EJB's

EJB's are heavy weight components with all the different contract/convention. EJB entity beans provides you persistence with CMP and BMP with CMPs the container is taking care of all the services (Transaction, Security, Concurrency) and in BMP the bean itself needs to manage the services.

http://www.linkedin.com/groups/EJB-entity-beans-Hibernate-dao-50472.S.120316355