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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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Understanding Tiers and Components

The 3-tier model splits an application down so that business logic resides in the middle of the 3 tiers. This is often called the middle tier, business tier, or EJB tier. Throughout this section, this tier will be referred to as the business tier. The first tier has the role of providing the interface between the user and the application. Depending on your specific architecture, this can be known as the client tier or presentation tier. Throughout this section, the term presentation tier will be used to define this client-centric tier.

Most of the code written by J2EE application developers resides in the presentation and business tiers. The next two sections explore these tiers. You will see that different ...

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