CODEWITHSUNDEEP
javamultithreadingexceptionexecutorservice
Tanvi Jaywant
Tanvi Jaywant

Reputation: 415

Will exceptions be caught in following tasks?

try {
    for (final Future<Boolean> bool : threadPool.invokeAll(tasks)) {
        if (!bool.get()) {
            return false;
        }
    }
    return true;
} finally {
    threadPool.shutdownNow();
    threadPool.awaitTermination(
        IMPORT_THREADS_AWAIT_TERMINATION_TIMEOUT.toMillis(), TimeUnit.MILLISECONDS);
}

Assume the task can throw an exception. Say there are 5 tasks, and the 5th task throws an exception, but the 1st task in the loop returns false. ( and loop breaks). If that task throws an exception, I want to catch it and do some cleanup logic. I am wondering my logic will never capture exception thrown by task 5 since i break from the loop on task 1

  1. In such a case, will we ever encounter exception thrown by task 5 ?

  2. Show threadPool.shutdownNow() throw the exception of task 5 ?

Upvotes: 2

Views: 52

Answers (1)

xingbin
xingbin

Reputation: 28269

The exception will be thrown by task5, but the executor will catch it and wrap it as ExecutionException.

In this case, unless you call futureOfTask5.get(), the exception will not be re-thrown.

You can add try...catch block in the call method of task5 to log it.

Upvotes: 3

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