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https://wso2.org/jira/browse/MASHUP-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18449#action_18449
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Keith Godwin Chapman commented on MASHUP-1048:
----------------------------------------------

Fixed in revision 20314 of branch and trunk by adding a patch to axis2. For now 
simple cloned the HashMap prior to iterating

> ConcurrentModificationException thrown occationally when stating the server 
> with JMS transport enabled
> ------------------------------------------------------------------------------------------------------
>
>                 Key: MASHUP-1048
>                 URL: https://wso2.org/jira/browse/MASHUP-1048
>             Project: WSO2 Mashup Server
>          Issue Type: Bug
>            Reporter: Keith Godwin Chapman
>            Assignee: Keith Godwin Chapman
>             Fix For: 1.5.1
>
>
> java.util.ConcurrentModificationException
>       at java.util.HashMap$HashIterator.nextEntry(HashMap.java:787)
>       at java.util.HashMap$ValueIterator.next(HashMap.java:817)
>       at org.apache.axis2.transport.jms.JMSListener.init(JMSListener.java:136)
>       at 
> org.apache.axis2.engine.ListenerManager.start(ListenerManager.java:125)
>       at 
> org.apache.axis2.engine.ListenerManager.startSystem(ListenerManager.java:140)
>       at 
> org.wso2.wsas.ServerManager.startListenerManager(ServerManager.java:191)
>       at org.wso2.wsas.MainServlet.init(MainServlet.java:195)
>       at org.wso2.mashup.transport.MainServlet.init(MainServlet.java:66)
>       at 
> org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1139)
>       at 
> org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:966)
>       at 
> org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3956)
>       at 
> org.apache.catalina.core.StandardContext.start(StandardContext.java:4230)
>       at 
> org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)
>       at 
> org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)
>       at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)
>       at 
> org.wso2.wsas.TomcatRepositoryListener.run(TomcatRepositoryListener.java:107)
>       at java.lang.Thread.run(Thread.java:595)

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