IBM Support

PM77840: NOCLASSDEFFOUNDERROR CAUSED BY A CONCURRENTMODIFICATIONEXCEPTION

Fixes are available

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

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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

Temporary fix

Comments

APAR Information

  • APAR number

    PM77840

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-11-27

  • Closed date

    2012-12-05

  • Last modified date

    2012-12-05

  • 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



Document information

More support for: WebSphere Application Server
General

Software version: 7.0

Reference #: PM77840

Modified date: 05 December 2012