The Big Picture
Each of the J2EE technologies is intended for a specific purpose and ideally suited for solving specific types of challenges.
Figure 9-1 provides a 50,000-foot view of how the various technologies fit together.
Figure 9-1. The J2EE big picture
The main point to note is that each technology is designed to be used in a specific tier, and each tier is designed to be very focused on the role that it plays in the overall J2EE application development paradigm. This limits the roles individual components can play, even though surpassing these limits may be feasible from a technology perspective.
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