PH21407: OUTOFMEMORY MESSAGE IS OCCURING WHEN J2CMODULE REFERENCE IS NOT FREED UP (J2CMODULE = NULL)

APAR status

• Closed as program error.

Error description

• When the Out of Memory error occurs and a heapdump is written a
  memory leak might be seen as following...
  
  com.ibm.ejs.j2c.MCWrapper @ 0x7fe3e3468 Unknown
  \ com.ibm.ws.pmi.server.modules.J2CModule @ 0x611afc690
  .\ java.util.Hashtable @ 0x611b00b48
  ..\ java.util.Hashtable$Entry[393215] @ 0x78e06b0c8
  
  com.ibm.ws.pmi.server.modules.J2CModule owns this
  hashtable which contains references to these MQ JMS objects.
  Because this J2CModule is never cleaned up it will lead to Out
  of Memory problems.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server using Datasource PMI                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: Out of Memory errors can occur when     *
  *                      PMI is enabled and interrupted threads  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The J2CModule can hold on to connection objects references
  when threads are interrupteed.   The following may be in the
  heap dump.  com.ibm.ejs.j2c.MCWrapper @ 0x7fe3e3468 Unknown
  \ com.ibm.ws.pmi.server.modules.J2CModule @ 0x611afc690
  .\ java.util.Hashtable @ 0x611b00b48
  ..\ java.util.Hashtable$Entry[393215] @ 0x78e06b0c8
  

Problem conclusion

• When threads are interrupted and PMI is enabled for
  connections, the main object reference is now set to null.
  
  The fix for this APAR is targeted for inclusion in fix pack
  8.5.5.18 and 9.0.5.5.  For more information, see
  'Recommended Updates for WebSphere Application Server':
  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

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels

• R850 PSY

     UP

• R900 PSY

     UP