I've a long-running task defined in a Spring service. It is started by a Spring MVC controller. I want to start the service and return back an HttpResponse to the caller before the service ends. The service saves a file on file system at end. In javascript I've created a polling job to check service status.

In Spring 3.2 I've found the @Async annotation, but I don't understand how it is different from DeferredResult and Callable. When do I have to use @Async and when should I use DeferredResult?

spring-mvc asynchronous deferred callable
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