spring AsyncTask update jsf view component

I have a long run job must run in background and after it finished I want to update jsf view component.

I used SimpleAsyncTaskExecutor to do the work. It works good but when comming to updating ui then I am getting NullPointerException.

Here is my code

SimpleAsyncTaskExecutor tasks = new SimpleAsyncTaskExecutor(); 
tasks.submitListenable(new Callable<String>() {

    @Override
    public String call() throws Exception {
        //Do long time taking job in approximately 16 seconds
        doTheBigJob();

        //then update view component by it's id
        FacesContext.getCurrentInstance().getPartialViewContext().getRenderIds().add(myComponentId);
        return "";          
    }       
});

Not: When the time is short (like 2 seconds), no NullPointerException occurs

Thanks in advence.