MessageConsumer receives no messages

Question

Hi,
i successfully establish a connection to a remote SonicMQ message broker (from one of our custumers) and then call receive to ask the consumer for any
messages in the queue, but i always get a NULL return result, indicating that the "MessageConsumer was concurrently closed" (as stated in
the java api for jms).
I use exactly the same testing code to receive messages as our customer does it (which successfully can read any messages). The queue
is not empty, we have balanced all settings ensuring they are the same.
My question is: could it be a firewall or other networking issue? or are there any security policies that must be explicity set to allow
me to read messages from the queue?
Any ideas and hints are appreciated.
Many thanks in advance!

Answer 1

markus2007 wrote:
Hi again,
here is some code. I don�t receive any messages. If you're monitoring the queue, does this mean the message never gets there, or they arrive and pile up?
Receive always returns null, no matter how big the timeout is specified. i have also
tried without a timeout (blocking forever) and asynchronous method (via mesage listener), but i�m not able to get any messages.
And this is exact the same code our customer uses to read messages from the queue.Forget about that. It's not exactly the same, because it's on your server. You've done something wrong, and it's your job to figure out what.
I can connect to the queue without any problems, and the customer can see via his message browser that there are messages
"consumed" as i access the queue, but they never reach me...
progress.jclient.message.QueueConnectionFactory factory = new progress.jclient.message.QueueConnectionFactory();
factory.setConnectionURLs(hostname);
progress.jclient.message.Connection conn = factory.createQueueConnection(user, password);
progress.jclient.message.QueueSession session= conn.createQueueSession(false, Session.CLIENT_ACKNOWLEDGE);
progress.jclient.message.Queue queue = session.createQueue(queueName);
progress.jclient.message.QueueReceiver receiver= session.createReceiver(queue);
Message m = receiver.receive(30000);  Edited by: markus2007 on Apr 17, 2008 12:44 PM
Edited by: markus2007 on Apr 17, 2008 12:46 PMI don't see any line that starts the connection. Shouldn't you have:
QueueConnectionFactory factory = new QueueConnectionFactory();
factory.setConnectionURLs(hostname);
Connection conn = factory.createQueueConnection(user, password);
QueueSession session= conn.createQueueSession(false, Session.CLIENT_ACKNOWLEDGE);
Queue queue = session.createQueue(queueName);
QueueReceiver receiver= session.createReceiver(queue);
conn.start();  // Isn't this line necessary?
Message m = receiver.receive(30000);  I've not done it this way. I usually create a MessageListener and register it with the queue before starting. I've used WebLogic JMS, not Sonic.
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