How print all actors in akka system?

Question

I have created akka system. Suppose there are some actors in it. How I can print all actors from akka system with their path? (for debug purposes)

Answer 1

This reply by Roland Kuhn suggests that this isn't a completely trivial problem, but you can get pretty close (for actors that will reply to messages in a reasonable time) using the Identify-ActorIdentity request-response protocol that all actors obey.

Some untested code thrown together to illustrate the idea:

import akka.actor._

def receive = {
    case 'listActors =>
      context.actorSelection("/user/*") ! Identify()

    case path: ActorPath =>
      context.actorSelection(path / "*") ! Identify()

    case ActorIdentity(_, Some(ref)) =>
      log.info("Got actor " + ref.path.toString)
      self ! ref.path
}