EJB in two minutes: a refresher

• More detail here
  
• You have your EJB server, container, EJBs and clients.
• Entity Beans (think persistence), Session Beans (stateful/stateless), Mesage Driven Beans (needs no interface)

EJBs have:

• Home Interface: provides methods for locating, creating, and removing instances of EJB classes, home object is implementation
• Remote Interface: is the client facing interface, it has all the business methods.
• Enterprise Java Bean: Is in the container result of deploying home and remote interface.
• Create home interface by extending EJBHome
• Create Remote interface by extending EJBObject
• Define primary key object.
• Create your Entity Bean implementing EntityBean

Typical lifecycle:

• Locate home object, create or find remote object from home object, apply business methods on remote object