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Author

How to form a MDB with the topic?

Qian Yang
Greenhorn

Joined: Mar 12, 2003
Posts: 1
I used JBoss 3.0 and JBoss JMS 3.04 for MDB. If MDB listen to a queue, it worked fine. But I have the problem when I formed it as a topic.
The following is my Deployment descriptor modified from a queue:
1. ejb-jar.xml:
<ejb-jar>
<enterprise-beans>
<message-driven>
<ejb-name>WorkAgentMessage</ejb-name>
<ejb-class>com.eidea.ejb.component.automation.WorkAgentMessageBean</ejb-class>
<transaction-type>Container</transaction-type>
<message-selector>executionState ='open.ready_to_run'</message-selector>
<acknowledge-mode>AUTO_ACKNOWLEDGE</acknowledge-mode>
<message-driven-destination>
<destination-type>javax.jms.Topic</destination-type>
<subscription-durability>Durable</subscription-durability>
</message-driven-destination>
</message-driven>
</enterprise-beans>
<assembly-descriptor>
<container-transaction>
<method>
<ejb-name>WorkAgentMessage</ejb-name>
<method-name>*</method-name>
</method>
<trans-attribute>Required</trans-attribute>
</container-transaction>
</assembly-descriptor>
</ejb-jar>
2. jboss.xml
<jboss>
<enterprise-beans>
<message-driven>
<ejb-name>WorkAgentMessage</ejb-name>
<configuration-name>Standard Message Driven Bean</configuration-name>
<destination-jndi-name>topic/DefaultChannel</destination-jndi-name>
<jndi-name>WorkAgentMessage</jndi-name>
</message-driven>
</enterprise-beans>
</jboss>
I got the following error in deployment
=============================
15:14:41,203 WARN [JMSContainerInvoker] JMS provider failure detected:
org.jboss.mq.SpyJMSException: Cannot subscribe to this Destination: null
at org.jboss.mq.Connection.addConsumer(Connection.java:974)
===============================
I checked JBoss console, the deployed topic DefaultChannel is there.
When I modified <destination-type> in ejb-jar.xml from javax.jms.Topic to Topic, the complain in deploy is gone, but onMessage() in MDB didn't get called in runtime.
I'd be very appreciated if anyone can help me to solve this issue.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: How to form a MDB with the topic?
 
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