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https://issues.apache.org/jira/browse/AXIS2-3958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12619458#action_12619458
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Hans G Knudsen commented on AXIS2-3958:
---------------------------------------

Hi!

Axis2 1.4 uses the 'backport' version of java.util.concurrent :

import edu.emory.mathcs.backport.java.util.concurrent.ConcurrentHashMap;

/hans

> ConcurrentModificationException in AxisConfiguration
> ----------------------------------------------------
>
>                 Key: AXIS2-3958
>                 URL: https://issues.apache.org/jira/browse/AXIS2-3958
>             Project: Axis 2.0 (Axis2)
>          Issue Type: Bug
>          Components: kernel
>         Environment: Axis2 1.4.1 RC1 artifiacts
>            Reporter: Hans G Knudsen
>             Fix For: 1.4.1
>
>         Attachments: 3958AXIS2.patch, patch.txt
>
>
> Hi!
> I ran into a :
> java.util.ConcurrentModificationException
>       at java.util.HashMap$HashIterator.nextEntry(HashMap.java:841)
>       at java.util.HashMap$KeyIterator.next(HashMap.java:877)
>       at 
> org.apache.axis2.engine.AxisConfiguration.removeServiceGroup(AxisConfiguration.java:395)
>       at org.apache.axis2.client.ServiceClient.cleanup(ServiceClient.java:813)
> In my testsetup I run 5 concurrent threads each running a series of request .
> - all creating a new ServiceClient pr request
> - reusing the same ConfigurationContext.
> /hans

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