actorSelection-example

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scala> import akka.actor._
import akka.actor._

scala> val system = ActorSystem("hoge")
system: akka.actor.ActorSystem = akka://hoge

scala> class PrintActor extends Actor{ def receive = { case msg => println(msg) } }
defined class PrintActor

scala> val a = system.actorOf(Props[PrintActor],"aaa")
a: akka.actor.ActorRef = Actor[akka://hoge/user/aaa#-545562946]

scala> import scala.concurrent.duration._
import scala.concurrent.duration._

scala> scala.concurrent.Await.result(system.actorSelection("/user/aaa").resolveOne()(akka.util.Timeout.intToTimeout(1000)), 10.seconds)
res0: akka.actor.ActorRef = Actor[akka://hoge/user/aaa#-545562946]

scala> scala.concurrent.Await.result(system.actorSelection("/user/aa*").resolveOne()(akka.util.Timeout.intToTimeout(1000)), 10.seconds)
res1: akka.actor.ActorRef = Actor[akka://hoge/user/aaa#-545562946]

scala> scala.concurrent.Await.result(system.actorSelection("/user/aa").resolveOne()(akka.util.Timeout.intToTimeout(1000)), 10.seconds)
akka.actor.ActorNotFound: Actor not found for: ActorSelection[Anchor(akka://hoge/), Path(/user/aa)]
  at akka.actor.ActorSelection$$anonfun$resolveOne$1.apply(ActorSelection.scala:65)
  at akka.actor.ActorSelection$$anonfun$resolveOne$1.apply(ActorSelection.scala:63)
  at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
  at akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.processBatch$1(BatchingExecutor.scala:67)
  at akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:82)
  at akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply(BatchingExecutor.scala:59)
  at akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply(BatchingExecutor.scala:59)
  at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72)
  at akka.dispatch.BatchingExecutor$Batch.run(BatchingExecutor.scala:58)
  at akka.dispatch.ExecutionContexts$sameThreadExecutionContext$.unbatchedExecute(Future.scala:74)
  at akka.dispatch.BatchingExecutor$class.execute(BatchingExecutor.scala:110)
  at akka.dispatch.ExecutionContexts$sameThreadExecutionContext$.execute(Future.scala:73)
  at scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:40)
  at scala.concurrent.impl.Promise$DefaultPromise.scala$concurrent$impl$Promise$DefaultPromise$$dispatchOrAddCallback(Promise.scala:280)
  at scala.concurrent.impl.Promise$DefaultPromise.onComplete(Promise.scala:270)
  at akka.actor.ActorSelection.resolveOne(ActorSelection.scala:63)
  ... 33 elided

scala> scala.concurrent.Await.result(system.actorSelection("/user/bb").resolveOne()(akka.util.Timeout.intToTimeout(1000)), 10.seconds)
akka.actor.ActorNotFound: Actor not found for: ActorSelection[Anchor(akka://hoge/), Path(/user/bb)]
  at akka.actor.ActorSelection$$anonfun$resolveOne$1.apply(ActorSelection.scala:65)
  at akka.actor.ActorSelection$$anonfun$resolveOne$1.apply(ActorSelection.scala:63)
  at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
  at akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.processBatch$1(BatchingExecutor.scala:67)
  at akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:82)
  at akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply(BatchingExecutor.scala:59)
  at akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply(BatchingExecutor.scala:59)
  at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72)
  at akka.dispatch.BatchingExecutor$Batch.run(BatchingExecutor.scala:58)
  at akka.dispatch.ExecutionContexts$sameThreadExecutionContext$.unbatchedExecute(Future.scala:74)
  at akka.dispatch.BatchingExecutor$class.execute(BatchingExecutor.scala:110)
  at akka.dispatch.ExecutionContexts$sameThreadExecutionContext$.execute(Future.scala:73)
  at scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:40)
  at scala.concurrent.impl.Promise$DefaultPromise.scala$concurrent$impl$Promise$DefaultPromise$$dispatchOrAddCallback(Promise.scala:280)
  at scala.concurrent.impl.Promise$DefaultPromise.onComplete(Promise.scala:270)
  at akka.actor.ActorSelection.resolveOne(ActorSelection.scala:63)
  ... 33 elided