Architecting the System
Architecting consists of deciding what tiers are needed for the application, what services are required at each tier, and how the application logic will be spread across different tiers. As you learned on Day 15, “Understanding J2EE Architecture,” the J2EE architecture is designed for multitier applications. In a multitier architecture, the business logic can be split into more than one layer. In the sample application, logic is partitioned into the business logic tier and the presentation logic tier. The user interface is partitioned into the client tier and the presentation tier. The application-persistent data is stored in the EIS tier. Figure 21.3 shows the architecture of the system.
Figure 21.3. Architecture diagram. ...
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