PI52838: OptimisticCollisionException fails to deserialize when using EntityManager

APAR status

• Closed as program error.

Error description

• When the server has an association that the client isn't aware
  of, the key can fail to deserialize.  The exception will appear
  similar to below.
  
  Caused by:
  com.ibm.ws.xsspi.xio.exception.ObjectGridXIOException: An
  exception was received from the server, but it could not be
  processed from the ServerException message. exception_type:
  TRANSACTION_EXCEPTION
  exception_id: 44666
  exception_message:
  "com.ibm.websphere.objectgrid.TransactionException:transaction
  rolled back, see caused by Throwable"
  endpoint_id: "44167150216b981fe000005056050080"
  completed: true
  class_name: "com.ibm.websphere.objectgrid.TransactionException"
  caused_by {
    exception_type: OPTIMISTIC_COLLISION
    exception_id: 44665
    exception_message:
  "com.ibm.websphere.objectgrid.plugins.OptimisticCollisionExcepti
  on:Optimistic version comparison indicates another transaction
  already changed this cache entry.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Users of eXtreme Scale who use              *
  *                  EntityManager with different associations.  *
  ****************************************************************
  * PROBLEM DESCRIPTION: When trying to deserialize an entity    *
  *                      and there are not as many associations  *
  *                      as expected, deserialization fails.     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The entity deserialization logic was updated to handle an
  expected association not being in the stream.  Additionally,
  OptimisticCollisionException processing on the server side was
  updated to use the key that was provided from the client,
  instead of the key that is currently in the grid.
  

Problem conclusion

• An interim fix is available for this APAR upon request.
  

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

  WS EXTREME SCAL

• Fixed component ID

  5724X6702

Applicable component levels

• R860 PSY

     UP