Wonders of the J2EE Architecture
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by Arindam Ghosh
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J2EE Architecture Overview

J2EE architecture is essentially a distributed architecture for developing multi-tier enterprise applications. Here, applications are divided into multiple tiers: the client-tier to provide a user interface, middle-tier modules to provide services and business logic, and backend EIS to provide data management. Figure illustrates the typical J2EE environment.

Figure 3

In the above figure the client tier could consist of various client types such as web clients, Standalone Java clients, PDAs, and hand held PCs. The client can access the application from inside or outside the corporate firewall.

The middle tier provides services to the client through the web tier or the EJB tier.

The web tier is used to connect web clients or Java clients from outside the firewall to the EIS.

EJB tier is used to connect Java clients inside the firewall and web clients (through the web tier) to the EIS.

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