PH07008: HAVE OPENJPA UPDATE THE DESCRIMINATOR CLASS CACHE AS CLASSES BECOME LOADED AND REGISTERED IN THE METADATAREPOSITORY

9.0.5.1: WebSphere Application Server traditional Version 9.0.5 Fix Pack 1
9.0.5.2: WebSphere Application Server traditional Version 9.0.5 Fix Pack 2
8.5.5.17: WebSphere Application Server V8.5.5 Fix Pack 17
9.0.5.3: WebSphere Application Server traditional Version 9.0.5 Fix Pack 3
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

• OpenJPA currently only loads their descriminator class cache
  once. If any classes are not registered at that time, they will
  not be available for future cache checks, leading to inaccurate
  ClassNotFoundExceptions. The fix for this will be to update
  OpenJPA to allow the cache to be updated as classes become
  loaded and registered with the MetaDataRepository.
  
  
  The problem can be observed in applications that make use of JPA
  discriminators. For classes not registered in the cache,
  exceptions are seen as follows:
  --
  org.apache.openjpa.persistence.ArgumentException:
  Could not map discriminator value "SUBCLASS_OF_A" to any
  known subclasses of the requested
  class "A"
  --
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server V8.5 - Java Persistence API - JPA    *
  *                  2.0 & OpenJPA                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: The discriminator class cache throws    *
  *                      CNFEs if classes are not registered     *
  *                      in time                                 *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  OpenJPA currently only loads their descriminator class cache
  once. If any classes are not registered at that time, they will
  not be available for future cache checks, leading to inaccurate
  ClassNotFoundExceptions. The is a very short race condition
  that results in CNFE from OpenJPA's discriminator class cache.
  

Problem conclusion

• The fix for this APAR changes the OpenJPA implementation
  and involves an update to the thirdparty source. See
  https://issues.apache.org/jira/browse/OPENJPA-2767
  
  This fix is currently targeted for WebSphere Application
  Server 9.0.5.1, 8.5.5.16, and WebSphere Liberty 19.0.0.7.
  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

  WEBSPHERE FOR Z

• Fixed component ID

  5655I3500

Applicable component levels

• R850 PSY

     UP