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JR51071: CONCURRENTMODIFICATIONEXCEPTION WHEN EVALUATING AN XPATH EXPRESSION IN A BPEL PROCESS

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APAR status

  • Closed as program error.

Error description

  • You are running multiple process instances of the same model and
    you sporadically observe a ConcurrentModificationException when
    the BPEL engine evaluates an XPath expression. The detailed
    exception looks like the following:
    
    {2015-08-20 14:34:12,734} {} {NA} {NA} {} {} {} {} {} {} {INFO}
    {Default : 13} ComponentName [Component_ErrorDetails ]
    Message
    [Start Log of CoreMessageHandler Catch All  >>
    com.ibm.bpe.api.StandardFaultException: CWWBE0069E: The
    'bpws:getVariableData('MSG_Trigger',"TriggerKey/AdditionalKeyVal
    uePairs[Key='svcscompcode']")' object could not be selected.
    
    java.util.ConcurrentModificationException
     at java.util.HashMap$AbstractMapIterator.checkConcurrentMod
      (HashMap.java:193)
     at java.util.HashMap$AbstractMapIterator.makeNext
      (HashMap.java:198)
     at java.util.HashMap$KeyIterator.next(HashMap.java:271)
     at com.ibm.xml.xci.exec.BasicStaticContext.functionAvailable
      (BasicStaticContext.java:98)
     at com.ibm.bpe.xpathservice.impl.xci.XPathServiceImpl.
      registerFunction(XPathServiceImpl.java:455)
     at com.ibm.bpe.xpath.XPathEvaluator$ExternalExtensionFunction.
      registerAtXPathService(XPathEvaluator.java:970)
     at com.ibm.bpe.xpath.XPathEvaluator.registerExtensionFunctions
      (XPathEvaluator.java:521)
     at com.ibm.bpe.xpatheval.BasicXPathEvaluator.createXPathService
      (BasicXPathEvaluator.java:229)
     at com.ibm.bpe.xpath.XPathEvaluator.evaluateBooleanExpression
      (XPathEvaluator.java:191)
     at com.ibm.bpe.engine.BpelConditionHandler.
      evaluateTransitionCondition(BpelConditionHandler.java:505)
     at com.ibm.bpe.engine.BpelActivityStateFinished.
      continueNavigation( BpelActivityStateFinished.java:207)
     [...]
    

Local fix

Problem summary

  • XPath expressions in BPEL processes are evaluated as compiled
    expressions. The BPEL engine caches some XPath objects for
    each XPath expression. One of the XPath objects is not
    threadsafe and should not be shared across multiple execution
    threads.
    
    This issue can only occur if at least two process instances (of
    the same model) simultaneously execute the same step and
    evaluate the same XPath expression.
    

Problem conclusion

  • A fix is/will be available for IBM BPM v8.5.0.1 that corrects
    the XPath object cache.
    
    On Fix Central (http://www.ibm.com/support/fixcentral), search
    for JR51071:
    
    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 JR51071, 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

    JR51071

  • Reported component name

    BPM ADVANCED

  • Reported component ID

    5725C9400

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-08-19

  • Closed date

    2014-10-21

  • Last modified date

    2015-09-24

  • 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 ADVANCED

  • Fixed component ID

    5725C9400

Applicable component levels

  • R850 PSY

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSFTN5","label":"IBM Business Process Manager Advanced"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.5","Edition":"","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
24 September 2015