diff --git a/src/de/dhbwstuttgart/core/JavaTXCompiler.java b/src/de/dhbwstuttgart/core/JavaTXCompiler.java
index 6e7e6516..034ca37d 100644
--- a/src/de/dhbwstuttgart/core/JavaTXCompiler.java
+++ b/src/de/dhbwstuttgart/core/JavaTXCompiler.java
@@ -1,12 +1,16 @@
 package de.dhbwstuttgart.core;
 
 import de.dhbwstuttgart.environment.CompilationEnvironment;
+import de.dhbwstuttgart.environment.PackageCrawler;
 import de.dhbwstuttgart.parser.JavaTXParser;
 import de.dhbwstuttgart.parser.scope.GenericsRegistry;
 import de.dhbwstuttgart.parser.SyntaxTreeGenerator.SyntaxTreeGenerator;
 import de.dhbwstuttgart.parser.antlr.Java8Parser.CompilationUnitContext;
+import de.dhbwstuttgart.parser.scope.JavaClassName;
+import de.dhbwstuttgart.parser.scope.JavaClassRegistry;
 import de.dhbwstuttgart.syntaxtree.ClassOrInterface;
 import de.dhbwstuttgart.syntaxtree.SourceFile;
+import de.dhbwstuttgart.syntaxtree.factory.ASTFactory;
 import de.dhbwstuttgart.syntaxtree.factory.UnifyTypeFactory;
 import de.dhbwstuttgart.syntaxtree.type.TypePlaceholder;
 import de.dhbwstuttgart.typeinference.constraints.Constraint;
@@ -39,12 +43,22 @@ public class JavaTXCompiler {
         }
     }
 
-    public List<ResultSet> typeInference(){
+    public List<ResultSet> typeInference() throws ClassNotFoundException {
         List<ClassOrInterface> allClasses = new ArrayList<>();//environment.getAllAvailableClasses();
         for(SourceFile sf : sourceFiles.values()){
             allClasses.addAll(sf.getClasses());
         }
-        FiniteClosure finiteClosure = UnifyTypeFactory.generateFC(allClasses);
+        List<ClassOrInterface> importedClasses = new ArrayList<>();
+        //Alle Importierten Klassen in allen geparsten Sourcefiles kommen ins FC
+        for(File forSourceFile : sourceFiles.keySet())
+            for(JavaClassName name : sourceFiles.get(forSourceFile).getImports()){
+                ClassOrInterface importedClass = ASTFactory.createClass(
+                        ClassLoader.getSystemClassLoader().loadClass(name.toString()));
+                importedClasses.add(importedClass);
+            }
+        allClasses.addAll(importedClasses);
+        FiniteClosure finiteClosure =  UnifyTypeFactory.generateFC(allClasses);
+
         final ConstraintSet<Pair> cons = new TYPE(sourceFiles.values(), allClasses).getConstraints();
         ConstraintSet<UnifyPair> unifyCons = UnifyTypeFactory.convert(cons);
 
@@ -56,9 +70,9 @@ public class JavaTXCompiler {
                 xConsSet.addAll(constraint);
             }
 
-            System.out.println(xConsSet);
+            //System.out.println(xConsSet);
             Set<Set<UnifyPair>> result = unify.unify(xConsSet, finiteClosure);
-            System.out.println("RESULT: " + result);
+            //System.out.println("RESULT: " + result);
             results.addAll(result);
         }
         return results.stream().map((unifyPairs ->
diff --git a/src/de/dhbwstuttgart/syntaxtree/ClassOrInterface.java b/src/de/dhbwstuttgart/syntaxtree/ClassOrInterface.java
index 4dd9081d..540bc993 100644
--- a/src/de/dhbwstuttgart/syntaxtree/ClassOrInterface.java
+++ b/src/de/dhbwstuttgart/syntaxtree/ClassOrInterface.java
@@ -24,13 +24,13 @@ public class ClassOrInterface extends SyntaxTreeNode implements TypeScope{
   private List<Field> fields = new ArrayList<>();
   private List<Method> methods = new ArrayList<>();
   private GenericDeclarationList genericClassParameters;
-  private RefTypeOrTPHOrWildcardOrGeneric superClass;
+  private RefType superClass;
   protected boolean isInterface;
   private List<? extends RefTypeOrTPHOrWildcardOrGeneric> implementedInterfaces;
   private List<Constructor> constructors;
 
   public ClassOrInterface(int modifiers, JavaClassName name, List<Field> fielddecl, List<Method> methods, List<Constructor> constructors, GenericDeclarationList genericClassParameters,
-                          RefTypeOrTPHOrWildcardOrGeneric superClass, Boolean isInterface, List<? extends RefTypeOrTPHOrWildcardOrGeneric> implementedInterfaces, Token offset){
+                          RefType superClass, Boolean isInterface, List<? extends RefTypeOrTPHOrWildcardOrGeneric> implementedInterfaces, Token offset){
     super(offset);
       this.modifiers = modifiers;
       this.name = name;
@@ -74,7 +74,7 @@ public class ClassOrInterface extends SyntaxTreeNode implements TypeScope{
     return new RefType(name, params, offset);
   }
 
-  public RefTypeOrTPHOrWildcardOrGeneric getSuperClass() {
+  public RefType getSuperClass() {
     return superClass;
   }
 
diff --git a/src/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java b/src/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java
index af672837..2005a387 100644
--- a/src/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java
+++ b/src/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java
@@ -74,7 +74,6 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>> {
 	 * @return The set of all principal type unifiers
 	 */
 	protected Set<Set<UnifyPair>> unify(Set<UnifyPair> eq, IFiniteClosure fc, boolean parallel) {
-		System.out.println(eq);
 		/*
 		 * Step 1: Repeated application of reduce, adapt, erase, swap 
 		 */
@@ -153,7 +152,6 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>> {
 		Set<Set<Set<UnifyPair>>> eqPrimeSet = setOps.cartesianProduct(topLevelSets)
 				.stream().map(x -> new HashSet<>(x))
 				.collect(Collectors.toCollection(HashSet::new));
-		//System.out.println(result);
 
 		Set<Set<UnifyPair>> eqPrimePrimeSet = new HashSet<>();
 		
@@ -162,14 +160,11 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>> {
 			// Flatten the cartesian product
 			Set<UnifyPair> eqPrime = new HashSet<>();
 			setToFlatten.stream().forEach(x -> eqPrime.addAll(x));
-			System.out.println(eqPrime);
 
 			/*
 			 * Step 5: Substitution
 			 */
 			Optional<Set<UnifyPair>> eqPrimePrime = rules.subst(eqPrime);
-			System.out.println(eq);
-			System.out.println(eqPrimePrime);
 			
 			/*
 			 * Step 6 a) Restart (fork) for pairs where subst was applied
@@ -450,7 +445,7 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>> {
 		Set<UnifyType> cs = fc.getAllTypesByName(thetaPrime.getName());
 		cs.add(thetaPrime);
 		
-		for(UnifyType c : cs) {
+		for(UnifyType c : cs) {
 			Set<UnifyType> thetaQs = fc.getChildren(c).stream().collect(Collectors.toCollection(HashSet::new));
 		    thetaQs.add(thetaPrime); //PL 2017-10-03: War auskommentiert habe ich wieder einkommentiert, 
 		                             //da children offensichtlich ein echtes kleiner und kein kleinergleich ist
diff --git a/test/javFiles/fc.jav b/test/javFiles/fc.jav
new file mode 100644
index 00000000..cb8c1799
--- /dev/null
+++ b/test/javFiles/fc.jav
@@ -0,0 +1,17 @@
+import java.util.*;
+
+class Test{
+ methode(param1, param2, param3) {
+    return param1.meth(param2.add(param3));
+ }
+}
+
+interface Klasse1{
+    Klasse1 meth(Klasse1 p);
+    Klasse1 meth(Klasse2 p);
+}
+
+interface Klasse2{
+    Klasse1 meth(Klasse1 p);
+    Klasse2 meth(Klasse2 p);
+}
\ No newline at end of file
diff --git a/test/javFiles/test.jav b/test/javFiles/test.jav
index b539c15d..303d167a 100644
--- a/test/javFiles/test.jav
+++ b/test/javFiles/test.jav
@@ -10,6 +10,6 @@ interface Klasse1{
 }
 
 interface Klasse2{
-    Klasse1 meth(Klasse1 p):
-    Klasse2 meth(Klasse2 p):
+    Klasse1 meth(Klasse1 p);
+    Klasse2 meth(Klasse2 p);
 }
\ No newline at end of file
diff --git a/test/typeinference/FiniteClosureTest.java b/test/typeinference/FiniteClosureTest.java
new file mode 100644
index 00000000..d3e1fdb0
--- /dev/null
+++ b/test/typeinference/FiniteClosureTest.java
@@ -0,0 +1,9 @@
+package typeinference;
+
+import java.io.File;
+
+public class FiniteClosureTest extends JavaTXCompilerTest{
+    public FiniteClosureTest() {
+        this.fileToTest = new File(rootDirectory+"fc.jav");
+    }
+}
\ No newline at end of file