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Hi, probably you are speaking about javax.servlet.http.HttpServletActivationListener. From the APIs:
Objects that are bound to a session may listen to container events notifying them that sessions will be passivated and that session will be activated. A container that migrates session between VMs or persists sessions is required to notify all attributes bound to sessions implementing HttpSessionActivationListener.
So, I don't seem you need to specify it in the DD. [ June 28, 2007: Message edited by: Mirko Bonasorte ]