[SOLVED] Akka Remote: get autogenerated port

Akka Remote: get autogenerated port

I have a Java client, which obtains an autogenerated port. After starting the actor system, I want to access the port.

Config clientConfig = ConfigFactory.parseString("akka.remote.netty.tcp.port = 0")
        .withFallback(ConfigFactory.parseString("akka.remote.netty.tcp.hostname = " + serverHostName))
        .withFallback(ConfigFactory.load("common"));

actorSystem = ActorSystem.create("clientActorSystem", clientConfig);

// how to access the generated port here..!?

The port must already be set since the log output after ActorSystem.create(...) is like that:

[INFO] [03/31/2016 14:11:32.042] [main] [akka.remote.Remoting] Starting remoting
[INFO] [03/31/2016 14:11:32.233] [main] [akka.remote.Remoting] Remoting started; listening on addresses :[akka.tcp://actorSystem@localhost:58735]
[INFO] [03/31/2016 14:11:32.234] [main] [akka.remote.Remoting] Remoting now listens on addresses: [akka.tcp://actorSystem@localhost:58735]

If I try to get it via the configuration with actorSystem.settings().config().getValue("akka.remote.netty.tcp.port"), I still get 0 as defined before.

Has anyone an idea how this port (58735 in the example) can be accessed?

Solution

Using scala you can get Option of port on which Actor system is currently running:

val port = system.provider.getDefaultAddress.port

Hope you will be able to get the same code in Java.