hi,
I am using a message driven bean deployed in JBoss 4.0.2 to listen to a queue
in WebSphere MQ 5.3. Randomly after processing about couple of thousand
messages (sometimes hundreds) it stops responding and no further messages are
picked up from the queue.
Here is the mdb code:
| public void onMessage (Message message)
| {
| try{
| if (message instanceof TextMessage) {
| //Initialize the handler
| VOTSMessageHandler handler = new
VOTSMessageHandler();
|
| //Cast message to JMS TextMessage
| TextMessage msg = (TextMessage)message;
|
| //Extract message from the JMS TextMessage into
a stringbuffer
| StringBuffer text = new
StringBuffer(msg.getText());
|
| //Extract the message type from the message
body (VOTS--> first 6 characters)
| String msgType = text.substring(0,6);
|
| //Log the receipt of the message for debugging
| CmsLog.getMessageLog().info("Message received
with message ID "+ msgType+ " containing : "+ msg.getText());
|
| //invoke the handler method for further
processing
|
handler.getParsedMessage(text.toString(),msgType);
|
| }
| }
| catch(Exception e){
| //Rollback when any exception is thrown
| this.context.setRollbackOnly();
|
| //Log the exception for debugging
| CmsLog.getProcessLog().error("VOTS Message Processing
Failed : ");
| }
| }
|
jboss.xml
| <jboss>
| <enterprise-beans>
| <message-driven>
| <ejb-name>VOTSMessageBean</ejb-name>
| <destination-jndi-name>HCPDCMS/FROM.VOTS</destination-jndi-name>
| <configuration-name>Singleton Message Driven Bean</configuration-name>
| <resource-ref>
| <res-ref-name>HCPDCMS/FROM.VOTS</res-ref-name>
| <jndi-name>HCPDCMS/MQ_HCPDCMS_QCF</jndi-name>
| </resource-ref>
| </message-driven>
| </enterprise-beans>
| </jboss>
|
|
ejb-jar.xml
|
| <ejb-jar>
| <enterprise-beans>
| <message-driven>
| <ejb-name>VOTSMessageBean</ejb-name>
|
<ejb-class>com.vai.cms.ejb.message.vots.VOTSMessageBean</ejb-class>
| <transaction-type>Container</transaction-type>
| <acknowledge-mode>Auto-acknowledge</acknowledge-mode>
| <message-driven-destination>
|
<destination-type>javax.jms.Queue</destination-type>
| </message-driven-destination>
| <resource-ref>
| <res-ref-name>HCPDCMS/FROM.VOTS</res-ref-name>
|
<res-type>com.vai.cms.jmx.wsmq.WSMQConnectionFactory</res-type>
| <res-auth>Container</res-auth>
| </resource-ref>
| </message-driven>
| </enterprise-beans>
| <assembly-descriptor>
| <container-transaction>
| <method>
| <ejb-name>VOTSMessageBean</ejb-name>
| <method-name>onMessage</method-name>
| <method-params>
|
<method-param>javax.jms.Message</method-param>
| </method-params>
| </method>
| <trans-attribute>RequiresNew</trans-attribute>
| </container-transaction>
| </assembly-descriptor>
| </ejb-jar>
|
After analyzing the thread dump, I see a deadlock that I cannot understand.
Here is the thread:
| "MQQueueAgent (FROM.VOTS)" daemon prio=5 tid=0x47c30230 nid=0x240c in
Object.wait() [0x4d04f000..0x4d04fbec]
| at java.lang.Object.wait(Native Method)
| - waiting on <0x0acbcea0> (a java.util.ArrayList)
| at java.lang.Object.wait(Object.java:474)
| at
org.jboss.jms.asf.StdServerSessionPool.getServerSession(StdServerSessionPool.java:206)
| - locked <0x0acbcea0> (a java.util.ArrayList)
| at
com.ibm.mq.jms.MQConnectionConsumer.deliverNow(MQConnectionConsumer.java:592)
| at
com.ibm.mq.jms.MQConnectionConsumer.deliver(MQConnectionConsumer.java:554)
| at com.ibm.mq.jms.MQQueueAgent.deliver(MQQueueAgent.java:723)
| - locked <0x0acbcf40> (a java.util.Vector)
| at
com.ibm.mq.jms.MQQueueAgentThread.processMessage(MQQueueAgentThread.java:763)
| at
com.ibm.mq.jms.MQQueueAgentThread.run(MQQueueAgentThread.java:933)
| at java.lang.Thread.run(Thread.java:595)
|
It is obviously waiting on the same object that it locked (in bold). Does
anybody have any idea how to fix this?
Any pointer will be appreicated!
Thanks.
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