Error Message Failed To Create Instance Of Act_tar
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0 down vote favorite In an Actor I create a child actor like below ActorRef sessionEventHandlerActor = getContext().actorOf(Props.create(SessionHandler.class), sessionId); and this is SessionHandler actor: public class SessionHandler extends UntypedActor { public SessionHandler() { getContext().setReceiveTimeout(Duration.create(1, TimeUnit.MINUTES)); } @Override public void onReceive(Object message) throws Exception { } } and I get following error: Caused by: akka.actor.ActorInitializationException: You cannot create an instance of [actors.SessionHandler] explicitly using the constructor (new). You have to use one of the 'actorOf' factory methods to create a new actor. See the documentation. at akka.actor.ActorInitializationException$.apply(Actor.scala:165) at akka.actor.Actor$class.$init$(Actor.scala:421) at akka.actor.UntypedActor.
to the second cornerstone of Scala concurrency: The actor model, which complements the model based on composable futures backed by promises. You learnt how to define and create actors, how to send akka.net dependency injection messages to them and how an actor processes these messages, possibly modifying its internal state
Akka Dead Letters
as a result or asynchronously sending a response message to the sender. While that was hopefully enough to get you interested akka documentation in the actor model for concurrency, I left out some crucial concepts you will want to know about before starting to develop actor-based applications that consist of more than a simple echo actor. The actor model http://stackoverflow.com/questions/37900950/error-creating-child-actor is meant to help you achieve a high level of fault tolerance. In this article, we are going to have a look at how to deal with failure in an actor-based application, which is fundamentally different from error handling in a traditional layered server architecture. The way you deal with failure is closely linked to some core Akka concepts and to some of the elements an actor system in Akka consists http://danielwestheide.com/blog/2013/03/20/the-neophytes-guide-to-scala-part-15-dealing-with-failure-in-actor-systems.html of. Hence, this article will also serve as a guide to those ideas and components. Actor hierarchies Before going into what happens when an error occurs in one of your actors, it's essential to introduce one crucial idea underlying the actor approach to concurrency – an idea that is the very foundation for allowing you to build fault-tolerant concurrent applications: Actors are organized in a hierarchy. So what does this mean? First of all, it means that every single of your actors has got a parent actor, and that each actor can create child actors. Basically, you can think of an actor system as a pyramid of actors. Parent actors watch over their children, just as in real life, taking care that they get back on their feet if they stumble. You will see shortly how exactly this is done. The guardian actor In the previous article, we only had two different actors, a Barista actor and a Customer actor. I will not repeat their rather trivial implementations, but focus on how we created instances of these actor types: 1 2 3 4 import akka.actor.ActorSystem val system = ActorSystem("Coffeehouse") val barista = system.actorOf(Props
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