[akka-user] Unable to listen to dead letters (have sample code)

[Sean Shubin]

As far as I can tell from the documentation, this is the proper way to 
listen for dead letters.  Can anyone tell me why the "dead letter" event 
seems to be ignored with this code?  All it does is print the number 12345, 
but I would expect it to also print the fact that it got a dead letter.  My 
versions are:
            <dependency>
                <groupId>org.scala-lang</groupId>
                <artifactId>scala-library</artifactId>
                <version>2.11.2</version>
            </dependency>
            <dependency>
                <groupId>com.typesafe.akka</groupId>
                <artifactId>akka-actor_2.11</artifactId>
                <version>2.3.6</version>
            </dependency>



import akka.actor.{ActorSystem, Actor, DeadLetter, Props}

object DeadLetterApp extends App {
  class Listener extends Actor {
    def receive = {
      case d: DeadLetter => println(s"got dead letter $d")
      case null => println("expected a dead letter, but got <null>")
      case x => println(s"expected a dead letter, but got $x of type 
${x.getClass.getName}")
    }
  }

  class MyActor(readyToStop: => Unit) extends Actor {
    override def receive: Receive = {
      case x:Int => println(x)
      case 'stop => readyToStop
    }
  }

  val system = ActorSystem()

  val listener = system.actorOf(Props(classOf[Listener]))
  val myActor = system.actorOf(Props(classOf[MyActor], system.shutdown _))

  system.eventStream.subscribe(listener, classOf[DeadLetter])

  myActor ! 12345
  myActor ! "dead letter"
  myActor ! 'stop
}

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