Core J2EE Patterns: Best Practices and Design Strategies (2nd Edition) Review

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Core J2EE Patterns: Best Practices and Design Strategies (2nd Edition) ReviewWe software developers often get ourselves buried in learning new technologies, particularly in J2EE, there are so many things to learn, e.g., JSP, Servlet, JAAS, JSSE, JMS, JavaMail, EJB, JDBC, JDO, etc. just to name a few. With these overwhelming technologies, we often overlook the issue how to "design" "good" systems using these technologies. Knowing the technology itself is one thing, and knowing how to design with it well is another. Technologies are always advancing, it is really the design technique that is the essence or hard-core skill that a software developer should obtain.
Patterns, are such essences. They are best practices from experiences on how to design the systems/components at different levels. And Core J2EE Patterns are such collections in the J2EE context.
Even though the authors claim that these patterns are used under the J2EE context, I see most of them also application in a more general context. For example,
If a remote service is to be provided, it is good practice to use Session Facade (or Remote Facade), and it will provide service by delegating to the Application Service (or Service Layer) or Business Delegate.
To facilitate the client to access a remote service, Business Delegate can be applied to hide the remoteness, in which it will use Service Locator to look up the remote service. In this sense, Business Delegate also functions as a proxy of the remote service.
To decouple the Business Object from accessing the resources directly, Data Access Object is a good design to be applied.
To move the data between the tiers or processes, Data Transfer Object can be use.
If studying carefully, you will a lot of patterns and concepts can be applied to non-J2EE applications. And a lot of them can be traced back to the seminal work of GoF (Design Patterns). That is why I said the design skill should be essential to a developer, these techniques are correlated and inter-connected, and accumulated by experience. They are relatively stable (IMO), though the technologies are changing (rapidly).
The other good things about book, the authors not only document the best practices (patterns) of J2EE applications to learn, they also list a set of bad practices (anti-patterns) to avoid, in between, they provide a bridge, the refactoring, to go from bad to good.
Also, no pattern is an island. All patterns are related, and to form a bigger or higher level of pattern, and these higher level of patterns collaborate with each other and eventually form the whole architecture of the system, that is pattern oriented architecture. In last episode, the authors gave such an example, and they call it a micro architecture.
The authors also refer to the work of Martin Fowler's Patterns of Enterprise Application Architecture(which list patterns of more general enterprise application patterns besides J2EE) to clear out some gaps between the two books, e.g., Value Object in 1st edition really means Transfer Object, which is the same pattern listed as Data Transfer Object in Fowler's book. And Value Object is just another pattern in PEAA.
The writing style is very smooth, succinct and to the point. The pattern template is classic, with the authors chose strategies for implementation variations. The examples are probably excerpt from real projects, however, there are some errors in the code, which made me doubt that these codes were ever compiled. But, hey, it is the concept that is more important :-)Core J2EE Patterns: Best Practices and Design Strategies (2nd Edition) OverviewCompletely updated and revised, this is the second edition of the best-seller Core J2EE Patterns. J2EE has become the platform of choice for Web-centric distributed enterprise application development. Expert consultants from the Sun Java Center have identified powerful J2EE design patterns that lead to applications with superior performance, scalability, and robustness. This book brings those design patterns together, sharing Sun's best practices for development with Java Server Pages (JSP), Servlets, EJB, and other J2EE technologies. It presents a complete catalog of J2EE patterns encapsulating proven and recommended designs for common J2EE-related problems, organized into presentation tier, business tier and integration tier solutions. This second edition introduces new patterns, new refactorings, new patterns for using XML as well as new patterns for J2EE Web services. The authors also identify bad practices to be avoided. Finally, it presents an end-to-end multi-tier case study covering every stage of enterprise development.

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