Bug 46394 RCP: Add marker action disabled for Java editor
N20031111 Start fresh workspace and create a class in a Java project. The following actions are disabled: Edit > Add Bookmark... Edit > Add Task... It works in the standard text editor.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
return;
		
		IDocument document= getSourceViewer().getDocument();
			if (document == null)
				return;
				
		OccurrencesFinder finder= new OccurrencesFinder(++fComputeCount, document, (ITextSelection) getSelectionProvider().getSelection());
		Thread thread= new Thread(finder, "Occurrences Marker"); 
		thread.setDaemon(true);
		thread.start();
	}
	
	void removeOccurrenceAnnotations() {
		IDocumentProvider documentProvider= getDocumentProvider();
		if (documentProvider == null)
			return;
		
		IAnnotationModel annotationModel= documentProvider.getAnnotationModel(getEditorInput());
		if (annotationModel == null || fOccurrenceAnnotations == null)
			return;
		synchronized (annotationModel) {
			if (annotationModel instanceof IAnnotationModelExtension) {
				((IAnnotationModelExtension)annotationModel).replaceAnnotations(fOccurrenceAnnotations, null);
			} else {
				for (int i= 0, length= fOccurrenceAnnotations.length; i < length; i++)
					annotationModel.removeAnnotation(fOccurrenceAnnotations[i]);
			}
			fOccurrenceAnnotations= null;
		}
	}