Question

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Handling exceptions from Java ExecutorService tasks

I use the ExecutorService from Java for coordinating Threads.
For starting the threads I use

pool = new ExecutorService(2);
callableResults = pool.invokeAll(threads);

To collect the result, I use future.get() for each thread.
“threads” is a List of Objects from a Class which implements Callable and overrides call().

Now Ive got the following problem. The method call() does throw various specific exceptions. invokeAll() and future.get() throw only InterruptedException.

Where can I catch my specific exceptions which I throw in call()? Or do I have to handle them there? If one of those exceptions is thrown, is the result then a InterruptedException?

Answer 1

AFAIR java.util.concurrent.Future.get() will throw ExecutionException if provided callable threw exception in the past (the exception is stored in the Future).

Exception thrown when attempting to retrieve the result of a task that aborted by throwing an exception. This exception can be inspected using the Throwable.getCause() method.