Web servers and servlet engines are at the heart of many Internet/intranet/extranet applications, serving Web pages to the accessing networks. In designing a Web delivery system, we partition our architectures such that servers are optimized for their specific functions. Web servers typically deliver static content, while passing dynamic content requests to servlet engines that support the JSP presentation logic. The JSP layer, in turn, may make method calls to the EJB business logic layer. This software layering approach facilitates efficient modification of a single layer, while retaining the other layers, thus simplifying application maintenance.
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