[rabbitmq-discuss] Failure to return from call to newConnection()

McMahon, James S (TASC) james.mcmahon at TASC.COM
Mon Oct 8 21:02:25 BST 2012

      I am experiencing a problem that I have been unable to pin down. When I attempt to use a java class to listen for messages bound to a particular exchange by a particular routing key, I get a "Connection timed out" error. Here is my code:

public class ReceiveLogsDirect {

  private static final String EXCHANGE_NAME = "ABC_SERVER";

  public static void main(String[] argv) throws Exception {

      String hostName = "localhost";
      int portNumber = 5672;

      if (argv.length < 1 || argv.length == 2 || argv.length > 3){
          System.err.println("Usage: ReceiveLogsDirect [session ID] [RabbitMQ server IP, optional] [RabbitMQ server port #, optional]");
      else if (argv.length == 1) {
          hostName = "localhost";
          portNumber = 5672; // default port that rabbitMQ listens to
      else if  (argv.length == 3) {
          hostName = argv[1];
          portNumber = Integer.parseInt(argv[2]);

      ConnectionFactory factory = new ConnectionFactory();


      System.out.println(" [*] HERE 1");
      Connection connection = factory.newConnection();
      System.out.println(" [*] HERE 2");
      Channel channel = connection.createChannel();

    channel.exchangeDeclare(EXCHANGE_NAME, "direct");
    String queueName = channel.queueDeclare().getQueue();

        channel.queueBind(queueName, EXCHANGE_NAME, argv[0]);
        System.out.println(" [*] bindingKey " + argv[0]  +  " is bound to queue on exchange " + EXCHANGE_NAME );

    System.out.println(" [*] Waiting for messages. To exit press CTRL+C");

    QueueingConsumer consumer = new QueueingConsumer(channel);
    channel.basicConsume(queueName, true, consumer);

    while (true) {
      QueueingConsumer.Delivery delivery = consumer.nextDelivery();
      String message = new String(delivery.getBody());
      String routingKey = delivery.getEnvelope().getRoutingKey();

      System.out.println(" [x] Received message for " + routingKey + " >>>" + message);

I used simple print statements to pinpoint the source of the problem at the line where I call newConnection().

     The error I get is this:

 [*] HERE 1
Exception in thread "main" java.net.ConnectException: Connection timed out: connect
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(Unknown Source)
    at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at com.rabbitmq.client.ConnectionFactory.createFrameHandler(ConnectionFactory.java:441)
    at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:480)
    at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:509)
    at com.tasc.prism.queue.ReceiveLogsDirect.main(ReceiveLogsDirect.java:55)

     My install of rabbitMQ is 2.7.0. Oddly, I have been able to execute this in another command shell window and it works. I am wondering why I'm having trouble in the second shell? Surely I must be able to execute multiple instances of ReceiveLogsDirect simultaneously, right?

    Could it be a runtime environment problem? I set my class path exactly the same in both shells.

    Any thoughts or similar experience with such a problem? Thank you.

- Jim

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