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Enterprise Java Beans has been one of the corner stones of the J2EE specification. As a J2EE 1.4 certified application server, Apache Geronimo supports EJB's extensively with the help of OpenEJB EJB Container. Although it is possible to use standard Java objects to contain your business logic and business data, using EJBs addresses many of the issues of using simple Java objects, such as scalability, lifecycle management and state management. In this article, you will see how an initial database application is extended and used for both local and remotely reffered referred application clients for an Enterprise Java Beans back end. The application uses inbuilt Apache Derby as its database. Use this article to learn how to simplify your enterprise application development process.

Banking application has two types of application clients namely "Banking Remote Application" and "Banking Web Application". Each of these clients demonstrate how to refer Enterprise Java Beans in remote and local interfaces respectively. Both these clients are reffering referring a common business layer which has been implemented with the help of Session and Entity Beans. Stateless Session Beans are acting as the business service interface between business entities and application clients. All the business entities of the application layer are implemented with the CMP & BMP Entity Beans. Relations between CMP entities are managed as Container Managed Relations.

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