Scala API

// server code
class HelloWorldActor extends Actor {
  def receive = {
    case msg => self reply (msg + " World")
  }
}
remote.start("localhost", 2552).register(
  "hello-service", actorOf[HelloWorldActor])

// client code
val actor = remote.actorFor(
  "hello-service", "localhost", 2552)
val result = (actor ? "Hello").as[String]

Java API

// server code
class HelloWorldActor extends UntypedActor {
  public void onReceive(Object msg) {
    getContext().tryReply(msg + " World");
  }
}
remote().start("localhost", 2552).register(
  "hello-service",
   actorOf(HelloWorldActor.class));

// client code
ActorRef actor = remote().actorFor(
  "hello-service", "localhost", 2552);
Object res = actor.ask("Hello").get();
That's it. Can't be much simpler.