akkaissue.scala

import akka.actor.SupervisorStrategy.Restart
import akka.actor.{Actor, ActorInitializationException, ActorSystem, OneForOneStrategy, Props}

object Main extends App {
  var attempt: Int = 0

  class FailingActor extends Actor {

    if (attempt == 0) {
      // throw exception only for the first time, simulating first attempt to create an actor that fails
      attempt = 1
      throw new RuntimeException("failed to create an instance")
    }

    override def receive: Receive = {
      case _ =>
    }

    override def preStart(): Unit = {
      // Same behavior when error happens in 'preRestart'
      // throw new RuntimeException("failed to create an instance")
    }

  }

  class TestSuperVisor extends Actor {

    context.actorOf(Props(classOf[FailingActor]))

    override def receive: Receive = {
      case _ =>
    }

    override val supervisorStrategy = OneForOneStrategy(loggingEnabled = false) {
      case _: ActorInitializationException =>
        Restart
    }
  }

  private implicit lazy val system: ActorSystem = ActorSystem("test")

  system.actorOf(Props(classOf[TestSuperVisor]))

  Thread.sleep(1000)

  system.terminate()

  /*
  This is unexpected error that gets logged:
  [ERROR] [11/19/2017 13:52:02.095] [test-akka.actor.default-dispatcher-3] [akka://test/user/$a/$a] a.a.ActorCell changing Recreate into Create after akka.actor.ActorInitializationException: akka://test/user/$a/$a: exception during creation
   */

}