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These application servers provide a usable runtime environment in which components can execute and provide the needed middleware services (such as resource pooling and security) for reliability and scalability. But unfortunately, up until now there has not been a definition of what a middletier component really is. Because of this, each application server has been providing component services in a non-uniform, proprietary way. This means that once you bet on an application server, your code is locked into that vendor’s solution.

We do not cover JavaMail in this book. Connectors. Connectors make J2EE well suited to integrate with mainframe systems running high-end transactions (such as those deployed with IBM’s CICS), as well as Enterprise Resource Planning (ERP) systems. Connectors will be included in a future release of J2EE. The Extensible Markup Language (XML). 1 and JSP) depend on XML as a meta-markup language for describing content. We cover XML in Appendix C, and we cover how XML and EJB are related in Appendix D.

By separating interface from implementation, you can vary a component’s proprietary logic without changing any client code. For example, you can plug in a different implementation that performs the same task more efficiently. This is possible because the actual implementation is not needed at compile time—only the interface is needed. Hence, there is no specific implementation tied to the client code. 4. The Java language supports interface/implementation separation at a syntactic level via the interface keyword and class keyword.

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Wiley - Mastering Enterprise Java Beans


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