Bug 21047 code formatter availability inconsistent
Sometimes the hotkey (ctrl-shift-f) and the menu entry for formatting the source code are disabled, while the entry in the context menu is enabled and works as expected. I didn't find any patterns on when this occurs till now.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitEditor.java
preferences.removePropertyChangeListener(fPropertyChangeListener);
			fPropertyChangeListener= null;
		}
		
		if (fJavaEditorErrorTickUpdater != null) {
			fJavaEditorErrorTickUpdater.dispose();
			fJavaEditorErrorTickUpdater= null;
		}
		
		if (fSelectionHistory != null)
			fSelectionHistory.dispose();
		
		if (fPaintManager != null) {
			fPaintManager.dispose();
			fPaintManager= null;
		}
		
		if (fActionGroups != null)
			fActionGroups.dispose();		
		
		super.dispose();
	}
	
	/*
	 * @see AbstractTextEditor#createPartControl(Composite)
	 */
	public void createPartControl(Composite parent) {
		
		super.createPartControl(parent);