[AMQ-1994] NullPointerException in ActiveMQMessageConsumer#acknowledge(ActiveMQMessage) on acknowledgment.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 5.1.0
• Fix Version/s: NEEDS_REVIEW
• Component/s: JMS client

Environment

Windows Terminal Server 2003 / Intel x86 based

• Assignee: Unassigned
• Reporter: MZ
• Created: 03/Nov/08 13:30
• Updated: 09/Mar/11 22:13
• Resolved: 09/Mar/11 22:13

Description

Hi Folks!

We have a problem on acknowledge message with an ActiveMQ 5 Server. We are using AqtiveMQ for multi-threaded message processing. On a few Threads we continuously receiving messages, add them to a BlockingQueue and processing them with a another thread reading on the Queue. After processing is done, the message is acknowledged. We using durable consumers to make sure that we won't miss a message on a failure.

We sometimes (one time in 2-3 weeks) receive the following exception on acknowledging a message (decision dept is name of the RCP application):

2008-10-28 08:20:21,215 WARN [main] org.csstudio.nams.application.department.decision.DecisionDepartmentActivator: unable to acknowledge message: Alarmnachricht: JMS-Message: ActiveMQMapMessage

{commandId = 401366, responseRequired = true, messageId = ID:krynfsb-52783-1224106527774-1:0:1:133789:1, originalDestination = null, originalTransactionId = null, producerId = ID:krynfsb-52783-1224106527774-1:0:1:133789, destination = topic://ALARM, transactionId = null, expiration = 1225182021162, timestamp = 1225178421162, arrival = 0, correlationId = null, replyTo = null, persistent = true, type = null, priority = 4, groupID = null, groupSequence = 0, targetConsumerId = null, compressed = false, userID = null, content = org.apache.activemq.util.ByteSequence@10c7e04, marshalledProperties = null, dataStructure = null, redeliveryCounter = 0, size = 0, properties = null, readOnlyProperties = true, readOnlyBody = true, droppable = false}

ActiveMQMapMessage{ theTable =

{ ... }

}
org.csstudio.nams.service.messaging.exceptions.MessagingException: acknowledge failed
at org.csstudio.nams.service.messaging.declaration.DefaultNAMSMessage.acknowledge(DefaultNAMSMessage.java:51)
at org.csstudio.nams.application.department.decision.DecisionDepartmentActivator.receiveMessagesUntilApplicationQuits(DecisionDepartmentActivator.java:878)
at org.csstudio.nams.application.department.decision.DecisionDepartmentActivator.performNormalWork(DecisionDepartmentActivator.java:489)
at org.csstudio.nams.application.department.decision.DecisionDepartmentActivator.start(DecisionDepartmentActivator.java:404)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:169)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:508)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:447)
at org.eclipse.equinox.launcher.Main.run(Main.java:1173)
Caused by: javax.jms.JMSException: java.lang.NullPointerException
at org.apache.activemq.util.JMSExceptionSupport.create(JMSExceptionSupport.java:46)
at org.apache.activemq.command.ActiveMQMessage.acknowledge(ActiveMQMessage.java:99)
at org.csstudio.nams.service.messaging.impl.jms.JMSConsumer$1.acknowledge(JMSConsumer.java:211)
at org.csstudio.nams.service.messaging.declaration.DefaultNAMSMessage.acknowledge(DefaultNAMSMessage.java:49)
... 15 more
Caused by: java.lang.NullPointerException
at java.util.LinkedList.clear(Unknown Source)
at org.apache.activemq.ActiveMQMessageConsumer.acknowledge(ActiveMQMessageConsumer.java:761)
at org.apache.activemq.ActiveMQSession.acknowledge(ActiveMQSession.java:1383)
at org.apache.activemq.ActiveMQMessageConsumer$1.execute(ActiveMQMessageConsumer.java:445)
at org.apache.activemq.command.ActiveMQMessage.acknowledge(ActiveMQMessage.java:95)
... 17 more

Up from this time, we always get the following trace on receiving:

2008-10-28 08:20:37,808 FATAL JMSConsumer#WorkThread-1 org.csstudio.nams.service.messaging.impl.jms.JMSConsumer$WorkThread: Unexpected exception during recieving message from jms
java.lang.NullPointerException
at java.util.LinkedList.addBefore(Unknown Source)
at java.util.LinkedList.addFirst(Unknown Source)
at org.apache.activemq.ActiveMQMessageConsumer.beforeMessageIsConsumed(ActiveMQMessageConsumer.java:649)
at org.apache.activemq.ActiveMQMessageConsumer.receive(ActiveMQMessageConsumer.java:429)
at org.csstudio.nams.service.messaging.impl.jms.JMSConsumer$WorkThread.run(JMSConsumer.java:85)

Do you know this problem? Do you have some ideas what happens?

Thanks,
Gösta and Matthias