There appears to be a problem browsing queues with ActiveMQQueueBrowser when the connection is not explicitly opened before creation of the Session. This isn't in itself a problem but it does cause problems when a pooled connection factory is used as there isn't a guarantee of the connection being open at this stage.
Here's the code to replicate it. You need messages in the queue first. Commenting out //connection.start(); will ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(); connectionFactory.setBrokerURL("tcp://kittiwake:61616"); Connection connection = connectionFactory.createConnection(); //connection.start(); Session session = connection.createSession(true, Session.CLIENT_ACKNOWLEDGE); int msgCount = 0; Queue queue = session.createQueue("UcpQueue"); QueueBrowser browser = session.createBrowser(queue); ActiveMQQueueBrowser b; for (final Enumeration iter = browser.getEnumeration(); iter.hasMoreElements();) { final Message message = (Message) iter.nextElement(); System.out.println("MessageID: " + message.getJMSMessageID()); msgCount++; } System.out.println("Count: " + msgCount); Possible prob is at line 166 of ActiveMQQueueBrowser in release 4.1.1 if( browseDone.get() || !session.isRunning() ) { destroyConsumer(); return false; } -- View this message in context: http://www.nabble.com/ActiveMQQueueBrowser-problem-with-not-yet-opened-Connections-tf4489009s2354.html#a12802140 Sent from the ActiveMQ - User mailing list archive at Nabble.com.