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https://issues.apache.org/jira/browse/SYNAPSE-897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Udayanga Wickramasinghe closed SYNAPSE-897.
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> Concurrency issue at Iterate Mediator
> -------------------------------------
>
> Key: SYNAPSE-897
> URL: https://issues.apache.org/jira/browse/SYNAPSE-897
> Project: Synapse
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.1
> Environment: Any
> Reporter: Malith Dhanushka
> Assignee: Udayanga Wickramasinghe
> Fix For: FUTURE
>
> Attachments: SYNAPSE-897.patch
>
>
> Iterate mediator randomly generates following exception,
> [SynapseWorker-2] ERROR MediatorWorker Unexpected error executing task/async
> inject
> java.util.EmptyStackException
> at java.util.Stack.peek(Stack.java:85)
> at
> org.apache.synapse.util.xpath.SynapseXPathVariableContext.getVariableValue(SynapseXPathVariableContext.java:157)
> at org.jaxen.ContextSupport.getVariableValue(ContextSupport.java:215)
> at org.jaxen.Context.getVariableValue(Context.java:196)
> at
> org.jaxen.expr.DefaultVariableReferenceExpr.evaluate(DefaultVariableReferenceExpr.java:103)
> at org.jaxen.expr.DefaultXPathExpr.asList(DefaultXPathExpr.java:102)
> at org.jaxen.BaseXPath.selectNodesForContext(BaseXPath.java:677)
> at org.jaxen.BaseXPath.selectNodes(BaseXPath.java:216)
> at org.jaxen.BaseXPath.evaluate(BaseXPath.java:175)
> at
> org.apache.synapse.util.xpath.SynapseXPath.stringValueOf(SynapseXPath.java:176)
> at
> org.apache.synapse.mediators.transform.HeaderMediator.mediate(HeaderMediator.java:79)
> at
> org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:60)
> at
> org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:114)
> at
> org.apache.synapse.mediators.MediatorWorker.run(MediatorWorker.java:69)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
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