Component interface question

Question

Is the concept "component interface" related to the business methods of the bean or to the callback methods (that inform the bean about state events) of SessionBean/EntityBean interface?
if "component interface" related to the callBack methods then how the interface with the business methods is called (in 3.0 i know it's "business interface" but what about 2.1)?
thanks in advanced

Answer 1

The component interface refers to a particular client view exposed from the bean. It contains the business methods available to the callers.
The callback methods are a separate contract between the bean class and the container. In EJB 2.x, they are expressed via strongly-typed javax.ejb interfaces that the bean class was required to implement.
In EJB 3.0, all callbacks are optional and the bean class uses annotations such as @PostConstruct to annotate the methods it wants to be called back. These methods are typically not exposed through the client (component interface) view.
--ken