This example creates a stateless session bean. A stateless session bean is similar to a servlet without sessions. The server bean itself can have state, but doesn't remember the client from one request to the next.

The EJB 2.0 spec adds home methods to entity beans. Applications can define methods callable from the home interface. In other words, there's no need to create or find an entity bean instance just to execute an entity method. The home methods resemble static Java methods or methods in a stateless session bean.

This example creates a local counter using a session bean. Session beans have a similar API to stateless session beans, but have internal state. In other words, they're like servlets sessions.

EJB message beans are used to process message received through JMS. The message-driven bean server processes messages as they become available. The Resin-EE server calls the bean's onMessage() method with each new message.