PM27840: PERSISTENCE MGR RELIES ON VALUE EQUALITY (.HASHCODE() AND .EQUALS()) OF LOCAL ENTITY WRAPPERS.

6.1.0.37: Java SDK 1.5 SR12 FP3 Cumulative Fix for WebSphere
7.0.0.17: Java SDK 1.6 SR9 FP1 Cumulative Fix for WebSphere Application Server
6.1.0.47: WebSphere Application Server V6.1 Fix Pack 47
7.0.0.27: Java SDK 1.6 SR13 FP2 Cumulative Fix for WebSphere Application Server
6.1.0.39: Java SDK 1.5 SR12 FP4 Cumulative Fix for WebSphere Application Server
6.1.0.41: Java SDK 1.5 SR12 FP5 Cumulative Fix for WebSphere Application Server
6.1.0.43: Java SDK 1.5 SR13 Cumulative Fix for WebSphere Application Server
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
7.0.0.19: Java SDK 1.6 SR9 FP2 Cumulative Fix for WebSphere Application Server
7.0.0.21: Java SDK 1.6 SR9 FP2 Cumulative Fix for WebSphere
7.0.0.23: Java SDK 1.6 SR10 FP1 Cumulative Fix for WebSphere
7.0.0.25: Java SDK 1.6 SR11 Cumulative Fix for WebSphere Application Server
7.0.0.27: Java SDK 1.6 SR12 Cumulative Fix for WebSphere Application Server
7.0.0.29: Java SDK 1.6 SR13 FP2 Cumulative Fix for WebSphere Application Server
7.0.0.45: Java SDK 1.6 SR16 FP60 Cumulative Fix for WebSphere Application Server
7.0.0.31: Java SDK 1.6 SR15 Cumulative Fix for WebSphere Application Server
7.0.0.35: Java SDK 1.6 SR16 FP1 Cumulative Fix for WebSphere Application Server
7.0.0.37: Java SDK 1.6 SR16 FP3 Cumulative Fix for WebSphere Application Server
7.0.0.39: Java SDK 1.6 SR16 FP7 Cumulative Fix for WebSphere Application Server
7.0.0.41: Java SDK 1.6 SR16 FP20 Cumulative Fix for WebSphere Application Server
7.0.0.43: Java SDK 1.6 SR16 FP41 Cumulative Fix for WebSphere Application Server

APAR status

• Closed as program error.

Error description

• Persistence manager relies on value equality (.hashCode() and
  .equals()) of local entity wrappers, which is not currently
  guaranteed by the EJB container.
  Note: the wrapper manager cache size is proportional to
  the EJB cache size, so increasing the EJB cache size will reduce
  the chances of problems occurring.
  

Local fix

• Target to be fixed in next release.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  WebSphere Application Server users of       *
  *                  container-managed persistence (CMP)         *
  *                  version 2.0 enterprise Java Beans (EJBs)    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Removing a local entity belonging       *
  *                      to a 1-to-many container-managed        *
  *                      relationship can fail to remove the     *
  *                      entity from the list.                   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Local entity beans are referenced by proxy objects that
  delegate to actual bean instances.  The EJB container
  maintains proxy objects in a "wrapper cache" that has a
  least-recently used eviction policy.  The persistence manager
  component was relying on value equality (.hashCode and
  .equals) of local entity proxy objects in order to remove
  entities from inverse container-managed relationship lists, but
  the EJB container does not implement value equality for local
  entity proxy objects.  If a container-managed relationship
  list contains a proxy object that has been evicted from the
  wrapper cache, and a remove is run on a different proxy
  object for the same entity, then the stale proxy object is not
  removed from the list.  Subsequent attempts to iterate over
  the list or to remove the containing entity result in
  erroneous NoSuchEntityException.
  
  The rate of eviction from the wrapper cache is directly
  correlated to the size of the EJBCache.  In general, only
  long-running transactions will cause a problem.
  

Problem conclusion

• The EJB container has been updated to implement value equality
  of local proxy objects.
  
  The fix for this APAR is currently targeted for inclusion in
  fix packs 6.1.0.37 and 7.0.0.17.  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 APP S

• Fixed component ID

  5724J0800

Applicable component levels

• R61A PSY

     UP

• R61H PSY

     UP

• R61I PSY

     UP

• R61P PSY

     UP

• R61S PSY

     UP

• R61W PSY

     UP

• R61Z PSY

     UP

• R700 PSY

     UP