How to get application port programmatically in Dropwizard

Question

I am using dropwizard version 0.7.1. It is configured to use "random" (ephemeral?) port (server.applicationConnectors.port=0). I want to get what port is really in use after startup, but I can't find any information how to do that.

Answer 1

You can get a serverStarted callback from a lifecycle listener to figure this out.

@Override
public void run(ExampleConfiguration configuration, Environment environment) throws Exception {
  environment.lifecycle().addServerLifecycleListener(new ServerLifecycleListener() {
    @Override
    public void serverStarted(Server server) {
      for (Connector connector : server.getConnectors()) {
        if (connector instanceof ServerConnector) {
          ServerConnector serverConnector = (ServerConnector) connector;
          System.out.println(serverConnector.getName() + " " + serverConnector.getLocalPort());
          // Do something useful with serverConnector.getLocalPort()
        }
      }
    }
  });
}