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Enterprise JavaBeans, Second Edition
book

Enterprise JavaBeans, Second Edition

by Richard Monson-Haefel
September 2001
Intermediate to advanced content levelIntermediate to advanced
489 pages
14h 44m
English
O'Reilly Media, Inc.
Content preview from Enterprise JavaBeans, Second Edition

Component Models

The term “component model” has many different interpretations. Enterprise JavaBeans specifies a server-side component model. Using a set of classes and interfaces from the javax.ejb packages, developers can create, assemble, and deploy components that conform to the EJB specification.

The original JavaBeans™, the java.beans package in the core Java API, is also a component model, but it’s not a server-side component model like EJB. In fact, other than sharing the name “JavaBeans,” these two component models are completely unrelated. A lot of the literature has referred to EJB as an extension of the original JavaBeans, but this is a misrepresentation. Other than the shared name, and the fact that they are both Java component models, the two APIs serve very different purposes. EJB does not extend or use the original JavaBeans component model.

The original JavaBeans (the java.beans package) is intended to be used for intraprocess purposes, while EJB (the javax.ejb package) is designed to be used for interprocess components. In other words, the original JavaBeans was not intended for distributed components. JavaBeans can be used to solve a variety of problems, but is primarily used to build clients by assembling visual (GUI) and nonvisual widgets. It’s an excellent component model, possibly the best component model for intraprocess development ever devised, but it’s not a server-side component model. EJB is designed to address issues involved with managing distributed ...

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Publisher Resources

ISBN: 1565928695Supplemental ContentCatalog PageErrata