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

8.5.5.0-WS-BPM-IFJR51071
8.5.0.1-WS-BPM-IFJR51071
Version 8.5 Refresh Pack 6 for the IBM Business Process Manager products
Version 8.5.0 Fix Pack 2 for the IBM Business Process Manager products

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 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