[SYNAPSE-901] Concurrency issue at Clone Mediator

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 2.1
• Fix Version/s: 3.0.0
• Component/s: Core
• Environment: Any
• Assignee: Isuru Udana
• Reporter: Malith Dhanushka
• Created: 02/Aug/12 15:06
• Updated: 02/Oct/16 14:24
• Resolved: 02/Oct/16 14:24

Description

This issue is very much identical to the issue SYNAPSE-897. Clone mediator gives following exception when messages are processed in parallel,

[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:172)
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)
Exception in thread "SynapseWorker-2" java.lang.NullPointerException
at org.apache.synapse.FaultHandler.handleFault(FaultHandler.java:78)
at org.apache.synapse.mediators.MediatorWorker.run(MediatorWorker.java:90)
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)