diff --git a/src/main/java/de/dhbwstuttgart/bytecode/BytecodeGen.java b/src/main/java/de/dhbwstuttgart/bytecode/BytecodeGen.java
index f901036f..e721fd9f 100644
--- a/src/main/java/de/dhbwstuttgart/bytecode/BytecodeGen.java
+++ b/src/main/java/de/dhbwstuttgart/bytecode/BytecodeGen.java
@@ -17,6 +17,7 @@ import org.objectweb.asm.MethodVisitor;
 import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.Type;
 
+import de.dhbwstuttgart.bytecode.Exception.BytecodeGeneratorError;
 import de.dhbwstuttgart.bytecode.constraint.ExtendsConstraint;
 import de.dhbwstuttgart.bytecode.constraint.TPHConstraint;
 import de.dhbwstuttgart.bytecode.constraint.TPHConstraint.Relation;
@@ -506,7 +507,7 @@ public class BytecodeGen implements ASTVisitor {
 		String nameAndDesc = field.getName() + "%%" + des;
 		
 		if(fieldNameAndParamsT.contains(nameAndDesc))
-			return;
+			throw new BytecodeGeneratorError("Bytecode generation aborted due to duplicate field name&signature");
 		
 		fieldNameAndParamsT.add(nameAndDesc);
 		
diff --git a/src/main/java/de/dhbwstuttgart/bytecode/BytecodeGenMethod.java b/src/main/java/de/dhbwstuttgart/bytecode/BytecodeGenMethod.java
index 69bb9250..f047e251 100644
--- a/src/main/java/de/dhbwstuttgart/bytecode/BytecodeGenMethod.java
+++ b/src/main/java/de/dhbwstuttgart/bytecode/BytecodeGenMethod.java
@@ -781,32 +781,23 @@ public class BytecodeGenMethod implements StatementVisitor {
 		MethodCallHelper helper = new MethodCallHelper(methodCall, sf, resultSet);
 		
 		boolean isCreated = false;
-//		if(!receiverName.equals(className)) {
-			ClassLoader cLoader = ClassLoader.getSystemClassLoader();
-			// This will be used if the class is not standard class (not in API)
-			ClassLoader cLoader2;
-			
-			String methCallType = resultSet.resolveType(methodCall.getType()).resolvedType.acceptTV(new TypeToDescriptor());
-			String[] typesOfParams = getTypes(methodCall.arglist.getArguments());
-			try {
-				if(receiverName.contains("<")) {
-					clazz = clazz.substring(0, receiverName.indexOf("<"));
-				}
-				
-				java.lang.reflect.Method[] methods = cLoader.loadClass(clazz).getMethods();
-				System.out.println("Methods of " + receiverName + " ");
-				methodRefl = getMethod(methodCall.name,methodCall.arglist.getArguments().size(),methods);
-				
+
+		ClassLoader cLoader = ClassLoader.getSystemClassLoader();
+		// This will be used if the class is not standard class (not in API)
+		ClassLoader cLoader2;
+
+		String methCallType = resultSet.resolveType(methodCall.getType()).resolvedType.acceptTV(new TypeToDescriptor());
+		String[] typesOfParams = getTypes(methodCall.arglist.getArguments());
+		try {
+			if (receiverName.contains("<")) {
+				clazz = clazz.substring(0, receiverName.indexOf("<"));
+			}
+
+			java.lang.reflect.Method[] methods = cLoader.loadClass(clazz).getMethods();
+			System.out.println("Methods of " + receiverName + " ");
+			methodRefl = getMethod(methodCall.name, methodCall.arglist.getArguments().size(), methods);
+
 			} catch (Exception e) {
-//				try {
-//					cLoader2 = new URLClassLoader(new URL[] {new URL("file://"+path)});
-//					java.lang.reflect.Method[] methods = cLoader2.loadClass(clazz).getMethods();
-//					System.out.println("Methods of " + receiverName + " ");
-//					for(int i = 0; i<methods.length; i++) {
-//						System.out.println(methods[i]);
-//					}
-//					methodRefl = getMethod(methodCall.name,methodCall.arglist.getArguments().size(),methCallType, typesOfParams,methods);
-//				}catch (Exception e2) {
 					String superClass = "";
 					// TODO: Test SubMatrix.jav
 					while(true) {
@@ -838,7 +829,6 @@ public class BytecodeGenMethod implements StatementVisitor {
 						}
 						
 					}
-//				}
 				
 			}
 			
@@ -866,7 +856,6 @@ public class BytecodeGenMethod implements StatementVisitor {
 				}
 				
 			}
-//		}
 		
 		methodCall.receiver.accept(this);
 		
diff --git a/src/main/java/de/dhbwstuttgart/bytecode/Exception/BytecodeGeneratorError.java b/src/main/java/de/dhbwstuttgart/bytecode/Exception/BytecodeGeneratorError.java
new file mode 100644
index 00000000..7d26f66f
--- /dev/null
+++ b/src/main/java/de/dhbwstuttgart/bytecode/Exception/BytecodeGeneratorError.java
@@ -0,0 +1,19 @@
+/**
+ * 
+ */
+package de.dhbwstuttgart.bytecode.Exception;
+
+/**
+ * @author fayez
+ *
+ */
+public class BytecodeGeneratorError extends RuntimeException {
+
+	/**
+	 * @param message
+	 */
+	public BytecodeGeneratorError(String message) {
+		super(message);
+	}
+	
+}
diff --git a/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java b/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java
index 0d13045f..9f1d17eb 100644
--- a/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java
+++ b/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java
@@ -3,6 +3,7 @@ package de.dhbwstuttgart.core;
 
 
 import de.dhbwstuttgart.bytecode.BytecodeGen;
+import de.dhbwstuttgart.bytecode.Exception.BytecodeGeneratorError;
 import de.dhbwstuttgart.bytecode.utilities.SimplifyResult;
 import de.dhbwstuttgart.environment.CompilationEnvironment;
 import de.dhbwstuttgart.parser.JavaTXParser;
@@ -651,7 +652,7 @@ public class JavaTXCompiler {
         return ret;
     }
     // um pfad erweitern
-    public void generateBytecode(String path) throws ClassNotFoundException, IOException {
+    public void generateBytecode(String path) throws ClassNotFoundException, IOException, BytecodeGeneratorError {
     		for(File f : sourceFiles.keySet()) {
     			HashMap<String,byte[]> classFiles = new HashMap<>();
     			SourceFile sf = sourceFiles.get(f);