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Message
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| sriraj |
 Posted: Wed Dec 08, 2004 1:17 am Post subject: Problem with JMS on Clustered MQ Websphere OS/390 |
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Newbie
Joined: 08 Dec 2004
Posts: 3
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Hello,
We have a problem that begs urgent attention and I would appreciate any help I can receive at this point of time.
A little background; we are testing a point to point service which uses MQ for messaging. We tested the service / MQ using WSAD and everything works fine. We are using pure JMS and not MQ JMS. When we deploy on Websphere and then try communicating to the MQs (which are clustered) we recieve an error: MQJMS 2008 Failed to Open the Queue.
A little more detail, we are listening on one queue and processing the incoming message, after which we are posting to an outgoing queue. We are able to listen to the incoming queue and pickup the message. This incoming message also contains the queue name to which we must post on the outgoing side. When we try to post to this queue, we recieve the above error. I am posting the code snippet also below
| Code: |
// Create all the JMS objects
Queue queue = null;
QueueConnectionFactory queueConnectionFactory = null;
QueueSession queueSession = null;
QueueConnection queueConnection = null;
QueueSender queueSender = null;
TextMessage message = null;
try {
// Obtain the queue name from the incoming message and strip out the queue manager. Basically the end result will look like queue:///XXXX.HOME
queueName = returnMessageQueue.toString();
queueName = queueName.substring(15,35);
// get the instance of the ejbFactory class
ejbFactory = EJBFactory.getInstance();
// look up the queue connection factory
queueConnectionFactory =
ejbFactory.lookUpQueueConnectionFactory(
queueConnectionFactoryJndiName,
queueConnectionFactoryClassName);
// obtain a queue connection
queueConnection = queueConnectionFactory.createQueueConnection();
// create a queue session
queueSession =
queueConnection.createQueueSession(
true,
Session.AUTO_ACKNOWLEDGE);
returnMessageQueue = queueSession.createQueue(queueName);
// create a queueSender which will send the message on the queue
queueSender = queueSession.createSender(returnMessageQueue);
// create an object of type message fronm the string message
message = queueSession.createTextMessage(returnMessage);
queueConnection.start();
//send the message
queueSender.send(message);
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Please help! I'd really appreciate any help I can get. If you need more info, please post and I'll reply ASAP. |
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| jefflowrey |
| Posted: Wed Dec 08, 2004 3:50 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Where do you assign returnMessageQueue?
How do you know that your substring is returning a valid value?
_________________
I am *not* the model of the modern major general. |
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| sriraj |
| Posted: Wed Dec 08, 2004 7:44 am Post subject: |
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Newbie
Joined: 08 Dec 2004
Posts: 3
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| We are printing out the value in the logs and it is a valid queue name. Another symptom that we are having is the messages are getting lost enroute to the outgoing queue without a trace. The message is processed and then the send operation takes place but the message never goes to the outgoing queue. Can someone please help. |
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| jefflowrey |
| Posted: Wed Dec 08, 2004 7:55 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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What is the MQException that is attached to the JMS Exception?
"The message never goes to the output queue" usually means "I didn't commit the transaction".
_________________
I am *not* the model of the modern major general. |
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| bower5932 |
| Posted: Wed Dec 08, 2004 7:56 am Post subject: |
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Jedi Knight
Joined: 27 Aug 2001
Posts: 3023
Location: Dallas, TX, USA
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Get the linked exception:
| Code: |
} catch( JMSException je ) {
System.out.println("JMS Exception: " + je);
// check for a linked exception
Exception le = je.getLinkedException();
if (le != null) {
System.out.println("Linked exception: " + le);
}
} |
This will give you the underlying WMQ error which will point to what is wrong. And if you are getting a 2085, then you actually need to make sure that the underlying WMQ queue for the JNDI q is created. |
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| fjb_saper |
| Posted: Wed Dec 08, 2004 1:59 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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A better way would be to add
| Code: |
import com.ibm.mq.jms.*;
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and then clear the qmgr name:
| Code: |
| (MQQueue(returnMessageQueue)).setQManager(""); |
This is from memory so forgive me if it is not so precise.
Enjoy  |
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| sriraj |
| Posted: Wed Dec 08, 2004 7:31 pm Post subject: |
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Newbie
Joined: 08 Dec 2004
Posts: 3
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Thank you all for your help. The problem has been resolved. The root cause was that the queue manager was not a part of the cluster, so it did not have the ability to write to messages in the cluster. Thus the messages were getting lost and the error.
Thanks again |
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