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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 life cycle management and state management. In this article, you will see how an initial database application is extended and used for both local and remotely 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.

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Corresponding openejb-jar.xml defines Geronimo specific features of EJBs. It has both EJB information and their relationships. In addition it gives a link to the database pool of the application. Entity Beans in the application are dependant dependent on this pool. Also note that the final part of this file defines a 1-N Container Managed Relation (CMR) between Customer and Account Entity Beans.

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Banking remote application client can be run by issuing the java -jar bankclient.jar ant run-client in a command prompt. Use an existing account number in the database to view it's balance. Modification of account balance can be done by providing a numeric value to the balance field and using the Update button.

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