PM53049: Transactions fail with a NullPointerException, when getSession is called before initializing on a local data grid.

APAR status

• Closed as program error.

Error description

• When multiple threads call getSession on a local data grid, a
  transaction can fail with a NullPointerException when session
  commit or rollback is invoked.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Users of WebSphere eXtreme Scale who use a  *
  *                  local data grid and getSession to           *
  *                  initialize the data grid instance.          *
  ****************************************************************
  * PROBLEM DESCRIPTION: A field in an ObjectGrid instance is    *
  *                      not initialized early enough.  This     *
  *                      field is needed for transaction         *
  *                      operations.                             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When ObjectGrid.getSession() is called by multiple threads and
  one of the getSession() invocations initializes the data grid,
  transactions on the returned sessions do not complete with
  the following exception.  Other sessions that are created
  after the necessary field is initialized do not have this
  issue.
  com.ibm.websphere.objectgrid.TransactionException:
  java.lang.NullPointerException
  at
  com.ibm.ws.objectgrid.SessionImpl.rollback(SessionImpl.java:1923
  )
  Caused by: java.lang.NullPointerException
  at
  com.ibm.ws.objectgrid.SessionImpl.rollback(SessionImpl.java:1896
  )
  

Problem conclusion

• The data grid initialization code was updated to make sure
  that the necessary field in the ObjectGrid instance is
  initialized earlier to avoid the NullPointerException exception.
  

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

  XD EXTREME SCAL

• Fixed component ID

  5724J3402

Applicable component levels

• R610 PSY

     UP