memcached-session-manager detects session modification as you describe it.
It's a custom session manager that keeps sessions (additionally) in
memcached:
http:// code.google.com/p/memcached-session-manager

Cheers,
Martin



Thomas Andraschko wrote:
> 
> Thanks for your answer.
> Yep that works but it isn't really nice if you are working with managed
> beans from JSF or other DI containers.
> Does other Servlet containers support this kind of replication or is it
> really the only way to put/remove the object to/from the session map?
> It is possible to develop a valve or interceptor to check specified
> entries in the session map and replicate them again? (sorry, i don't know
> the architecture very well)
> 
> 
> --- Mark Thomas <ma...@apache.org> schrieb am Mo, 14.2.2011:
> 
>> Von: Mark Thomas <ma...@apache.org>
>> Betreff: Re: Replicate session-object after values in object has been
>> changed
>> An: "Tomcat Users List" <users@tomcat.apache.org>
>> Datum: Montag, 14. Februar, 2011 19:09 Uhr
>> On 14/02/2011 15:57, Thomas
>> Andraschko wrote:
>> > Is it possible that Tomcat will automatically check
>> the SessionMap entries after each request if any value in a
>> entry has been changed? 
>> No.
>> 
>> Tomcat adding or removing an object from the session will
>> trigger
>> replication. Modifying the object directly will not trigger
>> replication.
>> 
>> You can try re-adding the object to the session. That
>> should trigger
>> replication.
>> 
>> Mark
>> 
>> 
>> 
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> 
> 
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