In order to add a bean to a container, files associated with the bean are packaged in a .jar file. Files include the bean class, home, remote, local home and local interfaces and the deployment descriptor. Beans need to be deployed into containers before be accessed by clients through containers as distributed components.
During deployment, EJB object and EJB home are automatically created (by J2EE servers) for entity and session beans.
The EJB object, which acts as a request interceptor, implements the bean's component interface and provides a reference to an invoked bean. The EJB home, which is an EJB object factory, implements the bean's home interface and is responsible for creating, removing, and locating enterprise beans.
As message-driven beans respond only to asynchronous messages, they do not have component or home interfaces and so have no corresponding EJB object or EJB home.
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