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From "Filip Hanik" <m...@filip.net>
Subject RE: tomct-replication Exception: java.util.ConcurrentModificationException
Date Tue, 15 Apr 2003 18:30:03 GMT
hi Dennis and others,
yes, we have seen this before, and it has been fixed in the version
published on the website

http://cvs.apache.org/~fhanik/

let me know if you still have problems

Filip

> -----Original Message-----
> From: Dennis Muhlestein [mailto:dennis@zserve.com]
> Sent: Tuesday, April 15, 2003 9:34 AM
> To: tomcat-user@jakarta.apache.org
> Subject: Re: tomct-replication Exception:
> java.util.ConcurrentModificationException
>
>
> Thank you for the response.  I guess my point in posting this, is that
> the exception occurs in the tomcat-replication code, not in my code.
> Was wondering if Filip had come accross anything like this.
>
> -Dennis
>
> Andy Eastham wrote:
>
> >Dennis,
> >
> >This is a feature of the collections framework.  If you create
> an iterator
> >on a collection, then modify the underlying collection object,
> you get this
> >exception.
> >
> >I've had it when I've mistakenly used an iterator to loop over a
> collection
> >and tried to delete an object from the underling  collection.
> Sometimes you
> >can perform the operation on the iterator itself to avoid this.
> >
> >You should be able to redesign the code to avoid it, once you
> know why it's
> >occurring.
> >
> >Andy
> >
> >
> >
> >>-----Original Message-----
> >>From: Dennis Muhlestein [mailto:dennis@zserve.com]
> >>Sent: 15 April 2003 15:34
> >>To: tomcat-user@jakarta.apache.org
> >>Subject: tomct-replication Exception:
> >>java.util.ConcurrentModificationException
> >>
> >>
> >>We get this exception in our catalina.out file fairly often.  Any
> >>suggestions?
> >>
> >>java.util.ConcurrentModificationException
> >>         at java.util.HashMap$HashIterator.nextEntry(HashMap.java:762)
> >>         at java.util.HashMap$KeyIterator.next(HashMap.java:798)
> >>         at
> >>org.apache.catalina.cluster.mcast.McastMembership.expire(McastMemb
> >>ership.java:52)
> >>         at
> >>org.apache.catalina.cluster.mcast.McastServiceImpl.receive(McastSe
> >>rviceImpl.java:116)
> >>         at
> >>org.apache.catalina.cluster.mcast.McastServiceImpl$ReceiverThread.
> >>run(McastServiceImpl.java:140)
> >>
> >>
> >>Using Filip's tomcat-replication.jar/tomcat 4.1.18/blackdown-jdk-1.4.1
> >>
> >>-Thanks
> >>Dennis
> >>
> >>
> >>---------------------------------------------------------------------
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> >>
> >>
> >>
> >>
> >
> >
> >
> >
> >
> >
>
>
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>
>


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