PM54812: WEBSPHERE APPLICATION SERVER V6.1.X SERVICE INTEGRATION BUS MESSAGING ENGINE THROWS NULLPOINTEREXCEPTION

6.1.0.47: WebSphere Application Server V6.1 Fix Pack 47
6.1.0.45: Java SDK 1.5 SR14 Cumulative Fix for WebSphere Application Server
6.1.0.47: Java SDK 1.5 SR16 Cumulative Fix for WebSphere Application Server

APAR status

• Closed as program error.

Error description

• WSVR0605W messages reporting hung threads are logged in the
  SystemOut.log of the server hosting the WebSphere Application
  Server v6.1.x Service Integration Bus messaging engine.
  The hung threads have the following stack:
  
  Thread-1:
  at java.lang.Object.wait(Native Method)
  at java.lang.Object.wait(Object.java:199)
  at com.ibm.ws.objectManager.ManagedObject.lock(ManagedObject.
  java:653)
  at com.ibm.ws.objectManager.ManagedObject.preDelete(Managed
  Object.java:1112)
  at com.ibm.ws.objectManager.InternalTransaction.delete
  (InternalTransaction.java:1596)
  at com.ibm.ws.objectManager.Transaction.delete(Transaction.
  java:481)
  at com.ibm.ws.sib.msgstore.persistence.objectManager.
  PersistableImpl.removeFromStore(PersistableImpl.java:553)
  at com.ibm.ws.sib.msgstore.persistence.objectManager.
  
  BatchingContextImpl.internalDelete(BatchingContextImpl.java:466)
  
  Thread-2:
  at java.lang.Object.wait(Native Method)
  at java.lang.Object.wait(Object.java:199)
  at com.ibm.ws.objectManager.ObjectManagerState$Checkpoint
  Helper.waitForCheckpoint(ObjectManagerState.java:3147)
  at com.ibm.ws.objectManager.ObjectManagerState$Checkpoint
  Helper.access$000(ObjectManagerState.java:2952)
  at com.ibm.ws.objectManager.ObjectManagerState.waitForCheck
  point(ObjectManagerState.java:1093)
  at com.ibm.ws.objectManager.ObjectManagerState.transaction
  Pacing(ObjectManagerState.java:2155)
  at com.ibm.ws.objectManager.ObjectManager.getTransaction
  (ObjectManager.java:452)
  at com.ibm.ws.sib.msgstore.persistence.objectManager.
  BatchingContextImpl.<init>(BatchingContextImpl.java:124)
  at com.ibm.ws.sib.msgstore.persistence.objectManager.
  PersistentMessageStoreImpl.prepare(PersistentMessageStore
  Impl.java:1267)
  at com.ibm.ws.sib.msgstore.transactions.XidParticipant.
  prepare(XidParticipant.java:367)
  
  Thread-3:
  at java.lang.Object.wait(Native Method)
  at java.lang.Object.wait(Object.java:231)
  at com.ibm.ws.sib.processor.utils.LockManager.lock(LockManager.
  java:105)
  at com.ibm.ws.sib.processor.impl.PtoPInputHandler.handle
  Message(PtoPInputHandler.java:526)
  at com.ibm.ws.sib.processor.impl.ProducerSessionImpl.send
  (ProducerSessionImpl.java:547)
  at com.ibm.ws.sib.api.jms.impl.JmsMsgProducerImpl.sendMessage
  (JmsMsgProducerImpl.java:1651)
  at com.ibm.ws.sib.api.jms.impl.JmsMsgProducerImpl.send
  (JmsMsgProducerImpl.java:1030)
  
  An FFDC is produced with the following Exception:
  
  Exception = java.lang.NullPointerException
  Source = com.ibm.ws.sib.msgstore.transactions.XidParticipant.
  prepare
  probeid = 1:431:1.57.1.12
  Stack Dump = java.lang.NullPointerException
  at com.ibm.ws.objectManager.ConcurrentLinkedList.resetTail
  SequenceNumber(ConcurrentLinkedList.java:235)
  at com.ibm.ws.objectManager.ConcurrentLinkedList.addEntry
  (ConcurrentLinkedList.java:503)
  at com.ibm.ws.sib.msgstore.persistence.objectManager.
  PersistableImpl.addToStore(PersistableImpl.java:354)
  at com.ibm.ws.sib.msgstore.persistence.objectManager.
  PersistableImpl.addToStore(PersistableImpl.java:228)
  at com.ibm.ws.sib.msgstore.persistence.objectManager.
  BatchingContextImpl.insert(BatchingContextImpl.java:192)
  at com.ibm.ws.sib.msgstore.task.AddTask.persist
  (AddTask.java:361)
  at com.ibm.ws.sib.msgstore.persistence.objectManager.
  PersistentMessageStoreImpl.prepare(PersistentMessage
  StoreImpl.java:1275)
  at com.ibm.ws.sib.msgstore.transactions.XidParticipant.
  prepare(XidParticipant.java:367)
  at com.ibm.ws.sib.msgstore.transactions.XidManager.
  prepare(XidManager.java:188)
  

Local fix

• Restart the JVM hosting the messaging engine
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Users of the default messaging provider     *
  *                  for IBM WebSphere Application Server using  *
  *                  a FileStore                                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: NullPointerException during FileStore   *
  *                      operation                               *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A NullPointerException would occur when attempting to invoke a
  method on a variable after checking to ensure it was not null.
  This was due to a race condition in which the variable would
  become null after checking, but before accessing, because this
  work was not done under a lock.
  

Problem conclusion

• The code has been fixed by taking a copy of the variable
  before checking for null, to prevent the race condition from
  occurring.
  
  The fix for this APAR is currently targeted for inclusion in
  fix pack 6.1.0.45.  Please refer to the Recommended Updates
  page for delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  PLAT MSG COM

• Fixed component ID

  620600101

Applicable component levels

• R200 PSY

     UP