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Sams Teach Yourself J2EE™ in 21 Days by Peter Roxburgh, Andy Longshaw, Debbie Law, Dan Haywood, Martin Bond

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Q & A

Q1:There is much material available on application design and architecture. Why should I use patterns?
A1: Patterns are mined from concrete examples of design and architectural elements that have been used and proven in delivered systems. A pattern is only a pattern when it has been identified in multiple existing designs or architectures. As such, a pattern is more than just an opinion.
Q2:What effect do J2EE patterns have on the systemic qualities of a design, such as scalability and availability?
A2: Correctly applied, J2EE patterns will improve one or more of the systemic qualities of a design. As an example, consider the Value Object pattern. The primary purpose of using a Value Object between client and server is to reduce network ...

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