PM85781: NOCLASSDEFFOUNDERROR CAUSED BY A CONCURRENTMODIFICATIONEXCEPTION

APAR status

• Closed as program error.

Error description

• NoClassDefFoundError caused by a
  ConcurrentModificationException on appllication using Java
  Persistence API (JPA)
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  IBM WebSphere Application Server            *
  *                  Liberty profile users of                    *
  *                  container-managed Java Persistence API      *
  *                  (JPA)                                       *
  ****************************************************************
  * PROBLEM DESCRIPTION: Concurrency during application start    *
  *                      can result in                           *
  *                      ConcurrentModificationException from    *
  *                      class loading.                          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Container-managed JPA allows persistence providers to register
  class transformers that intercept class loads.  The JPA
  container maintains a list of class transformers, but the list
  is not thread-safe, so concurrent class loads can cause a
  ConcurrentModificationException.
  

Problem conclusion

• The list of class transformers was changd to be thread-safe.
  
  The fix for this APAR is currently targeted for inclusion in
  the fix pack following 8.5.0.2.  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:

  PM77840

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

Fix information

• Fixed component name

  LIBERTY PROFILE

• Fixed component ID

  5724J0814

Applicable component levels

• R850 PSY

     UP