diff --git a/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java b/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java
index b84c9441..6bf4b50b 100644
--- a/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java
+++ b/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java
@@ -278,7 +278,7 @@ public class JavaTXCompiler {
 	}
 	*/
     
-    public UnifyResultModel typeInferenceAsync(UnifyResultListener resultListener) throws ClassNotFoundException {
+    public UnifyResultModel typeInferenceAsync(UnifyResultListener resultListener, Writer logFile) throws ClassNotFoundException {
     	List<ClassOrInterface> allClasses = new ArrayList<>();//environment.getAllAvailableClasses();
         //Alle Importierten Klassen in allen geparsten Sourcefiles kommen ins FC
         for(SourceFile sf : this.sourceFiles.values()) {
@@ -291,9 +291,8 @@ public class JavaTXCompiler {
         UnifyResultModel urm = new UnifyResultModel();
         urm.addUnifyResultListener(resultListener);
         try {
-			Writer logFile = new OutputStreamWriter(new NullOutputStream());
-					//new FileWriter(new File("log_"+sourceFiles.keySet().iterator().next().getName()));
-			
+        	logFile = logFile == null ? new FileWriter(new File("log_"+sourceFiles.keySet().iterator().next().getName())) : logFile;
+
 			IFiniteClosure finiteClosure = UnifyTypeFactory.generateFC(allClasses,logFile);
 			System.out.println(finiteClosure);
 			ConstraintSet<UnifyPair> unifyCons = UnifyTypeFactory.convert(cons);