Integrate an XML presentation layer in the J2EE layered architecture
Tutorial Details:
Today's organizations' rapid moves to e-business bring new demands on defining flexible systems architectures. Systems need to be powerful, scalable, robust, and, most of all, capable of meeting new business demands. With that in mind, although more and more organizations are adopting a multitier, Java 2 Platform, Enterprise Edition (J2EE)-based application server architecture, they rely on HTML for the presentation layer. This prevents them from fully benefiting from the flexibility the distributed, multitier J2EE framework can offer. XML's Web publishing capabilities are key to solving this architectural shortfall.
This article proposes a replacement for the current HTML-based J2EE architecture presentation layer with a dynamic XML content layer. Through a case study, we'll see an XML-aware, open source application server within a fully operational end-to-end solution. At the heart of the case study resides Cocoon, a servlet from Apache that provides a pluggable Java presentation framework used to present XML content in a variety of formats, on demand.
The situation J2EE defines a standard for developing multitier enterprise applications. J2EE simplifies enterprise applications by basing them on standardized, modular components, by providing a complete set of services (persistence, security, transactions, and so on) to those components, and by handling many details of application behavior declaratively, without complex programming. However, the architecture's presentation layer is primarily HTML-based, thus limiting the target audience largely to Web browsers. Tomorrow's audience will be much broader, what with a variety of new devices about to revolutionize how we send and receive information. As such, it's imperative to decouple content from presentation logic and become independent of our intended audience's devices. XML is the solution.
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