typeOfFormalParameter);
         }
+        className += returnType;
+        className = className.replace('/', '$');
+        classSignature += String.format("L%s>;", returnType);
 
-        methSig.visitReturnType().visitTypeVariable(CONSTANTS.R);
-        // ")"+lam.getReturn.getBounds
-        Signature sig = new Signature(numberOfParams);
-        String name = CONSTANTS.FUN + numberOfParams + CONSTANTS.$$;
-        classWriter.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC+Opcodes.ACC_INTERFACE + Opcodes.ACC_ABSTRACT, name, sig.toString(),
-                Type.getInternalName(Object.class), null);
-        MethodVisitor mvApply = classWriter.visitMethod(Opcodes.ACC_PUBLIC + Opcodes.ACC_ABSTRACT, "apply", methDesc,
-                methSig.toString(), null);
-        mvApply.visitEnd();
-        writeClassFile(classWriter.toByteArray(), name, path);
+        System.out.println("Generated className: " + className);
+        System.out.println("Generated signature: " + classSignature);
+
+        classWriter.visit(V1_8, ACC_PUBLIC | ACC_INTERFACE | ACC_ABSTRACT, className, classSignature,
+                Type.getInternalName(Object.class), new String[]{getBaseFunClassname(numberOfParameters)});
+        writeClassFile(className, classWriter.toByteArray(), path);
     }
 
+    /**
+     * Function which generates a {@code class-File} for the super interface
+     * Fun<{@code numberOfParameters}>$$ if it doesn't exist already.
+     *
+     * @param numberOfParameters
+     * @return {@code true}, iff the {@code class-File} exists after this method invocation
+     * based on {@link #alreadyGeneratedFunN alreadyGeneratedFunN}.
+     *
+     * @since Studienarbeit Type Erase
+     * @author Etienne Zink
+     */
+    public static boolean generateSuperFunNInterface(int numberOfParameters, File path){
+        if(alreadyGeneratedFunN.contains(numberOfParameters)) return true;
+        //ToDo Etienne: Generierung der Signaturen/Deskriptoren vielleicht auslagern? Bzw. schauen ob nicht schon vorhanden und anpassen!
+        String className = getBaseFunClassname(numberOfParameters);
+        String classSignature = "<";
+        String methodSignature = "(";
+        String methodDescriptor = "(";
+        for (int parameter = 1; parameter <= numberOfParameters; parameter++) {
+            classSignature += String.format("T%d:L%s;", parameter, Type.getInternalName(Object.class));
+            methodSignature += String.format("TT%d;", parameter);
+            methodDescriptor += String.format("L%s;", Type.getInternalName(Object.class));
+        }
+        classSignature += String.format("R:L%s;>L%s;",Type.getInternalName(Object.class),Type.getInternalName(Object.class));
+        methodSignature += ")TR;";
+        methodDescriptor += String.format(")L%s;",Type.getInternalName(Object.class));
 
-    public static void writeClassFile(byte[] bytecode, String name, File path) {
-        FileOutputStream output;
-        try {
-            System.out.println("generating " + name + ".class file...");
-            output = new FileOutputStream(
-                    new File(path , name + CONSTANTS.EXTENSIONCLASS));
+        ClassWriter classWriter = new ClassWriter(0);
+        classWriter.visit(V1_8, ACC_PUBLIC | ACC_ABSTRACT | ACC_INTERFACE, className, classSignature, Type.getInternalName(Object.class), null);
+
+        MethodVisitor methodVisitor = classWriter.visitMethod(ACC_PUBLIC | ACC_ABSTRACT, "apply", methodDescriptor, methodSignature, null);
+        methodVisitor.visitEnd();
+        classWriter.visitEnd();
+
+        byte[] bytecode = classWriter.toByteArray();
+        if(writeClassFile(className, bytecode, path)) {
+            alreadyGeneratedFunN.add(numberOfParameters);
+        }
+        return alreadyGeneratedFunN.contains(numberOfParameters);
+    }
+
+    /**
+     *
+     * @param countParameters
+     * @return the String of the super Fun$$ type
+     *
+     * @since Studienarbeit Type Erasure
+     * @author Etienne Zink
+     */
+    private static String getBaseFunClassname(int countParameters){
+        return String.format("Fun%d$$", countParameters);
+    }
+
+    /**
+     * Generates a {@code class-File} for the class {@code className} with the {@code bytecode}.
+     *
+     * @param className of the class to generate
+     * @param bytecode of the class
+     * @param directory where the class should be saved to
+     * @return {@code true}, iff the {@code class-File} could be generated.
+     *
+     * @since Studienarbeit Type Erasure
+     * @author Etienne Zink
+     */
+    private static boolean writeClassFile(String className, byte[] bytecode, File directory) {
+        try (FileOutputStream output = new FileOutputStream(new File(directory , className + CONSTANTS.EXTENSIONCLASS))){
             output.write(bytecode);
-            output.close();
-            System.out.println(name + ".class file generated");
-        } catch (FileNotFoundException e) {
-            e.printStackTrace();
-        } catch (IOException e) {
+            output.flush();
+            return true;
+        } catch (Exception e) {
             e.printStackTrace();
         }
-
+        return false;
     }
-}
+}

src/main/java/de/dhbwstuttgart/bytecode/utilities/MethodCallHelper.java

@@ -220,10 +220,13 @@ public class MethodCallHelper {
 		}
 	}
 
-	public void generateBCForFunN(String methodDescriptor) {
-		ByteCodeForFunNGenerator.generateBCForFunN(methCall.arglist,methodDescriptor,path);
+	//ToDo Etienne: Für Type Erasure wichtig?!
+	public void generateBCForFunN(String[] typesOfFormalParams, String receiverType) {
+		//ToDo return Descriptor auf apply Methode?
+		ByteCodeForFunNGenerator.generateBCForFunN(typesOfFormalParams, receiverType,path);
 	}
 
+	//ToDo Etienne: Für Type Erasure wichtig
 	public String getDescriptorOfApplyMethod(String methodCallType) {
 		return new DescriptorToString().createDescForFunN(methCall.arglist, methodCallType);
 	}

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

@@ -884,6 +884,7 @@ public class JavaTXCompiler {
 		return result;
 	}
 
+	//ToDo Etienne: Für Type Erasure wichtig?! (alle generatedBytecode-Methoden?)
 	public void generateBytecode() throws ClassNotFoundException, IOException, BytecodeGeneratorError {
 		generateBytecode((File) null);
 	}

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

@@ -185,6 +185,7 @@ public class TypeGenerator {
             }else{
             Pattern p = Pattern.compile("Fun(\\d+)[$][$]");
             Matcher m = p.matcher(name);
+            //ToDo Etienne: Für Type Erasure wichtig?!
             if (m.matches()) {//es ist FunN$$-Type 
                 return new RefType(new JavaClassName(name), convert(typeArguments, reg, generics), offset);
             } else {

src/main/java/de/dhbwstuttgart/syntaxtree/type/WildcardType.java

@@ -9,6 +9,7 @@ import org.antlr.v4.runtime.Token;
  * 
  */
 
+//ToDo Etienne: Wieso abstrakte Klasse? -> Dadurch keine Inferenz mit ? möglich!
 public abstract class WildcardType extends RefTypeOrTPHOrWildcardOrGeneric {
 	
 	protected RefTypeOrTPHOrWildcardOrGeneric innerType = null;

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

@@ -63,6 +63,7 @@ public class MethodAssumption extends Assumption{
             //Die Generics werden alle zu TPHs umgewandelt.
             params.add(resolver.resolve(new GenericRefType(gtv.getName(), new NullToken())));
         }
+        //ToDo Etienne: Für Type Erasure wichtig?!
         RefTypeOrTPHOrWildcardOrGeneric receiverType;
         if(receiver instanceof FunNClass){
             receiverType = new RefType(new JavaClassName(receiver.getClassName().toString()+"$$"), params, new NullToken()); // new FunN(params);

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

@@ -68,6 +68,7 @@ public class TYPEStmt implements StatementVisitor{
         lambdaParams.add(tphRetType);
         //lambdaParams.add(0,tphRetType);
         constraintsSet.addUndConstraint(
+                //ToDo Etienne: Für Type Erasure wichtig?!
                 new Pair(lambdaExpression.getType(),
                 		new RefType(new JavaClassName("Fun"+(lambdaParams.size()-1)+"$$"), lambdaParams, new NullToken()),
                         //new FunN(lambdaParams),

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

@@ -21,6 +21,7 @@ public class FunNType extends UnifyType {
 	/**
 	 * Creates a FunN-Type with the specified TypeParameters.
 	 */
+	//ToDo Etienne: Für Type Erasure wichtig?!
 	protected FunNType(TypeParams p) {
 		super("Fun"+(p.size()-1)+"$$", p);
 	}

src/test/java/bytecode/OLFunTest.java

@@ -1,52 +1,65 @@
 package bytecode;
 
-import static org.junit.Assert.assertEquals;
-
 import java.io.File;
-import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.net.URL;
 import java.net.URLClassLoader;
 
-import org.junit.Test;
-
+import general.TestCleanUp;
+import org.junit.*;
 import de.dhbwstuttgart.core.JavaTXCompiler;
+import static org.junit.Assert.*;
 
+/**
+ * Test which only checks if the class {@code OLFun} was correctly compiled.
+ * This is achived by verifying the existence of the three implementations of {@code m}.
+ *
+ * @since Studienarbeit Type Erasure
+ * @author Etienne Zink
+ */
 public class OLFunTest {
 	private static String path;
 	private static File fileToTest;
 	private static JavaTXCompiler compiler;
 	private static ClassLoader loader;
 	private static Class<?> classToTest;
-	private static String pathToClassFile;
+	private static Class<?> classFun1;
 	private static Object instanceOfClass;
+
+	private static String generatedByteCodeDirectory = System.getProperty("user.dir") + "/src/test/resources/testBytecode/generatedBC/";
 	
-	@Test
-	public void generateBC() throws Exception {
+	@BeforeClass
+	public static void setUp() throws Exception {
 		path = System.getProperty("user.dir")+"/src/test/resources/bytecode/javFiles/OLFun.jav";
 		fileToTest = new File(path);
 		compiler = new JavaTXCompiler(fileToTest);
-		compiler.generateBytecode(System.getProperty("user.dir")+"/src/test/resources/testBytecode/generatedBC/");
-		pathToClassFile = System.getProperty("user.dir")+"/src/test/resources/testBytecode/generatedBC/";
-		loader = new URLClassLoader(new URL[] {new URL("file://"+pathToClassFile)});
+		compiler.generateBytecode(generatedByteCodeDirectory);
+		loader = new URLClassLoader(new URL[] {new URL("file://"+generatedByteCodeDirectory)});
 		classToTest = loader.loadClass("OLFun");
-		/*
+		classFun1 = loader.loadClass("Fun1$$");
 		instanceOfClass = classToTest.getDeclaredConstructor().newInstance();
-
-		Method m = classToTest.getDeclaredMethod("m");
-		Class<?> lambda = m.invoke(instanceOfClass).getClass();
-		Method apply = lambda.getMethod("apply", Object.class);
-
-		// Damit man auf die Methode zugreifen kann
-		apply.setAccessible(true);
-
-		Integer i = 77;
-		
-		Integer result = (Integer) apply.invoke(m.invoke(instanceOfClass), i); 
-
-		assertEquals(77, result);
-		*/
 	}
 
+	@Test
+	public void mExistsWithInteger() throws Exception{
+		Method m = classToTest.getDeclaredMethod("m", classFun1 ,Integer.class);
+		assertNotNull(m);
+	}
 
+	@Test
+	public void mExistsWithString() throws Exception{
+		Method m = classToTest.getDeclaredMethod("m", classFun1 ,String.class);
+		assertNotNull(m);
+	}
+
+	@Test
+	public void mExistsWithDouble() throws Exception{
+		Method m = classToTest.getDeclaredMethod("m", classFun1 ,Double.class);
+		assertNotNull(m);
+	}
+
+	@AfterClass
+	public static void cleanUp(){
+		TestCleanUp.cleanUpDirectory(new File(generatedByteCodeDirectory), f -> f.getName().contains(".class"));
+	}
 }

src/test/java/general/TestCleanUp.java

@@ -0,0 +1,14 @@
+package general;
+
+import java.io.File;
+import java.io.FileFilter;
+
+public class TestCleanUp {
+
+    public static void cleanUpDirectory(File directory, FileFilter fileFilter){
+        if(!directory.isDirectory()) throw new RuntimeException("Directory for bytecode generation is wrong!");
+        for (File file: directory.listFiles(fileFilter)) {
+            file.delete();
+        }
+    }
+}

src/test/resources/bytecode/javFiles/OLFun.jav

@@ -10,7 +10,6 @@ import java.lang.Boolean;
 public class OLFun    {
 
 	//f = x -> {return x + x;};
-	
 	m(f, x) {
 		x = f.apply(x+x);
 	}