Examples of io.vertx.core.net.NetServer.listen()

    // Now change something - but server should still listen at previous port
    options.setPort(1235);
    server.connectHandler(sock -> {
      testComplete();
    });
    server.listen(ar -> {
      assertTrue(ar.succeeded());
      client.connect(1234, "localhost", ar2 -> {
        assertTrue(ar2.succeeded());
      });
    });

        clusterManager.<String, ServerID>getAsyncMultiMap("subs", null, ar2 -> {
          if (ar2.succeeded()) {
            AsyncMultiMap<String, ServerID> subs = ar2.result();
            NetServer server = createNetServer(new NetServerOptions().setPort(options.getClusterPort()).setHost(options.getClusterHost()));
            EventBusImpl.EventBusNetServer ebServer = new EventBusImpl.EventBusNetServer(server);
            server.listen(asyncResult -> {
              if (asyncResult.succeeded()) {
                // Obtain system configured public host/port
                int publicPort = Integer.getInteger("vertx.cluster.public.port", -1);
                String publicHost = System.getProperty("vertx.cluster.public.host", null);

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