hi when stateless session beans are employed they have no way to remember the previous history of the client... ie they have no idea about who the client is... sessions are used to keep track of who the client is and what is his history.. that way ejb cant be used with sessions as they cant remember the session information and they are not requested to. You can better go thru some EJB books if you need further info Head first EJB will be a superb one.