PM37328: ORG.APACHE.COMMONS.LOGGING.LOGFACTORY RETAINING A REFERENCE TO AN SCACLASSLOADER CAUSING OOM

6.1.0.47: WebSphere Application Server V6.1 Fix Pack 47

APAR status

• Closed as program error.

Error description

• Product Release and Version Information: WebSphere Application
  Server Base Version 7.0 with Feature Pack for Service Component
  Architecture (SCA) V1.0.1.
  
  Problem Description:
  
  The org.apache.commons.logging.LogFactory is retaining a
  reference to an SCAClassLoader which results in an out of
  memory error.
  

Local fix

• Local Fix/Work Around: None
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server with Feature Pack for Web            *
  *                  Services and Feature Pack for Service       *
  *                  Component Architecture (SCA)                *
  ****************************************************************
  * PROBLEM DESCRIPTION: Out of memory error caused by           *
  *                      org.apache.commons.logging.LogFactory   *
  *                      retaining a reference to an             *
  *                      SCAClassLoader.                         *
  ****************************************************************
  *                  * RECOMMENDATION:  Install a fixpack containi
  ****************************************************************
  An out of memory error might occur when WebSphere Application
  Server is used in conjunction with Feature Pack for Service
  Component Architecture (SCA).  The heapdumps show that
  org.apache.commons.logging.LogFactory is retaining a reference
  to an SCAClassLoader.
  The problem occurs because LogFactory contains a strong
  reference to the classLoader in its internal cache.  The cache
  is not cleared when the application stops, and the strong
  reference prevents the cache from being freed by the
  garbage collector.  This results in a memory leak.
  

Problem conclusion

• The LogFactory code is corrected to use weak references to the
  classloader in its internal cache.  This allows garbage
  collection of the cache to proceed when the application is
  stopped.
  
  The fix for this APAR is currently targeted for inclusion in
  fix pack 6.1.0.41.  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 is sysrouted FROM one or more of the following:

  PM36842

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WEBSERVIC FEATU

• Fixed component ID

  5724J0850

Applicable component levels

• R610 PSY

     UP