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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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Revisiting the J2EE Platform

You learned a lot about enterprise computing yesterday. You learned specifically about how business needs force the evolution of application architectures; today, most applications are distributed across multiple machines. This approach, the n-tier model, gives rise to different ways of writing and structuring applications. Units of functionality— components—provide modularity that allow multiple developers to work more easily on different parts of the application. Use of a component framework also allows developers to apply third-party components to speed development. These loosely-coupled components may run as an application on a desktop client, within a Web server, or even on a server that connects to a legacy ...

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