PI07476: CONCURRENTMODIFICATIONEXCEPTION IN NAMING CLASS WHEN ENABLING TRACE.

8.0.0.9: WebSphere Application Server V8.0 Fix Pack 9
8.5.5.3: WebSphere Application Server V8.5.5 Fix Pack 3
8.5.5.4: WebSphere Application Server V8.5.5 Fix Pack 4
8.0.0.10: WebSphere Application Server V8.0 Fix Pack 10
8.5.5.5: WebSphere Application Server V8.5.5 Fix Pack 5
8.5.5.6: WebSphere Application Server V8.5.5 Fix Pack 6
8.0.0.11: WebSphere Application Server V8.0 Fix Pack 11
8.5.5.7: WebSphere Application Server V8.5.5 Fix Pack 7
8.5.5.8: WebSphere Application Server V8.5.5 Fix Pack 8
8.0.0.12: WebSphere Application Server V8.0 Fix Pack 12
8.5.5.9: WebSphere Application Server V8.5.5 Fix Pack 9
8.5.5.10: WebSphere Application Server V8.5.5 Fix Pack 10
8.5.5.11: WebSphere Application Server V8.5.5 Fix Pack 11
8.0.0.13: WebSphere Application Server V8.0 Fix Pack 13
8.5.5.12: WebSphere Application Server V8.5.5 Fix Pack 12
8.0.0.14: WebSphere Application Server V8.0 Fix Pack 14
8.5.5.13: WebSphere Application Server V8.5.5 Fix Pack 13
8.0.0.15: WebSphere Application Server V8.0 Fix Pack 15
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
8.5.5.15: WebSphere Application Server V8.5.5 Fix Pack 15
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
8.5.5.17: WebSphere Application Server V8.5.5 Fix Pack 17
8.5.5.20: WebSphere Application Server V8.5.5.20
8.5.5.18: WebSphere Application Server V8.5.5 Fix Pack 18
8.5.5.19: WebSphere Application Server V8.5.5 Fix Pack 19
8.5.5.16: WebSphere Application Server V8.5.5 Fix Pack 16

APAR status

• Closed as program error.

Error description

• When enabling naming trace, a ConcurrentModificationException
  is thrown with the following stacktrace.
  
  Caused by: java.util.ConcurrentModificationException
  at java.util.HashMap$AbstractMapIterator.checkConcurrentMod
  (HashMap.java:193)
  at java.util.HashMap$AbstractMapIterator.makeNext
  (HashMap.java:198)
  at java.util.HashMap$EntryIterator.next(HashMap.java:259)
  at java.util.HashMap$EntryIterator.next(HashMap.java:252)
  at java.util.AbstractMap.hashCode(AbstractMap.java:436)
  at com.ibm.ws.naming.util.CommonHelpers.mapToTerseString
  (CommonHelpers.java:679)
  
  ....
  at com.ibm.ws.naming.ipbase.NameSpace.traceDebugInfo
  (NameSpace.java:2323)
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server                                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: A ConcurrentModificationException       *
  *                      might be thrown when naming trace is    *
  *                      enabled.                                *
  ****************************************************************
  * RECOMMENDATION:  Install a fix pack containing this APAR.    *
  ****************************************************************
  Some trace code runs the "toString" or similar method on
  objects in the code.  When this is done on some Collections,
  an iterator is created internally by the collection object.
  If another thead is updating that object concurrently, the
  exception can occur.
  

Problem conclusion

• Trace code is modified to catch and tolerate the  exception.
  
  The fix for this APAR is currently targeted for inclusion in
  fix packs 8.0.0.9 and 8.5.5.3.  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:

Fix information

• Fixed component name

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels

• R700 PSY

     UP

• R850 PSY

     UP