diff --git a/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java b/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java
index d096935c..a77ff228 100644
--- a/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java
+++ b/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java
@@ -70,7 +70,7 @@ public class JavaTXCompiler {
     public volatile UnifyTaskModel usedTasks = new UnifyTaskModel();
     public final DirectoryClassLoader classLoader;
 
-	private final List<File> classPath;
+	public final List<File> classPath;
 	private final File outputPath;
 
 	public DirectoryClassLoader getClassLoader() {
@@ -670,9 +670,10 @@ public class JavaTXCompiler {
 		environment.addClassesToRegistry(classRegistry, tree, sourceFile, this);
 		SyntaxTreeGenerator generator = new SyntaxTreeGenerator(this, classRegistry, new GenericsRegistry(null), sourceFile.getName());
 		var classes = new ArrayList<ClassOrInterface>();
-		var sf = new SourceFile(generator.pkgName, classes, generator.imports);
+		var sf = new SourceFile("", classes, generator.imports);
 		addSourceFile(sourceFile, sf);
 		generator.convert(classes, tree, environment.packageCrawler);
+		sf.setPackageName(generator.pkgName);
 		sf.imports.addAll(generator.imports);
 		return sf;
 	}
@@ -692,20 +693,17 @@ public class JavaTXCompiler {
 				environment.addClassesToRegistry(classRegistry, tree, file, this);
 				SyntaxTreeGenerator generator = new SyntaxTreeGenerator(this, classRegistry, new GenericsRegistry(null), file.getName());
 				var classes = new ArrayList<ClassOrInterface>();
-				var sf = new SourceFile(generator.pkgName, classes, generator.imports);
+				var sf = new SourceFile("", classes, generator.imports);
 				addSourceFile(file, sf);
 				generator.convert(classes, tree, environment.packageCrawler);
+				sf.setPackageName(generator.pkgName);
 				var classFiles = generateBytecode(file);
 
-				File path = outputPath;
-				if (outputPath == null) {
-					path = file.getParentFile(); // Set path to path of the parsed .jav file
-				}
-
-				writeClassFile(classFiles, path, outputPath == null);
+				sf.setGenerated();
+				writeClassFile(classFiles, outputPath != null ? outputPath : new File("."), false);
 				var clazz = classLoader.loadClass(name.toString());
 				var classOrInterface = ASTFactory.createClass(clazz);
-				loadedClasses.put(name, new ClassEntry(new File(path, clazz.getName() + ".class"), classOrInterface));
+				loadedClasses.put(name, new ClassEntry(new File(outputPath, clazz.getName() + ".class"), classOrInterface));
 				return classOrInterface;
 			} catch (Exception e) {
 				throw new RuntimeException(e);
@@ -726,8 +724,11 @@ public class JavaTXCompiler {
 
 	public void generateBytecode() throws ClassNotFoundException, IOException {
 		for (var file : sourceFiles.keySet()) {
+			var sf = sourceFiles.get(file);
+			if (sf.isGenerated()) continue;
 			var classes = generateBytecode(file);
-			writeClassFile(classes, outputPath, outputPath == null);
+			sf.setGenerated();
+			writeClassFile(classes, outputPath == null ? file.getParentFile() : outputPath, outputPath == null);
 		}
 	}
 
@@ -736,8 +737,10 @@ public class JavaTXCompiler {
 	 * @return
 	 */
 	public Map<JavaClassName, byte[]> generateBytecode(File sourceFile) throws ClassNotFoundException, IOException {
+		var sf = sourceFiles.get(sourceFile);
+		if (sf.isGenerated()) return null;
 		List<ResultSet> typeinferenceResult = this.typeInference(sourceFile);
-		return generateBytecode(sourceFiles.get(sourceFile), typeinferenceResult);
+		return generateBytecode(sf, typeinferenceResult);
 	}
 
 	private Map<SourceFile, List<GenericsResult>> generatedGenerics = new HashMap<>();
@@ -788,6 +791,7 @@ public class JavaTXCompiler {
 			var subPath = preserveHierarchy ? path : Path.of(path.toString(), name.getPackageName().split("\\.")).toFile();
 			File outputFile = new File(subPath, name.getClassName() + ".class");
 			outputFile.getAbsoluteFile().getParentFile().mkdirs();
+			System.out.println(outputFile);
 			output = new FileOutputStream(outputFile);
 			output.write(bytecode);
 			output.close();
diff --git a/src/main/java/de/dhbwstuttgart/environment/CompilationEnvironment.java b/src/main/java/de/dhbwstuttgart/environment/CompilationEnvironment.java
index 0e2a4534..4b802fe5 100644
--- a/src/main/java/de/dhbwstuttgart/environment/CompilationEnvironment.java
+++ b/src/main/java/de/dhbwstuttgart/environment/CompilationEnvironment.java
@@ -77,7 +77,7 @@ public class CompilationEnvironment {
 		// Set classLoader to include default package for this specific source file
 		File dir = sourceFile.getAbsoluteFile().getParentFile();
 		String dirPath = dir.toString() + "/";
-		if (packageName.length() > 0)
+		if (!packageName.isEmpty())
 			dirPath = dirPath.substring(0, dirPath.length() - packageName.length() - 1);
 		String path = dirPath;
 		ArrayList<File> defaultPath = Lists.newArrayList(new File(path));
@@ -89,7 +89,10 @@ public class CompilationEnvironment {
 				String className = classFile.getName().substring(0, classFile.getName().length() - 6);
 				if (className.matches("Fun\\d+\\$\\$.*"))
 					continue;
-				ret.add(classLoader.loadClass(packageName + className));
+				var name = packageName;
+				if (!packageName.isEmpty()) name += ".";
+				name += className;
+				ret.add(classLoader.loadClass(name));
 			}
 		return ret;
 	}
diff --git a/src/main/java/de/dhbwstuttgart/syntaxtree/SourceFile.java b/src/main/java/de/dhbwstuttgart/syntaxtree/SourceFile.java
index a0a7e42e..12b77616 100644
--- a/src/main/java/de/dhbwstuttgart/syntaxtree/SourceFile.java
+++ b/src/main/java/de/dhbwstuttgart/syntaxtree/SourceFile.java
@@ -15,6 +15,8 @@ public class SourceFile extends SyntaxTreeNode {
   public final List<ClassOrInterface> KlassenVektor;
   public final Set<JavaClassName> imports;
 
+  private boolean isGenerated;
+
   public List<ClassOrInterface> availableClasses = new ArrayList<>();
 
   /**
@@ -38,6 +40,18 @@ public class SourceFile extends SyntaxTreeNode {
     this.imports = new HashSet<>(sf.imports);
   }
 
+  public void setPackageName(String packageName) {
+    this.pkgName = packageName;
+  }
+
+  public void setGenerated() {
+    this.isGenerated = true;
+  }
+
+  public boolean isGenerated() {
+    return this.isGenerated;
+  }
+
   public String getPkgName() {
     return this.pkgName;
   }