PI14544: BLUEPRINT APPLICATION STARTUP DEADLOCKS WHEN USING A BEAN FOR A REFERENCE-LISTENERS AND THE BEAN USES THE REFERENCE

8.5.5.3: WebSphere Application Server V8.5.5 Fix Pack 3
8.5.5.4: WebSphere Application Server V8.5.5 Fix Pack 4
8.5.5.5: WebSphere Application Server V8.5.5 Fix Pack 5
8.5.5.6: WebSphere Application Server V8.5.5 Fix Pack 6
8.5.5.7: WebSphere Application Server V8.5.5 Fix Pack 7
8.5.5.8: WebSphere Application Server V8.5.5 Fix Pack 8
8.5.5.9: WebSphere Application Server V8.5.5 Fix Pack 9
8.5.5.10: WebSphere Application Server V8.5.5 Fix Pack 10
8.5.5.11: WebSphere Application Server V8.5.5 Fix Pack 11
8.5.5.12: WebSphere Application Server V8.5.5 Fix Pack 12
8.5.5.13: WebSphere Application Server V8.5.5 Fix Pack 13
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
8.5.5.15: WebSphere Application Server V8.5.5 Fix Pack 15
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
8.5.5.17: WebSphere Application Server V8.5.5 Fix Pack 17
8.5.5.20: WebSphere Application Server V8.5.5.20
8.5.5.18: WebSphere Application Server V8.5.5 Fix Pack 18
8.5.5.19: WebSphere Application Server V8.5.5 Fix Pack 19
8.5.5.16: WebSphere Application Server V8.5.5 Fix Pack 16
8.5.5.21: WebSphere Application Server V8.5.5.21

APAR status

• Closed as program error.

Error description

• Blueprint application startup deadlocks when using
  reference-listeners that refer to a bean that uses the
  reference, and where another bundle uses the service for that
  bean.
  
  
  Java core dumps of the hang will show two or more threads with
  the name containing: "Blueprint Extender:", and the top of the
  stack similar to:
  
  at sun/misc/Unsafe.park(Native Method)
  at
  java/util/concurrent/locks/LockSupport.park(LockSupport.java:182
  )
  at
  java/util/concurrent/locks/AbstractQueuedSynchronizer.parkAnd
  CheckInterrupt(AbstractQueuedSynchronizer.java:822)
  at
  java/util/concurrent/locks/AbstractQueuedSynchronizer.doAcquireS
  haredInterruptibly(AbstractQueuedSynchronizer.java:980)
  at
  java/util/concurrent/locks/AbstractQueuedSynchronizer.acquireSha
  redInterruptibly(AbstractQueuedSynchronizer.java:1292)
  at
  java/util/concurrent/FutureTask$Sync.innerGet(FutureTask.java:22
  9)
  at java/util/concurrent/FutureTask.get(FutureTask.java:94)
  at
  org/apache/aries/blueprint/di/AbstractRecipe.create(AbstractReci
  pe.java: 93)
  

Local fix

• Currently our workaround is to remove the reference-listener in
  the datasource-management reference.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server using Blueprint                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: A deadlock can occur during blueprint   *
  *                      application start.                      *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Blueprint applications can dead lock when starting if the
  application is configured such that a reference-listener
  references a bean that also uses the reference containing the
  reference, as well as another service that uses the same bean.
  During start, multiple threads are used to start the
  application, and a deadlock can occur as two threads are
  waiting for the blueprint startup to complete on the other
  thread.
  

Problem conclusion

• The blueprint startup sequence has been altered so that
  services are not registered before they are ready for use.
  
  The fix for this APAR is currently targeted for inclusion in
  fix pack 8.5.5.3.  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

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels

• R850 PSY

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