PH66634: A NullPointerException occurs in MCWrapper.getConnection when the system attempts to reuse a previously aborted connection.

APAR status

• Closed as program error.

Error description

• A NullPointerException occurs in MCWrapper.getConnection() when
  the system tries to reuse a managed connection (MCWrapper) that
  has already been aborted and set to null.
  
  2025-04-23T09:14:56.121+0100] 00000164 IncidentImpl  I
  FFDC1015I: An FFDC Incident has been created:
  "java.lang.NullPointerException
  com.ibm.ejs.j2c.MCWrapper.getConnection 901" at
  ffdc_25.04.23_09.14.55.0.log
  
  VEDOC.PRODUCT.PRODUCTINTERNALVERIFICATIONHELPER.10:
  com.daimler.vedoc.appfw.core.exception.VeDocException:
  java.lang.NullPointerException	at
  Loader.java.lang.NullPointerException
  	at
  com.ibm.ws.rsadapter.jdbc.WSJdbcConnection.beginTransactionIfNec
  essary(WSJdbcConnection.java:326)
  	at
  com.ibm.ws.rsadapter.jdbc.WSJdbcResultSet.next(WSJdbcResultSet.j
  ava:2253)
  	at org.hibernate.loader.Loader.doQuery(Loader.java:853)
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server                                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: NullPointerException is thrown in       *
  *                      getConnection.                          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A NullPointerException occurs in MCWrapper.getConnection() when
  the system tries to reuse a managed connection (MCWrapper) that
  has already been aborted and set to null.
  

Problem conclusion

• The fix introduces a validation step before attempting to reuse
  a connection from MCWrapper. It checks for the aborted and do-
  not-reuse-mcw flags. If either flag is true, the connection is
  non reusable. Instead of proceeding with a null reference and
  risking a NullPointerException, the MCWrapper is now marked as
  stale, and a ResourceException is thrown.
  
  The fix for this APAR is targeted for inclusion in fix pack
  9.0.5.25. 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