PM16243: JAVA.UTIL.CONCURRENTMODIFICATIONEXCEPTION OCCURS USING SDOS IN THE SCA FEATURE PACK. PROBLEM ONLY HAPPENS ON SOLARIS.

APAR status

• Closed as program error.

Error description

• The following exception occurs when using SDOs in the
  Feature Pack for Service Component Architecture ( SCA ):
  
  java.util.ConcurrentModificationException
  at java.util.AbstractList$Itr.checkForComodification
  (AbstractList.java:372)
  at
  java.util.AbstractList$Itr.next(AbstractList.java:343)
  ...
  
  Problem occurs only on the Solaris operating system.
  

Local fix

• Run application on a non-Solaris operating system.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Users of IBM WebSphere Application Server   *
  *                  v7 Feature Pack for Service Component       *
  *                  Architecture (SCA) Refresh Pack v1.0.1 and  *
  *                  WebSphere Process Server v7.0               *
  ****************************************************************
  * PROBLEM DESCRIPTION: ConcurrentModificationException         *
  *                      thrown when traversing a data object    *
  *                      list                                    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When you traverse a data object list using a for-loop or
  iterator, sometimes you get a ConcurrentModificationException
  even in a single threaded environment in the Solaris multi-core
  JVM
  

Problem conclusion

• The usage of "<= Integer.MAX_VALUE" in the for loop of the SDO
  implementation would be optimized to "< Integer.MAX_VALUE+1"
  by the server core JIT in the Solaris JVM. This would result
  in the upper limit overflow and terminate the for loop
  prematurely and cause the data object list not to be fully
  populated. So later on, traversing the list would result in
  the ConcurrentModificationException. This is now corrected.
  
  APAR PM16243 is currently targeted for inclusion in Service
  Level (Fix Pack) 1.0.1.7 of WebSphere Application Server v7
  Feature Pack for Service Component Architecture (SCA) Refresh
  Pack. 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

  WAS SCA FEATURE

• Fixed component ID

  5724J0854

Applicable component levels

• R700 PSY

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