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Typically, thin-client, multi-tiered applications are difficult to write because they involve complex programming for handling transaction management, multithreading, database connection pooling, and other low-level details. The component-based and platform-independent JEE architecture makes JEE applications desirable and easier to develop because business logic is organized into reusable components, and the JEE server provides underlying services in the form of a container for every component type.
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Components are installed in their containers during deployment. Containers are the interface between a component and the platform-specific functionality supporting that component. Before a web component can be executed, it must first be assembled into a JEE application and then deployed into its container. The process of assembly involves specifying container settings for each component within the JEE application as well as for the application itself. These settings customize the underlying support provided by the JEE server, including services such as security,
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Explain the JEE Architecture and System Requirements
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transaction management, Java Naming and Directory Interface (JNDI) lookups, and remote connectivity. Following are some examples:
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n The JEE security model allows configuration of a web component or enterprise
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bean so that only authorized users can access system resources.
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n The JEE transaction model provides for relationships among methods that
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make up a single transaction; therefore, all methods in one transaction are treated as a single unit of work.
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n JNDI lookup services provide an interface to multiple naming and directory
services in the enterprise, e.g., LDAP, allowing application components to access naming and directory services. The JEE remote connectivity model manages the communication between clients and enterprise beans. After an enterprise bean is created, methods are invoked on it by the client as if it were in the same virtual machine. Because the JEE architecture provides configurable services, application components within the same JEE application can behave differently, depending on where they are deployed. For instance, an enterprise bean can have security settings, allowing it a certain level of access to database data in one production environment and a different level of database access in another production environment. Containers also manage services such as enterprise bean and servlet life cycles, database connection resource pooling, data persistence, and access to the JEE platform APIs. Although data persistence is a nonconfigurable service, the JEE architecture allows you to include code in your enterprise bean implementation to override container-managed persistence (CMP) when more control is desired than the default provided by CMP. For example, bean-managed persistence (BMP) may be used to implement your own finder methods or to create a customized database cache.
Container Types
The deployment process installs JEE application components in the JEE containers, as shown in Figure 4-5. An EJB container manages the execution of all enterprise beans for a single JEE application. Enterprise beans and their accompanying containers run on the JEE server. A web container manages the execution of all JSP and servlet components for a single JEE application. Web components and their accompanying containers run on the JEE server. An application client container manages the execution of all application client components for a single JEE application. Application clients and their accompanying containers run on the client machine. An applet container is the web browser and Java plug-in combination that runs on the client machine.
4: Applicability of JEE Technology
FIGURE 4-5
Application components and JEE containers
EXERCISE 4-1 JEE Architecture and the Nonfunctional Requirements of a System
Question Describe how JEE architecture affects the nonfunctional requirements of a system. Answer The success of a software development project is dependent on many factors in addition to software functionality. It is important that you differentiate between functional and nonfunctional requirements. Nonfunctional requirements include the environment, platforms, tools, and networking components within which an application is implemented; they include quality-related issues such as scalability, speed of execution and response time, ease of installation, maintainability, and reliability. These nonfunctional requirements affect the capabilities of the functional requirements. The JEE architect actively needs to account for all requirements, functional and nonfunctional, and needs to include all aspects of the project, including the packaging, installation, deployment, and maintenance of a software solution. Architects are often tasked with providing infrastructure design and layout for applications based on JEE technology. The JEE infrastructure provided by compliant and certified application servers typically offers techniques that meet nonfunctional requirements such as scalability, compatibility, and so on.
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