How to shutdown my eclipse job after rcp app closes

Question

I'm using eclipse ui jobs to perform an asynchronous operation. For this when the job is still running and close my rcp app, I get a message on the console saying, !ENTRY org.eclipse.core.jobs !MESSAGE Job found still running after platform shutdown. Jobs should be canceled by the plugin that scheduled them during shutdown: com.myPluginame. I'm currently doing this

PlatformUI.getWorkbench().addWorkbenchListener(new IWorkbenchListener() {

                    @Override
                    public boolean preShutdown(IWorkbench workbench, boolean forced) {
                        return true;
                    }

                    @Override
                    public void postShutdown(IWorkbench workbench) {
                        if (myJob != null) {
                            myJob .cancel();
                        }
                    }
                });

after my workbench shuts down, myJob.cancel() code is hit but still, I see the message. Any thoughts?