Editing EJB (section)

====Stateful Session Beans====
If the client invokes method calls against the same bean stub, the calls are always tunneled to the same bean instance in the container. So, all field variables in the bean instance retain their values as long as the client application retains the bean stub (or reference for a local client). In a web application, the servlet (or JSP page) caches the bean stub as an attribute in the HttpSession object. It is very important to note that the stateful session bean class must implement the Serializable interface so that the container can serialize them and store them to preserve the state information when the bean instances are not in use.

=====Features=====
* bound to a client with a client specific state (conversational state)
* can be passivated, if not in transaction
* methods cannot be published as web service