Unable to create an actor using UnTypedActorFactory of akka java api

问题

I am trying to create an actor with untyped actor factory, compilation happens fine. But while running the application, I get the following error. Am I missing anything in configuration?

Java Code:

MyActor myactor = new MyActor();  //MyActor extends UnTypedActor
ActorSystem system = ActorSystem.create("mynamespace");
ActorRef actor = system.actorOf(new Props(new UntypedActorFactory() {
      public UntypedActor create() {
          return myactor;
      }
  }));

Error during runtime:

Caused by: akka.actor.ActorInitializationException: You cannot create an instance of [com.practice.MyActor] explicitly using the constructor (new). You have to use one of the factory methods to create a new actor. Either use: 'val actor = context.actorOf(Props[MyActor])'
(to create a supervised child actor from within an actor), or 'val actor = system.actorOf(Props(new MyActor(..)))' (to create a top level actor from the ActorSystem)

回答1:

That's because you are creating the instance of MyActor outside the ActorSystem. Create the Actor inside of your factory (that's what it is for ;-) ) and it should be fine.

ActorSystem system = ActorSystem.create("mynamespace");
ActorRef actor = system.actorOf(new Props(new UntypedActorFactory() {
  public UntypedActor create() {
    return new MyActor();
  }
}));

In this case you don't even need a factory, because you have a default constructor. Just pass the class as parameter to the Props:

system.actorOf(new Props(MyActor.class));

来源：https://stackoverflow.com/questions/10735716/unable-to-create-an-actor-using-untypedactorfactory-of-akka-java-api