Migrating EJB 2.x applications to EJB 3.0

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Tutorial: Migrating EJB 2.x applications to EJB 3.0

Enterprise JavaBeans 3.0 is a substantial change from the earlier specifications in terms of both the change in enterprise bean implementation models and in the bean location and call paradigm.

Tutorial Details:

Enterprise JavaBeans 3.0 simplifies the enterprise bean architecture and provides enhanced and more powerful features. The new specification leverages the annotations metadata facility introduced in Java 5, persistence and object-
relational mapping best practices from tools such as Hibernate and TopLink, and the Dependency Injection pattern made popular by lightweight Java frameworks such as Spring.

This article discusses possible migration strategies for moving applications written using EJB 2.1 or an earlier specification to an EJB 3.0-based architecture. The possible migration paths are evaluated from both the perspectives of design and implementation. This article does not intend to be exhaustive in illustrating the migration options.

EJB 2.1 to EJB 3.0: What has changed?
To provide a context for this article's discussion of possible migration paths, I begin by discussing the changes in the new specification in the context of each of the different bean types and then at a generic level pertinent across multiple bean types.

Session bean
In EJB 2.1 and earlier specifications, two interfaces—the home and the local, or remote, business interfaces—and the bean implementation class were required for each session bean. The home interface was required to extend the EJBHome or the EJBLocalHome interface and declare the lifecycle method, such as create(). The local, or remote, business interface was required to extend the EJBObject or the EJBLocalObject interface and declare the business methods.

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