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From Dennis Muhlestein <den...@zserve.com>
Subject Re: tomct-replication Exception: java.util.ConcurrentModificationException
Date Tue, 15 Apr 2003 16:34:06 GMT
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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