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PI10209: CONCURRENTMODIFICATIONEXCEPTION BY DYNACACHE WHILE MULTIPLE THREADS ARE CREATING THE CACHE INSTANCES AT THE SAME TIME.

Fixes are available

7.0.0.33: WebSphere Application Server V7.0 Fix Pack 33
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
7.0.0.35: WebSphere Application Server V7.0 Fix Pack 35
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
7.0.0.37: WebSphere Application Server V7.0 Fix Pack 37
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
7.0.0.39: WebSphere Application Server V7.0 Fix Pack 39
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
7.0.0.41: WebSphere Application Server V7.0 Fix Pack 41
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
7.0.0.43: WebSphere Application Server V7.0 Fix Pack 43
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
7.0.0.45: WebSphere Application Server V7.0 Fix Pack 45
8.0.0.15: WebSphere Application Server V8.0 Fix Pack 15
7.0.0.45: Java SDK 1.6 SR16 FP60 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
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14

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APAR status

  • Closed as program error.

Error description

  • ConcurrentModificationException by Dynacache while multiple
    threads are creating the cache instances at the same time.
    The following exceptions are observed in Systemout and FFDC
    ******
    DYNA0021E: Unable to initialize cache unit
    
    WsServerImpl  E   WSVR0009E: Error
    occurred during startup
    com.ibm.ws.exception.RuntimeError: Object Cache Service was not
    initialized sucessful. Exception: null
    at
    com.ibm.ws.cache.ObjectCacheServiceImpl.start(ObjectCacheService
    Impl.jav
    a:152)
    at
    com.ibm.ws.runtime.component.ContainerHelper.startComponents(Con
    tainerHe
    lper.java:538)
    at
    com.ibm.ws.runtime.component.ContainerImpl.startComponents(Conta
    inerImpl
    .java:627)
    at
    com.ibm.ws.runtime.component.ContainerImpl.start(ContainerImpl.j
    ava:618)
    ****
    
    
    FFDC
    Exception:java.util.ConcurrentModificationException
    SourceId:com.ibm.ws.cache.ObjectCacheServiceImpl.start
    ProbeId:237
    Reporter:com.ibm.ws.cache.ObjectCacheServiceImpl@39563956
    java.util.ConcurrentModificationException
    at
    java.util.HashMap$AbstractMapIterator.checkConcurrentMod(HashMap
    .java:19
    3)
    at
    java.util.HashMap$AbstractMapIterator.makeNext(HashMap.java:198)
    at java.util.HashMap$KeyIterator.next(HashMap.java:271)
    at
    com.ibm.ws.cache.CacheServiceImpl.getObjectCacheInstanceNames(Ca
    cheServi
    ceImpl.java:893)
    at
    com.ibm.ws.cache.ObjectCacheServiceImpl.start(ObjectCacheService
    Impl.jav
    *********
    WebSphere Application Server V7.0.
    Distributed operating Systems
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server using dynamic cache with multiple    *
    *                  cache instances.                            *
    ****************************************************************
    * PROBLEM DESCRIPTION: The application server may fail to      *
    *                      start when an error occurs creating     *
    *                      cache instances.                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The dynacache service maintains a collection of cache instance
    configurations.  Access to the collection is not thread safe
    and could result in a ConcurrentModificationException if
    multiple threads are creating cache instances simultaneously.
    

Problem conclusion

  • The collection that houses the cache instance configurations
    has been changed to a thread safe collection.
    
    The fix for this APAR is currently targeted for inclusion in
    fix packs 7.0.0.33, 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 number

    PI10209

  • 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

    2014-01-23

  • Closed date

    2014-02-27

  • Last modified date

    2014-02-27

  • 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

  • R800 PSY

       UP

  • R850 PSY

       UP



Document information

More support for: WebSphere Application Server
General

Software version: 7.0

Reference #: PI10209

Modified date: 27 February 2014