Exception during Callable execution

Question

I have the following Callable:

public class Worker implements Callable<Boolean>{

   @Override
   public Boolean call(){
      boolean success=true;

      //do Something
     return success;
   }

}

Now I'm executing it:

Worker worker - new Worker();
Future<Boolean> submit = executor.submit(worker);

I'm storing the submit in kind of hashMap for some operation to be performed somewhere in code.

How can I know if any exception has occured in worker.call() function?

Will submit.isCancelled() return true if some sort of Exception occurred and false if everything works ok?

Answer 1

When you call Future.get() it will throw your exception wrapped in a ExecutionException.

Answer 2

As stated in the documentation, Future<V> will re-throw the exception that occurred during .call() (though wrapped in an ExecutionException), and isCancelled() would still be false in this case.

Answer 3

In Guava Librairies, there is a FutureCallback interface which has a onFailure(Throwable t) method which should interest you

Adding Google Guava Librairies to a project is never a waste of space :-)

Answer 4

submit.get() will throw an ExecutionException