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The JEE platform supports a simplified, component-based development model. Because it is based on the Java programming language and the Java Platform, Standard Edition (JxSE), this model offers write once, run anywhere portability, supported by any server product that conforms to the JEE standard. JEE applications have a standardized, component-based architecture that consist of components (including JSPs, EJBs, and servlets) that are bundled into modules. Because JEE applications are component based, you can easily reuse components in multiple applications, saving time and effort, and delivering applications quickly. Also, this modular development model supports clear division of labor across development, assembly and deployment of applications so that you can best leverage the skills of individuals at your site. JEE applications are for the most part distributed and multi tiered. JEE provides server-side and client-side support for enterprise applications. JEE applications present the user interface on the client (typically, a web browser), perform their business logic and other services on the application server in the middle tier, and are connected to enterprise information systems on the back end. With this architecture, functionality exists on the most appropriate platform.
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Creating an Architecture Using Distributed Services and JEE
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JEE applications are standards-based and portable. JEE defines standard APIs that all JEE-compatible vendors must support. This ensures that your JEE development is not tied to a particular vendor s tools or server, and you have your choice of tools, components, and servers. Because JEE components use standard APIs, you can develop them in any JEE development tool, develop components or purchase them from a component provider, and deploy them on any JEE-compatible server. You choose the tools, components, and server that make the most sense for you. JEE applications are scalable. JEE applications run in containers, which are part of a JEE server. The containers themselves can be designed to be scalable, so that the JEE server provider can handle scalability without any effort from the application developer. JEE applications can be easily integrated with back-end information systems. The JEE platform provides standard APIs for accessing a wide variety of enterprise information systems, including relational database management systems, e-mail systems, and CORBA systems.
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Component-based application models map easily and with flexibility to the functionality desired from an application. As the examples presented throughout this book illustrate, the JEE platform provides a variety of ways to configure the architecture of an application, depending on factors such as client types required, level of access required to data sources, and other considerations. Component-based design also simplifies application maintenance. Because components can be updated and replaced independently, new functionality can be shimmed into existing applications simply by updating selected components. Component assembly and solution deployment are especially important in JEE development.The development and production environment could be quite different. In an extensible architecture, the system structure should be stable but should also support incremental deployment of components without affecting the whole system. Components can expect the availability of standard services in the runtime environment, and they can be connected dynamically to other components providing well-defined interfaces. As a result, many application behaviors can be configured at the time of application assembly or deployment, without modification. Component developers can communicate their requirements to application deployers through specific settings stored in XML files. Tools can automate this process to expedite development.
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2: Common Architectures and Protocols
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Components help divide the labor of application development among specific skill sets, enabling each member of a development team to focus on his or her ability. For example, JSP templates can be created by graphic designers, their behavior can be coded by Java programming language coders, the business logic can be coded by domain experts, and application assembly and deployment can be affected by the appropriate team members. This division of labor also helps expedite application maintenance. For example, the user interface is the most dynamic part of many applications, particularly on the web. With the JEE platform, graphic designers can modify the look and feel of JSP-based user interface components without the need for programmer intervention.
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