PK69550: CONCURRENTMODIFICATIONEXCEPTION FROM DYNAMIC CAHCE

Java SDK 1.5 SR10 Cumulative Fix for WebSphere Application Server
6.1.0.31: Java SDK 1.5 SR11 FP1 Cumulative Fix for WebSphere Application Server
6.1.0.33: Java SDK 1.5 SR12 FP1 Cumulative Fix for WebSphere
6.1.0.29: Java SDK 1.5 SR11 Cumulative Fix for WebSphere Application Server
6.1.0.35: Java SDK 1.5 SR12 FP2 Cumulative Fix for WebSphere
6.1.0.37: Java SDK 1.5 SR12 FP3 Cumulative Fix for WebSphere
6.1.0.39: Java SDK 1.5 SR12 FP4 Cumulative Fix for WebSphere Application Server
6.1.0.41: Java SDK 1.5 SR12 FP5 Cumulative Fix for WebSphere Application Server
6.1.0.43: Java SDK 1.5 SR13 Cumulative Fix for WebSphere Application Server
6.1.0.45: Java SDK 1.5 SR14 Cumulative Fix for WebSphere Application Server
6.1.0.47: WebSphere Application Server V6.1 Fix Pack 47
6.1.0.47: Java SDK 1.5 SR16 Cumulative Fix for WebSphere Application Server

APAR status

• Closed as program error.

Error description

• ConcurrentModificationException problem ocurred in
  BatchUpdateDaemon.wake()
  
  Caused by: java.util.ConcurrentModificationException
   at java.util.HashMap$HashIterator.nextEntry(HashMap.java(Compi
   at java.util.HashMap$ValueIterator.next(HashMap.java(Compiled
   at com.ibm.ws.cache.BatchUpdateDaemon.wakeUp(BatchUpdateDaemon.
   at com.ibm.ws.cache.BatchUpdateDaemon.invalidateById(BatchUpdat
   at com.ibm.ws.cache.BatchUpdateDaemon.invalidateById(BatchUpda
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of WebSphere Application Server   *
  *                  using dynacache.                            *
  ****************************************************************
  * PROBLEM DESCRIPTION: A ConcurrentModificatinException can    *
  *                      occur during batch update processing.   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A HashMap containing cache instances was not protected from
  concurrent access from multiple threads.  While the HashMap is
  being updated it cannot be modified by another thread.  A
  ConcurrentModificationException is thrown if it is.
  

Problem conclusion

• Synchronization has been added around the HashMap to prevent
  concurrent access to the HashMap.
  
  The fix for this APAR is currently targeted for inclusion in
  fix packs 6.0.2.33 and 6.1.0.23.  Please refer to the
  Recommended Updatespage for delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  
  This problem is already fixed in the GM level of V7.0
  

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

• R60A PSY

     UP

• R60H PSY

     UP

• R60I PSY

     UP

• R60P PSY

     UP

• R60S PSY

     UP

• R60W PSY

     UP

• R60Z PSY

     UP

• R61A PSY

     UP

• R61H PSY

     UP

• R61I PSY

     UP

• R61P PSY

     UP

• R61S PSY

     UP

• R61W PSY

     UP

• R61Z PSY

     UP

• R700 PSY

     UP