IBM Support

PI53170: CLASSLOADER LEAK CAUSES OUTOFMEMORYERROR WHEN APPLICATIONS REPEATEDLY RESTARTED WITHOUT RESTARTING APPLICATION SERVER

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APAR status

  • Closed as program error.

Error description

  • When an application is repeatedly stopped and started without
    restarting the application server, a classloader leak may occur
    and lead to a Java heap OutOfMemoryError.
    
    When the classloader leak occurs, the Javacores that are
    produced by the OutOfMemoryError will be very large with many
    sets of duplicate classes being loaded.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server V8.5.5.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: In some instances, the session          *
    *                      invalidator may maintain a reference    *
    *                      to an application classloader on        *
    *                      application restart.                    *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The Session Manager invalidation thread may maintain a
    reference to an existing application classloader when the
    application is restarted. These classloaders can build up in
    memory, contributing to an OutOfMemory error.
    

Problem conclusion

  • Changes were made to the Session Invalidator thread to ensure
    more consistent cleanup of references to application
    classloaders.
    
    The fix for this APAR is currently targeted for inclusion in
    fix pack 8.5.5.10.  Please refer to the Recommended Updates
    page for delivery information:
    http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI53170

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2015-11-25

  • Closed date

    2016-02-19

  • Last modified date

    2016-02-19

  • 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

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.5","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
28 April 2022