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 ]