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Explain the JEE Architecture and System Requirements
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Nonfunctional requirements are specific. The ability to support a specified number of concurrent users, expected transaction throughput, maximum allowable response time, supported data growth rate, and acceptable end-to-end latency are important nonfunctional requirements that must be satisfied if the application is to be successful. These JEE application server solutions have evolved to a point wherein nonfunctional requirements are addressed by built-in feature sets from these application infrastructure services. This allows application developers to focus their efforts on building functionality or business services. These applications use basic JEE services that are already built into servers sold by multiple vendors. For example, multithreading, concurrency handling, connection pooling, state/session synchronization, container-managed transactions, and persistence are feature sets of the application servers that address the nonfunctional requirements. The nonfunctional requirements supported by JEE are divided into six categories:
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Concurrent connections, data growth rates, user-population growth rates, storage capacity, compute capacity, performance characteristics, and response-time requirements can be solved by connection pooling and application server clustering. Application-level security is handled by JEE via deployment descriptors, protection domains as well as network security, OS security, and database security. Extensibility of the application; flexibility of the configuration; and the adaptive nature of the compute, storage, and network resources to changing demands from the application and application infrastructure are supported by JEE. JEE provides multiplatform support (all UNIX, Win XP), cross-certification of application infrastructure solutions, multiple client devices, and back-end connectivity to legacy resources. Change management, problem management, asset management, and network/systems management. Platform reliability, application infrastructure stability, and uptime requirements.
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4: Applicability of JEE Technology
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A JEE application is usually assembled from two different types of modules: enterprise beans and web components. Both of these modules are reusable; therefore, new applications can be built from preexisting enterprise beans and components. The modules are also portable, so the application that comprises them will be able to run on any JEE server conforming to the specifications. To build these modules, you will first need to consider designing the application using a modeling tool before using a development tool to implement code. The remainder of this section will take a look at each of these areas before moving into a discussion of what makes up a JEE application and the development phases of a JEE project.
Modeling Tools
Modeling is the visual process used for constructing and documenting the design and structure of an application. The model is an outline of the application, showing the interdependencies and relationships among the components and subsystems. Tools are available to facilitate this process, allowing you to show a high-level view of many objects. The Unified Modeling Language (UML) was created to unify the many proprietary and incompatible modeling languages that existed. The use of modeling tools makes sense with the increasing complexity of Enterprise Java applications and components. However, learning to model comes from experience and from sharing knowledge about best practices and bad practices. Today, modeling involves the use and reuse of patterns. A pattern is commonly defined as a three-part rule that expresses a relationship between a certain context, a problem, and a solution. In other words, a pattern can represent a solution to a recurring problem or issue.
Development Tools
To be productive with technology such as JEE, analysts and programmers will inevitably need visual development tools for building JEE applications and components, e.g., Eclipse. When constructing a JEE application, a developer must not only create Java code but also build an archive file to house the classes and other supporting files, including XML deployment descriptors and reference resolutions. This archive must then be deployed to a server and tested. These sets of tasks will be repeated several times over before the application is finally ready to be deployed to a production environment. All of these tasks typically need to be coordinated among multiple developers. The tools available at this time are still maturing, and tool vendors frequently release newer versions of tools to ease the development process.
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