PM06960: THREADING PROBLEM IN THE WEAK REFERENCE USAGE

APAR status

• Closed as program error.

Error description

• Threading problem in the weak reference usage
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Users of IBM WebSphere Application Server   *
  *                  v7 Feature Pack for Service Component       *
  *                  Architecture (SCA) Refresh Pack v1.0.1      *
  ****************************************************************
  * PROBLEM DESCRIPTION: Threading problem in the weak           *
  *                      reference usage                         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Under a multithreading and stress test environment,
  commonj.sdo.helper.SDO.getHelperContextFactory(String
  implName) may throw a NullPointerException.
  

Problem conclusion

• The implementation of the SDO.getHelperContextFactory method
  is using the hash map with its value as a weak reference to
  avoid holding up the memory when the hash value for the
  HelperContextFactory is no longer used. Although the code has
  been checking whether the reference is null before retrieving
  its value, it's still possible to try to retrieve the value
  when the reference is null under a multithreading and stress
  test environment.
  
  APAR PM06960 is currently targeted for inclusion in Service
  Level (Fix Pack) 1.0.1.3 of WebSphere Application Server v7
  Feature Pack for Service Component Architecture (SCA) Refresh
  Pack. 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

  WAS SCA FEATURE

• Fixed component ID

  5724J0854

Applicable component levels

• R700 PSY

     UP