Re: Error when Actor definition is inside another Actor

[Arun Ramakrishnan]

This is the 2.0-M4

On Fri, Feb 10, 2012 at 5:43 PM, Arun Ramakrishnan <sinchron...@gmail.com> wrote:

The following snipper throws the error below. But, if I move the TAct definition to outside, then this dosent happen. Might be a nube question. But, am curious why.

**********************************************************************************

object Supervisor1 extends App {

  class Master extends Actor {

    

class TAct extends Actor {  def receive = { case a: Any => }   }

    def receive = { case _:String => context.actorOf(Props[TAct]) ! "hell" }

    

  }

  

    val system = ActorSystem("Supervisor1System")

    val master = system.actorOf(Props[Master],name = "master")

    master ! ""

}

// Results in 

/*

[ERROR] [02/10/2012 15:56:49.583] [ForkJoinPool-1-worker-1] [akka://Supervisor1System/user/master/$a] error while creating actor

java.lang.InstantiationException: ak.Supervisor1$Master$TAct

at java.lang.Class.newInstance0(Class.java:340)

at java.lang.Class.newInstance(Class.java:308)

at akka.actor.Props$$anonfun$apply$1.apply(Props.scala:46)

at akka.actor.Props$$anonfun$apply$1.apply(Props.scala:46)

at akka.actor.ActorCell.newActor(ActorCell.scala:344)

at akka.actor.ActorCell.create$1(ActorCell.scala:361)

at akka.actor.ActorCell.systemInvoke(ActorCell.scala:448)

at akka.dispatch.Mailbox.processAllSystemMessages(Mailbox.scala:194)

at akka.dispatch.Mailbox.run(Mailbox.scala:163)

at akka.dispatch.ForkJoinExecutorConfigurator$MailboxExecutionTask.exec(AbstractDispatcher.scala:448)

at akka.jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:268)

at akka.jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:929)

at akka.jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1303)

at akka.jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104)

*/

[Arun Ramakrishnan]

[Patrik Nordwall]

The reason is that Props[TAct] can not be used for inner classes. You must use Props(new TAct) for that case.

/Patrik

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