Book Image

EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g

By : Deepak Vohra, Deepak Vohra
Book Image

EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g

By: Deepak Vohra, Deepak Vohra

Overview of this book

EJB (Enterprise JavaBeans) 3.0 is a commonly used database persistence technology in Java EE applications. EJB 3.0 has simplified the development of EJBs with an annotations-based API that eliminates the use of remote/local interfaces, home/local home interfaces, and deployment descriptors. A number of other books are available on EJB 3.0, but none covers EJB 3.0 support in Oracle Fusion Middleware 11g, which is one of the leaders in the application server market.This is the first book that covers all aspects of EJB 3.0 database persistence development using Oracle Fusion Middleware technology. It covers all the best practices for database persistence ensuring that your applications are easily maintainable. Leaving theory behind, this book uses real-world examples to guide you in building your own EJB 3.0 applications that are well integrated with commonly used Java EE frameworks.The book gets going by discussing the new features in the EJB 3.0 specification. As some readers may still be using EJB 2.0, the book explains how to convert your EJB 2.0 entity beans to EJB 3.0. It then goes on to discuss using EJB 3.0 database persistence with JDeveloper, WebLogic Server, and Enterprise Pack for Eclipse, the main Java EE components of Oracle Fusion Middleware 11g. The book also covers EJB 3.0 relationships and integrating EJB 3.0 relationships with JSF user interfaces. EJB 3.0 database persistence with some of the commonly used frameworks such as ADF Faces, AJAX, and Web Services is also discussed in the book. It uses the integrated WebLogic Server 11g in some of the chapters and the standalone WebLogic Server in other chapters. While JDeveloper is the primary Java IDE used in the book, one of the chapters is based on the Oracle Enterprise Pack for Eclipse.By the time you reach the end of this book, you will be well-versed with developing EJB 3.0 applications using the different Java EE components of Oracle Fusion Middleware 11g.
Table of Contents (15 chapters)
EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g
About the Author
About the Reviewers

Creating an EJB 3.0 entity bean

In this section we create an EJB 3.0 entity bean. Select the JPA project node in Project Explorer and select File | New. In the New window, select JPA | Entity and click on Next.

In the New JPA Entity window, we define an Entity class. Select the project in which the Entity class is to be created. Select the Source folder, specify a Java package, and specify a Class name. In Inheritance, select Entity. Click on Next, as shown in the following screenshot:

In the Entity Properties window, the Entity Name, Table Name, and Entity Fields are specified. Entity fields may be added with the Add button. Click on Finish. An EJB 3.0 entity bean class gets added to the JPA project. The Entity class Catalog is shown with code, which we shall discuss next:

The EJB 3.0 entity class

Unlike EJB 2.0, in EJB 3.0 entity beans are Plain Old Java Objects (POJOs). Entity bean mappings are defined using annotations, which were introduced in JDK 5.0 and are in the javax.persistence package...