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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=27315

java.util.ConcurrentModificationException

           Summary: java.util.ConcurrentModificationException
           Product: Tomcat 4
           Version: 4.1.30
          Platform: PC
        OS/Version: Other
            Status: NEW
          Severity: Major
          Priority: Other
         Component: Connector:Coyote HTTP/1.1
        AssignedTo: [EMAIL PROTECTED]
        ReportedBy: [EMAIL PROTECTED]


Hello,

I have recently upgraded from Tomcat 4.1.29 to 4.1.30, primarily to avoid bug 
#24970.  Since the upgraded, everything seems to work OK, but intermittently I 
get the following error:

java.util.ConcurrentModificationException
        at java.util.AbstractList$Itr.checkForComodification
(AbstractList.java:448)
        at java.util.AbstractList$Itr.next(AbstractList.java:419)
        at java.util.AbstractCollection.remove(AbstractCollection.java:254)
        at org.apache.coyote.RequestGroupInfo.removeRequestProcessor
(RequestGroupInfo.java:17)
        at org.apache.coyote.RequestInfo.setGlobalProcessor(RequestInfo.java:96)
        at org.apache.coyote.http11.Http11Protocol$MXPoolListener.threadEnd
(Http11Protocol.java:620)
        at org.apache.tomcat.util.threads.ThreadPool.removeThread
(ThreadPool.java:279)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run
(ThreadPool.java:727)
        at java.lang.Thread.run(Thread.java:534)

The system seems to operate OK even with this issue.  I have not made any 
change to my codebase since the upgrade from 4.1.29 to 4.1.30.

I would be grateful if anyone could shed any light on this issue.

Kind regards,

Minh Tran

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