Graceful Stop example in akkka

GracefulStop.java

long timeout = 5L;

        try {
            // https://petabridge.com/blog/how-to-stop-an-actor-akkadotnet/
            // http://doc.akka.io/docs/akka/current/java/actors.html - "Graceful Stop"
            //
            // I don't specify stopMessage as by default it's PoisonPill, I want the processing of messages to be finished
            // by the target actor.
            CompletionStage<Boolean> stopped = gracefulStop(queueActor, Duration.create(5, TimeUnit.SECONDS));
            stopped.toCompletableFuture().get(timeout + 1, TimeUnit.SECONDS);
        } catch (AskTimeoutException e) {
            log.warning("shutdownQueue - the actor for queue {} wasn't stopped within {} seconds", queueName, timeout);
        } catch (TimeoutException e) {
            log.warning("shutdownQueue - gracefulStop for queue {} was unsuccessful. This shouldn't even happen.", queueName);
        } catch (ExecutionException e) {
            throw new QueueShutdownFailedException(queueName, e.getCause());
        }