IBM Support

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

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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 number

    PH21407

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-01-24

  • Closed date

    2020-04-20

  • Last modified date

    2020-04-20

  • 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

[{"Line of Business":{"code":"LOB36","label":"IBM Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"900"}]

Document Information

Modified date:
14 September 2020