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EJB in two minutes: a refresher June 23, 2005

Posted by javafoo in ejb, javanotes.
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  • 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

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