EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g

Abstract

EJB (Enterprise JavaBeans) 3.0 entity beans is a commonly used database persistence technology. EJB 3.0 has simplified the development of EJBs with an annotations-based API that does not require remote/local interfaces, home/local home interfaces, or deployment descriptors. Developing entity EJBs requires an application server and a relational database, and optionally a Java EE IDE to simplify the process of development. The objective of the JSR-000220 Enterprise JavaBeans 3.0 specification (http://jcp.org/aboutJava/communityprocess/final/jsr220/index.html) is to improve the EJB architecture by reducing its complexity from the developer's point of view. EJB 3.0 has introduced some new features, which include support for metadata annotations, default values for configuration, simplified access to environment variables, simplified session and entity beans, interceptors, enhanced support for checked exceptions, and elimination of callback interfaces.