Actor as Singleton and Application not started error

[Sergey Dashko]

I created module to use my actor as singleton:

class ActorsModule extends AbstractModule with AkkaGuiceSupport {

  def configure() = {

    bind(classOf[MessageInit]).asEagerSingleton()

    bind(classOf[Actors]).asEagerSingleton()

    @Provides

    @Named("manager-actor")

    def managerActor(actors: Actors): ActorRef = actors.manager

  }

}

@Singleton

class Actors @Inject() (system: ActorSystem) {

  val manager = system.actorOf(ManagerActor.props)

}

@Singleton

class MessageInit @Inject()(actorSystem: ActorSystem,

                            @Named("manager-actor") managerActor: ActorRef) {

  println("Starting messages...")

  managerActor ! "start"

}

Now whenever application start I've got error "

akka.actor.OneForOneStrategy - There is no started application

akka.actor.ActorInitializationException: exception during creation

Caused by: java.lang.RuntimeException: There is no started application

"

What is wrong with my code? I need help.

Regards,

Sergey

[Sergey Dashko]

Ok, seams I have found the cause. It's because of usage play.api.Play.current.configuration in Actor.

How it is possible to fix this?

Regards,

Sergey

четверг, 12 ноября 2015 г., 5:13:37 UTC+2 пользователь Sergey Dashko написал:

[Anand Krishnan]

Hi Sergey

Did you get a work around for this issue? If so can you pls share it?

Thank you

Anand

[Greg Methvin]

The solution is not to use Play.current. Eager singletons are eagerly instantiated, meaning the component will be initialized before the app is necessarily initialized, so the global static reference the the application won't be set. Inject the configuration using DI, or manually pass it to the constructor of your actor. (See the documentation for some examples.)

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Greg Methvin

Senior Software Engineer

Lightbend, Inc.