conversational state of session beans

Question

I\'m reading a book on Java EE 6 and I met with the following parts:

\"Stateless: The session bean contains no conversational state between methods, and any ins

Answer 1

Regarding the second part of the question, from the java EE 6 tutorial you can read the following:

When toUse Session Beans

Stateful session beans are appropriate if any of the following conditions are true.

• The bean’s state represents the interaction between the bean and a specific client.
• The bean needs to hold information about the client across method invocations.
• The bean mediates between the client and the other components of the application, presenting a simplified view to the client.
• Behind the scenes, the bean manages the work flow of several enterprise beans.

To improve performance, you might choose a stateless session bean if it has any of these traits.

• The bean’s state has no data for a specific client.
• In a single method invocation, the bean performs a generic task for all clients. For example, you might use a stateless session bean to send an email that confirms an online order.
• The bean implements a web service.

Java EE 6 Tutorial