PM73091: SLOW MEMORY LEAK WITH WLM OBJECT WHEN USING JAX-RPC WEB SERVICES

7.0.0.27: WebSphere Application Server V7.0 Fix Pack 27
8.5.0.2: WebSphere Application Server V8.5 Fix Pack 2
8.0.0.6: WebSphere Application Server V8.0 Fix Pack 6

APAR status

• Closed as program error.

Error description

• When you are using a JAX-RPC web services application, you will
  see memory usage grow with WorkLoad Management (WLM) related
  classes such as RuleEtiquette. But the increasing instances of
  the WLM classes were created and allocated by Web Services
  engine code WSChannelManager.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All IBM WebSphere Application Server users  *
  *                  of JAX-RPC Web Services applications        *
  ****************************************************************
  * PROBLEM DESCRIPTION: When you are using a JAX-RPC web        *
  *                      services application in a cluster       *
  *                      environment, you may see memory usage   *
  *                      grow with Work Load Management          *
  *                      related classes such as RuleEtiquette.  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  In a cluster environment, some Work Load Management classes
  are created and allocated by the Web Services engine through
  Java reflection. And in some rare circumstances, garbage
  collection does not work normally with objects created by
  reflection.
  

Problem conclusion

• To avoid the memory growth issue caused by reflection, we
  replaced reflection API calls with a regular instantiation of
  the Work Load Management classes in the Web Service engine.
  
  The fix for this APAR is currently targeted for inclusion in
  fix packs 6.1.0.47, 7.0.0.27, 8.0.0.6 and 8.5.0.2.  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:

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

  PM73293

Fix information

• Fixed component name

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels

• R61A PSY

     UP

• R61H PSY

     UP

• R61I PSY

     UP

• R61P PSY

     UP

• R61S PSY

     UP

• R61W PSY

     UP

• R61Z PSY

     UP

• R700 PSY

     UP

• R800 PSY

     UP

• R850 PSY

     UP