PH59466: JAVA.LANG.NULLPOINTEREXCEPTION AT COM.IBM.EJS.J2C.FREEPOOL.CREATEMANAGEDCONNECTIONWITHMCWRAPPER

APAR status

• Closed as program error.

Error description

• Null pointer exception in free pool create managed connection
  with Mc wrapper:
  ----------------------------
  J2CA0046E: Method createManagedConnectionWithMCWrapper caught an
  exception during creation of the ManagedConnection for resource
  jdbc/abcd, throwing ResourceAllocationException.
  
  Original exception:
  <=================================>Exception Message -> null
  java.lang.NullPointerException
  	at com.ibm.ejs.j2c.FreePool.createManagedConnectionWithMCWrapp
  er(FreePool.java:2408)
  at com.ibm.ejs.j2c.FreePool.createOrWaitForConnection(FreePool.
  java:1872)
  at com.ibm.ejs.j2c.PoolManager.reserve(PoolManager.java:3852)
  at com.ibm.ejs.j2c.PoolManager.reserve(PoolManager.java:3100)
  at com.ibm.ejs.j2c.ConnectionManager.allocateMCWrapper(Connecti
  onManager.java:1570)
  at com.ibm.ejs.j2c.ConnectionManager.allocateConnection(Connect
  ionManager.java:1049)
  at com.ibm.ws.rsadapter.jdbc.WSJdbcDataSource.getConnection(WSJ
  dbcDataSource.java:644)
  ----------------------------
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server using resource adapters.             *
  ****************************************************************
  * PROBLEM DESCRIPTION: Null pointer may occur if log writer    *
  *                      is not created before creating the      *
  *                      first managed connection.               *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  On fast multithreads systems a null point exception can occur
  if the log writer has not been created before create the first
  managed connection.  The following stack will be producted by
  the null point exception.
  J2CA0046E: Method createManagedConnectionWithMCWrapper caught
  an
  exception during creation of the ManagedConnection for resource
  jdbc/abcd, throwing ResourceAllocationException.
  Original exception:
  <=================================>Exception Message -> null
  java.lang.NullPointerException
  at com.ibm.ejs.j2c.FreePool.createManagedConnectionWithMCWrapp
  er(FreePool.java:2408)
  at com.ibm.ejs.j2c.FreePool.createOrWaitForConnection(FreePool.
  java:1872)
  at com.ibm.ejs.j2c.PoolManager.reserve(PoolManager.java:3852)
  at com.ibm.ejs.j2c.PoolManager.reserve(PoolManager.java:3100)
  

Problem conclusion

• The code that processes log writers has been moved to a thread
  safe area of the code which completes the processing of the
  log writer before the first create of a managed connection.
  
  The fix for this APAR is targeted for inclusion in fix pack
  8.5.5.26 and 9.0.5.20. For more information, see 'Recommended
  Updates  for WebSphere Application Server':
  https://www.ibm.com/support/pages/node/715553
  

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

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels