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MQSeries.net Forum Index » IBM MQ Java / JMS » Messaging driven bean listening for message on an MQQueue

Messaging driven bean listening for message on an MQQueue

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Vin

Posted: Sat Sep 27, 2003 9:24 pm Post subject: Messaging driven bean listening for message on an MQQueue

Master

Joined: 25 Mar 2002
Posts: 212
Location: India

I'm trying to deploy a Message Driven Bean listening for message to an MQSeries queue (local). I registered the MQQueueConnectionFactory and MQQueue in the JNDI namespace of weblogic and I gave the reference of the queue in the weblogic-ejb-jar.xml. The problem I'm having is that the message driven bean is not recieving any messages from the local MQSeries queue. Is there something that I'm doing wrong. Did anyone do this kind of an implementation before. Any help is appreciated

Keka

Posted: Sun Sep 28, 2003 9:03 am Post subject:

Voyager

Joined: 28 Dec 2002
Posts: 96

We have done that and it works perfectly.

How are you getting the message off?? did you implement the message listener interface or MDB just listens on the queue in an infinite loop??
We implemented the second one..
Did you check that the MDB is listening on that queue. Queue names are case sensitive. It is possible that the MDB is not listening on that queue. It is possible that the JNDI binding was not successful.

The best place to start with is to look at the qstatus and get the process ID. See if that is your MDBs process ID.

Hope this helps
_________________
Keka

Vin

Posted: Sun Sep 28, 2003 10:57 am Post subject:

Master

Joined: 25 Mar 2002
Posts: 212
Location: India

Keka,
Thanks for the reply. We are using weblogic as our app server and I already bound the MQQueueConnectionFactory and the MQQueue in JNDI. I can see this using the admin console. I was able to recieve messages using a simple QueueReciever example supplied with weblogic ( I tweaked this to point to the weblogic queue). We want to use MDBs, which is the approach we want to follow. I deployed the MDB and put a message on the testqueue and the MDB never seems to pick it up.

I looked at the JMSConnectionAlive attribute in the weblogic console and it shows a false there. What is the qstatus which you were referring to? also how can I check whether the process id is the same? this is how my weblogic-ejb-jar.xml looks like

<?xml version="1.0"?>

<!DOCTYPE weblogic-ejb-jar PUBLIC "-//BEA Systems, Inc.//DTD WebLogic 7.0.0 EJB//EN" "http://www.bea.com/servers/wls700/dtd/weblogic-ejb-jar.dtd">



<weblogic-ejb-jar>

<weblogic-enterprise-bean>
<ejb-name>jmsMessageformat</ejb-name>
<message-driven-descriptor>
<pool>
<max-beans-in-free-pool>200</max-beans-in-free-pool>
<initial-beans-in-free-pool>20</initial-beans-in-free-pool>
</pool>
<initial-context-factory>
<destination-jndi-name>MQQueue</destination-jndi-name>
</message-driven-descriptor>
<jndi-name>jms.Messageformat</jndi-name>
</weblogic-enterprise-bean>

</weblogic-ejb-jar>

Please let me know if you find anything wrong with this.

Thanks so much

Vin

Posted: Sun Sep 28, 2003 11:35 am Post subject:

Master

Joined: 25 Mar 2002
Posts: 212
Location: India

<weblogic-ejb-jar>

<weblogic-enterprise-bean>
<ejb-name>jmsMessageformat</ejb-name>
<message-driven-descriptor>
<pool>
<max-beans-in-free-pool>200</max-beans-in-free-pool>
<initial-beans-in-free-pool>20</initial-beans-in-free-pool>
</pool>
<destination-jndi-name>MQQueue</destination-jndi-name>
<provider-url>t3://192.168.0.2:7001</provider-url>
<initial-context-factory>weblogic.jndi.WLInitialContextFactory</initial-context-factory>
<connection-factory-jndi-name>MQQueueConnectionFactory</connection-factory-jndi-name>
</message-driven-descriptor>
<jndi-name>jms.Messageformat</jndi-name>
</weblogic-enterprise-bean>

</weblogic-ejb-jar>

I get the following exception after changing my deployment descriptor

java.lang.NullPointerException - at java.lang.NullPointerException

at weblogic.jms.client.JMSSession.setMessageListener(JMSSession.java:109
7)
at weblogic.ejb20.internal.JMSConnectionPoller.disconnectFromJMS(JMSConn
ectionPoller.java:1141)
at weblogic.ejb20.internal.JMSConnectionPoller.cancelJMSConnectionPollin
g(JMSConnectionPoller.java:724)
at weblogic.ejb20.deployer.MessageDrivenBeanPoolInfoImpl.onUndeploy(Mess
ageDrivenBeanPoolInfoImpl.java:117)
at weblogic.ejb20.deployer.MessageDrivenBeanInfoImpl.onUndeploy(MessageD
rivenBeanInfoImpl.java:662)
at weblogic.ejb20.internal.BaseEJBHome.undeploy(BaseEJBHome.java:228)
at weblogic.ejb20.internal.MessageDrivenEJBHome.undeploy(MessageDrivenEJ
BHome.java:292)
at weblogic.ejb20.deployer.EJBDeployer.deactivate(EJBDeployer.java:1738)

at weblogic.ejb20.deployer.EJBModule.doDeactivate(EJBModule.java:618)
at weblogic.ejb20.deployer.EJBModule.deactivate(EJBModule.java:443)
at weblogic.j2ee.J2EEApplicationContainer.deactivateModule(J2EEApplicati
onContainer.java:1612)
at weblogic.j2ee.J2EEApplicationContainer.syncState(J2EEApplicationConta

Vin

Posted: Tue Sep 30, 2003 7:56 pm Post subject:

Master

Joined: 25 Mar 2002
Posts: 212
Location: India

I finally got this to work. I had to put tihs line in my code and everything started working fine

QueueReceiver receiver = qSession.createReceiver(queueName);
qcon.start();

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