IBM Support

JR52097: YOU RECEIVE A CONCURRENTMODIFICATIONEXCEPTION WHEN SERVICE RESULTS ARE CACHED

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APAR status

  • Closed as program error.

Error description

  • When many services run with service result caching enabled, a
    ConcurrentModificationException might occur in the system log
    file with the following message:
    
    CWLLG0594E: An exception occurred while initializing the
    runnable thread. Error:
    java.util.ConcurrentModificationException
    The exception stack trace looks similar to the following
    exception stack trace:
    
    java.util.ConcurrentModificationException
     at java.util.LinkedHashMap$AbstractMapIterator.
      checkConcurrentMod(LinkedHashMap.java:136)
     at java.util.LinkedHashMap$AbstractMapIterator.makeNext
      (LinkedHashMap.java:141)
     at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.
      java:188)
     at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.
      java:180)
     at com.ibm.bpm.server.service.cache.ServiceResultCache.
      removeExpiredResults(ServiceResultCache.java:176)
     at com.ibm.bpm.server.service.cache.ServiceResultCache.
      add(ServiceResultCache.java:87)
     at com.lombardisoftware.server.ejb.workflow.
      EJBWorkflowManagerBean.doResumeWorkflowEngine
      (EJBWorkflowManagerBean.java:1599)
     at com.lombardisoftware.server.ejb.workflow.
      EJBWorkflowManagerBean.runProcess(EJBWorkflowManagerBean.
      java:555)
     at com.lombardisoftware.server.ejb.workflow.
      EJSRemoteStatefulEJBWorkflowManager_82478d70.
      runProcess(Unknown Source)
     at com.lombardisoftware.server.ejb.workflow.
      _EJBWorkflowManagerInterface_Stub.runProcess
      (_EJBWorkflowManagerInterface_Stub.java:772)
     at com.ibm.bpm.rest.impl.service.ServiceRunner$Service.
      runService(ServiceRunner.java:704)
     at com.ibm.bpm.rest.impl.service.StartActionHandler.
      handleAction(StartActionHandler.java:219)
     at com.ibm.bpm.rest.impl.service.ServiceResource.
      postServiceActions(ServiceResource.java:409)
    

Local fix

Problem summary

  • An iterator removes expired entries from the LinkedHashMap,
    which is used for the service result cache. You see a
    ConcurrentModificationException when the next action on the
    iterator is done because entries are removed from the map using
    the remove method of the map instead of using the remove method
    of the iterator. The documentation of LinkedHasMap describes
    that when using iterators the map needs to be modified using the
    iterator methods.
    

Problem conclusion

  • A fix is available for IBM BPM V8.5.0.1 that removes the expired
    entries correctly from the service result cache.
    
    On Fix Central (http://www.ibm.com/support/fixcentral), search
    for JR52097:
    
    1. Select IBM Business Process Manager with your edition from
      the product selector, the installed version to the fix pack
      level, and your platform, and then click Continue.
    
    2. Select APAR or SPR, enter JR52097, and click Continue.
    
    When you download fix packages, ensure that you also download
    the readme file for each fix. Review each readme file for
    additional installation instructions and information about the
    fix.
    

Temporary fix

  • Not applicable
    

Comments

APAR Information

  • APAR number

    JR52097

  • Reported component name

    BPM STANDARD

  • Reported component ID

    5725C9500

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-12-17

  • Closed date

    2015-02-16

  • Last modified date

    2015-02-16

  • 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

    BPM STANDARD

  • Fixed component ID

    5725C9500

Applicable component levels

  • R850 PSY

       UP

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Document Information

Modified date:
16 February 2015