4: Applicability of JEE Technology in Java

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4: Applicability of JEE Technology
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both not null constraints and foreign key constraints, which designate that certain columns must have a value and that the value must match an existing foreign row s corresponding key value, could be considered business rules that should be known only to the business logic layer. Most product designers would agree that it is necessary to include such simple constraints in the database to maintain data integrity, changing them as the business rules evolve.
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JEE applications are made up of components: self-contained functional software units assembled into JEE applications with their related classes and files. These components communicate with other components. The JEE specification defines the following components:
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n Client components n Web components
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n Business components
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These components are written in the Java programming language and compiled in the same manner as any other program written in Java. When working with the JEE platform, the difference is that JEE components are assembled into a JEE application, where it is verified that they are well formed and compliant with the JEE specification. They are then deployed to production, where they are run and managed by the JEE server.
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A JEE application can either be web-based or non-web-based. Non-web-based components are an extension of the heretofore common client/server applications. In a non-web-based JEE application, an application client executes on the client machine. For a web-based JEE application, the web browser downloads web pages and applets to the client machine.
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Application Clients Application clients run on a client machine, providing a way for users to handle tasks such as JEE system or application administration. Usually, a graphical user interface (GUI) is created using Swing APIs; however, a commandline interface is also possible. Application clients directly access enterprise beans that run in the business tier. On the other hand, an application client can open an HTTP
Explain the JEE Architecture and System Requirements
connection establishing communication with a servlet running in the web tier if warranted by the JEE application.
Web Browsers The user s web browser downloads static or dynamic HTML, Wireless Markup Language (WML), eXtensible Markup Language (XML), or pages in other formats from the web tier. Servlets and JSPs running in the web tier provide the ability to generate dynamic web pages. Applets Web pages downloaded from the web tier can include embedded applets. These are small client applications, written in the Java programming language, which execute in the Java Virtual Machine (JVM) installed in the web browser. Client systems often need an additional Java plug-in and perhaps even a security policy file so that the applet can successfully execute in the web browser. JSPs are the preferred API for the creation of web-based client programs, where plug-ins and security policy files are not necessary on the client system. In addition, JSPs enable cleaner, more modular application designs because they provide a way to separate application programming from web-page design. This means web-page designers do not need to know Java to do their jobs. Applets running in other network-based systems such as handheld devices and cell phones are able to render WML pages generated by a JSP or servlets running on the JEE server. The WML page is delivered using the Wireless Application Protocol (WAP). The network configuration requires a gateway to translate WAP to HTTP and back again. This gateway translates the WAP request from the handheld device to an HTTP request for the JEE server, translating the HTTP server response and WML page to a WAP server response and WML page for display on the device. JavaBeans Component Architecture The client tier sometimes includes a component based on the JavaBeans component architecture for managing data flow between the application client or applet and components running on the JEE server. The JEE specification does not regard JavaBeans components as components. As will be explained later in this book, JavaBeans are not the same as EJBs. JavaBeans components have instance variables as well as get and set methods for accessing the data in those instance variables. When used in this manner that is, as a place to persist user entered data JavaBeans components tend to be simple in design and implementation. They should, however, conform to the naming and design conventions specified in the JavaBeans component architecture.
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