J2EE provides entity EJBs as a mechanism for mapping Java objects to database tables. In CMP the J2EE system itself generates the SQL necessary to create the EJBs from the database and to update the database to reflect changes made to the EJBs. The generic term for a framework that synchronizes program objects with relational database data in this manner is an Object-Relational Mapping (ORM) framework .
J2EE and the EJB model have its supporters as well as its detractors, but almost everyone agrees that it is mainly suitable for large-scale distributed applications. To get the benefits of ORM for non-J2EE applications, programmers typically adopt an alternative ORM framework, the most popular of which is Hibernate (http://www.hibernate.org).
Database stored programs and ORM are not necessarily a perfect fit. Gavin King— the creator of Hibernate—was quoted as saying:
Stored procedures are essentially a nonrelational view of a relational database ... my view, currently, is that the goal of an object-relational mapping tool should be to map between tables and objects, not between objects and “some other stuff.”[*]
It’s true that programmers who are building applications that make widespread use of stored procedures will get less benefit from Hibernate than those working with native SQL; in particular, Hibernate cannot auto-generate stored procedure calls, so the programmer needs to configure Hibernate with every stored procedure call that might ...