PM77840: NOCLASSDEFFOUNDERROR CAUSED BY A CONCURRENTMODIFICATIONEXCEPTION

8.5.0.2: WebSphere Application Server V8.5 Fix Pack 2
8.0.0.6: WebSphere Application Server V8.0 Fix Pack 6
7.0.0.29: WebSphere Application Server V7.0 Fix Pack 29
8.0.0.7: WebSphere Application Server V8.0 Fix Pack 7
8.0.0.8: WebSphere Application Server V8.0 Fix Pack 8
7.0.0.31: WebSphere Application Server V7.0 Fix Pack 31
7.0.0.33: WebSphere Application Server V7.0 Fix Pack 33
8.0.0.9: WebSphere Application Server V8.0 Fix Pack 9
7.0.0.35: WebSphere Application Server V7.0 Fix Pack 35
8.0.0.10: WebSphere Application Server V8.0 Fix Pack 10
7.0.0.37: WebSphere Application Server V7.0 Fix Pack 37
8.0.0.11: WebSphere Application Server V8.0 Fix Pack 11
7.0.0.39: WebSphere Application Server V7.0 Fix Pack 39
8.0.0.12: WebSphere Application Server V8.0 Fix Pack 12
7.0.0.41: WebSphere Application Server V7.0 Fix Pack 41
8.0.0.13: WebSphere Application Server V8.0 Fix Pack 13
7.0.0.43: WebSphere Application Server V7.0 Fix Pack 43
8.0.0.14: WebSphere Application Server V8.0 Fix Pack 14
7.0.0.45: WebSphere Application Server V7.0 Fix Pack 45
8.0.0.15: WebSphere Application Server V8.0 Fix Pack 15
7.0.0.29: Java SDK 1.6 SR13 FP2 Cumulative Fix for WebSphere Application Server
7.0.0.45: Java SDK 1.6 SR16 FP60 Cumulative Fix for WebSphere Application Server
7.0.0.31: Java SDK 1.6 SR15 Cumulative Fix for WebSphere Application Server
7.0.0.35: Java SDK 1.6 SR16 FP1 Cumulative Fix for WebSphere Application Server
7.0.0.37: Java SDK 1.6 SR16 FP3 Cumulative Fix for WebSphere Application Server
7.0.0.39: Java SDK 1.6 SR16 FP7 Cumulative Fix for WebSphere Application Server
7.0.0.41: Java SDK 1.6 SR16 FP20 Cumulative Fix for WebSphere Application Server
7.0.0.43: Java SDK 1.6 SR16 FP41 Cumulative Fix for WebSphere Application Server

APAR status

• Closed as program error.

Error description

• NoClassDefFoundError caused by a ConcurrentModificationException
  
  ************************
  
  the EJB timer requires multiple modules, a java:comp
  jta-data-source, and concurrency while the app is starting
  (either inbound requests or scheduler).
  
  *************************
  From Trace:
  ************************
  
  com.ibm.ws.webcontainer.servlet.ServletWrapper init SRVE0100E:
  Uncaught
  init() exception created by servlet ApplicationStartNotifier in
  application JWFFPS: java.util.ConcurrentModificationException
   at
  java.util.AbstractList$SimpleListIterator.next(AbstractList.java
  :64)
   at
  com.ibm.ws.jpa.management.JPAPUnitInfo.transformClass(JPAPUnitIn
  fo.java:
  1868)
   at
  com.ibm.ws.classloader.CompoundClassLoader._defineClass(Compound
  ClassLoa
  der.java:769)
   at
  com.ibm.ws.classloader.CompoundClassLoader.localFindClass(Compou
  ndClassL
  oader.java:689)
   at
  com.ibm.ws.classloader.CompoundClassLoader.loadClass(CompoundCla
  ssLoader
  .java:512)
  *********************************
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  IBM WebSphere Application Server users of   *
  *                  container-managed Java Persistence API      *
  *                  (JPA)                                       *
  ****************************************************************
  * PROBLEM DESCRIPTION: Concurrency during application start    *
  *                      can result in                           *
  *                      ConcurrentModificationException from    *
  *                      class loading.                          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Container-managed JPA allows persistence providers to register
  class transformers that intercept class loads.  The JPA
  container maintains a list of class transformers, but the list
  is not thread-safe, so concurrent class loads can cause a
  ConcurrentModificationException.
  

Problem conclusion

• The list of class transformers was changd to be thread-safe.
  
  The fix for this APAR is currently targeted for inclusion in
  fix packs 7.0.0.29, 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:

  PM77878 PM85781

Fix information

• Fixed component name

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels

• R700 PSY

     UP

• R800 PSY

     UP

• R850 PSY

     UP