Question

In Play, it seems that if an exception is thrown inside a Job<T>, the exception does not propagate outward.

If I understand correctly, in order to know if the inner code throws an exception, I must revert to using boolean return values (a known anti pattern)? Or am I missing something?

Here is a code sample that does not throw anything, but rather renders the todo page – and I would like to know how to know the inner job threw an exception from the outer controller method:

public static void testException() throws ExecutionException, InterruptedException {
    F.Promise<Void> result = new Job<Void>() {
        @Override
        public void doJob() throws Exception {
            Thread.sleep(1000);
            throw new RuntimeException("Foo");
        }
    }.now();
    await(result);
    result.get();
    todo();
}

Answer 1

I’m just using a Job<Boolean> instead and returning true on success.