diff --git a/JavaCompilerPlugin/bundles/JavaCompilerPlugin.Plugin/src/typinferenzplugin/Typinferenz.java b/JavaCompilerPlugin/bundles/JavaCompilerPlugin.Plugin/src/typinferenzplugin/Typinferenz.java
index 4db2143..e8fa978 100644
--- a/JavaCompilerPlugin/bundles/JavaCompilerPlugin.Plugin/src/typinferenzplugin/Typinferenz.java
+++ b/JavaCompilerPlugin/bundles/JavaCompilerPlugin.Plugin/src/typinferenzplugin/Typinferenz.java
@@ -173,4 +173,8 @@ public class Typinferenz {
 	public SourceFile getSourceFile() {
 		return parsedSource;
 	}
+
+	public void cancel() {
+		compiler.usedTasks.cancel();
+	}
 }
diff --git a/JavaCompilerPlugin/bundles/JavaCompilerPlugin.Plugin/src/typinferenzplugin/editor/JavEditor.java b/JavaCompilerPlugin/bundles/JavaCompilerPlugin.Plugin/src/typinferenzplugin/editor/JavEditor.java
index 443a199..8594363 100644
--- a/JavaCompilerPlugin/bundles/JavaCompilerPlugin.Plugin/src/typinferenzplugin/editor/JavEditor.java
+++ b/JavaCompilerPlugin/bundles/JavaCompilerPlugin.Plugin/src/typinferenzplugin/editor/JavEditor.java
@@ -24,6 +24,7 @@ import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.Status;
 import org.eclipse.core.runtime.jobs.Job;
 import org.eclipse.e4.ui.di.UISynchronize;
+import org.eclipse.jdt.internal.corext.refactoring.reorg.ParentChecker;
 import org.eclipse.jface.text.IDocument;
 import org.eclipse.jface.text.Position;
 import org.eclipse.jface.text.source.Annotation;
@@ -31,6 +32,8 @@ import org.eclipse.jface.text.source.IAnnotationModel;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.ui.IEditorInput;
 import org.eclipse.ui.IFileEditorInput;
+import org.eclipse.ui.IPartListener;
+import org.eclipse.ui.IWorkbenchPart;
 import org.eclipse.ui.editors.text.TextEditor;
 import org.eclipse.ui.part.FileEditorInput;
 import org.eclipse.ui.texteditor.IDocumentProvider;
@@ -89,6 +92,30 @@ public class JavEditor extends TextEditor implements UnifyResultListener {
 		// install the document provider
 		// setDocumentProvider(new HTMLDocumentProvider());
 		typeinference = new Typinferenz(this);
+		
+		getSite().getPage().addPartListener(new IPartListener() {
+			
+			@Override
+			public void partOpened(IWorkbenchPart arg0) {
+			}
+			
+			@Override
+			public void partDeactivated(IWorkbenchPart arg0) {
+			}
+			
+			@Override
+			public void partClosed(IWorkbenchPart arg0) {
+				typeinference.cancel();
+			}
+			
+			@Override
+			public void partBroughtToTop(IWorkbenchPart arg0) {
+			}
+			
+			@Override
+			public void partActivated(IWorkbenchPart arg0) {
+			}
+		});
 	}
 
 	@Override
@@ -112,6 +139,7 @@ public class JavEditor extends TextEditor implements UnifyResultListener {
 	public void doSave(IProgressMonitor monitor) {
 		super.doSave(monitor);
 		// Wird aufgerufen, sobald das Dokument gespeichert wird.
+		typeinference.cancel();
 		typeinference = new Typinferenz(this);
 		this.removeMarkers();
 		this.typeReconstruction();
@@ -231,6 +259,8 @@ public class JavEditor extends TextEditor implements UnifyResultListener {
 	 * @param typeReplaceMarker
 	 */
 	public void runReplaceMarker(TypeReplaceMarker typeReplaceMarker) {
+		typeinference.cancel();
+		
 		IDocument document = this.getDocumentProvider().getDocument(this.getEditorInput());
 		document.set(typeReplaceMarker.insertType(document.get()));