Bug 93287 LTK Core Refactoring triggered on shutdown of JavaPlugin
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/JavaPlugin.java
fWorkingCopyManager= null;
			}
			
			if (fCompilationUnitDocumentProvider != null) {
				fCompilationUnitDocumentProvider.shutdown();
				fCompilationUnitDocumentProvider= null;
			}
					
			if (fJavaTextTools != null) {
				fJavaTextTools.dispose();
				fJavaTextTools= null;
			}
			
			uninstallPreferenceStoreBackwardsCompatibility();
			
			RefactoringCore.getUndoManager().shutdown();
		} finally {	
			super.stop(context);
		}
	}
		
	private IWorkbenchPage internalGetActivePage() {
		IWorkbenchWindow window= getWorkbench().getActiveWorkbenchWindow();
		if (window == null)
			return null;
		return getWorkbench().getActiveWorkbenchWindow().getActivePage();
	}
	
	/**
	 * @deprecated