withFallback(ConfigFactory.parseString("akka.cluster.roles = [frontend]")).
withFallback(ConfigFactory.load());
ActorSystem system = ActorSystem.create("ClusterSystem", config);
final ActorRef frontend = system.actorOf(
Props.create(TransformationFrontend.class), "frontend");
final FiniteDuration interval = Duration.create(2, TimeUnit.SECONDS);
final Timeout timeout = new Timeout(Duration.create(5, TimeUnit.SECONDS));
final ExecutionContext ec = system.dispatcher();
final AtomicInteger counter = new AtomicInteger();