Akka + remote Actor => println not working ?

PongAkka.scala and others

// application.conf
server {
  akka {
    actor {
      provider = "akka.remote.RemoteActorRefProvider"
    }
    remote {
      transport = "akka.remote.netty.NettyRemoteTransport"
      netty {
        hostname = "127.0.0.1"
        port = 2552
      }
    }
  }
}

client {
  akka {
    actor {
      provider = "akka.remote.RemoteActorRefProvider"
    }
    remote {
      transport = "akka.remote.netty.NettyRemoteTransport"
      netty {
        hostname = "127.0.0.1"
        port = 2553
      }
    }
  }
}


// PongAkka.scala
package ca.gsimard.client.akka

import com.typesafe.config.ConfigFactory
import akka.actor.Actor
import akka.actor.ActorRef
import akka.actor.ActorSystem
import akka.actor.Props


case class Greeting(g: String)

class PongAkka extends Actor {
  
  def receive = {
   	case Greeting(g) ⇒
   	  println("Server: " + g)
   	  sender ! Greeting("greetings from server.")
   	case _ ⇒ println("Server: received unknown message")
  }
  
}

class PingAkka extends Actor {

  var greeter: ActorRef = null

  def receive = {
    case "Connect" => 
      greeter = context.actorFor("akka://Server@127.0.0.1:2552/soundServer");
      println("Client: Connected")
    case "Send" => greeter ! Greeting("hello")
   	case Greeting(g) ⇒ println("Client: " + g)
   	case _ ⇒ println("Client: received unknown message")
  }
  
}


// main.scala
package ca.gsimard.client

import _root_.akka.actor.ActorSystem
import _root_.akka.actor.Props
import com.typesafe.config.ConfigFactory

object Main {

  def main(args: Array[String]): Unit = {
    val config1 = ConfigFactory.load("resources/application.conf")
    val app1 = ActorSystem("Server", config1.getConfig("server").withFallback(config1))
    val server = app1.actorOf(Props[akka.PongAkka], name = "soundServer")

    val config2 = ConfigFactory.load("resources/application.conf")
    val app2 = ActorSystem("Client", config2.getConfig("client").withFallback(config2))
    val client = app2.actorOf(Props[akka.PingAkka], name = "soundClient")

    client ! "Connect"
    Thread.sleep(2000)
    client ! "Send"
    
    Thread.sleep(5000)
    
    app1.shutdown()
    app2.shutdown()
    
    return
  }

}


// Result:

[INFO] [03/13/2012 15:24:22.550] [main] [ActorSystem(SpacecraftServer)] REMOTE: RemoteServerStarted@akka://SpacecraftServer@127.0.0.1:2552
[INFO] [03/13/2012 15:24:22.680] [main] [ActorSystem(SpacecraftClient)] REMOTE: RemoteServerStarted@akka://SpacecraftClient@127.0.0.1:2553

Client: Connected

[INFO] [03/13/2012 15:24:24.826] [SpacecraftClient-akka.actor.default-dispatcher-5] [ActorSystem(SpacecraftClient)] REMOTE: RemoteClientStarted@akka://SpacecraftServer@127.0.0.1:2552
[INFO] [03/13/2012 15:24:24.852] [SpacecraftServer-6] [ActorSystem(SpacecraftServer)] REMOTE: RemoteClientStarted@akka://SpacecraftClient@127.0.0.1:2553
[INFO] [03/13/2012 15:24:29.756] [SpacecraftClient-akka.actor.default-dispatcher-3] [ActorSystem(SpacecraftClient)] REMOTE: RemoteClientShutdown@akka://SpacecraftServer@127.0.0.1:2552
[INFO] [03/13/2012 15:24:29.756] [SpacecraftServer-akka.actor.default-dispatcher-1] [ActorSystem(SpacecraftServer)] REMOTE: RemoteClientShutdown@akka://SpacecraftClient@127.0.0.1:2553
[INFO] [03/13/2012 15:24:29.769] [SpacecraftClient-akka.actor.default-dispatcher-3] [ActorSystem(SpacecraftClient)] REMOTE: RemoteServerShutdown@akka://SpacecraftClient@127.0.0.1:2553
[INFO] [03/13/2012 15:24:29.769] [SpacecraftServer-akka.actor.default-dispatcher-1] [ActorSystem(SpacecraftServer)] REMOTE: RemoteServerShutdown@akka://SpacecraftServer@127.0.0.1:2552