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session migration servlets

Hi,

I was listening as below

In Distributed applications ServetContext is Duplicated and ServletConfig is duplicated across VMs. but HTTPSession is moved to VM when there is request.
HTTPSession one per web app where as ServetContext and ServetConfig one per VM?

If attribute objects are not serializable then make attribute object implement HttpSessionActivationListener?

 I am not clear why it is duplicated and moved? also why one per VM and one pere WEB app please advise
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