J2EE Modules in Java

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J2EE Modules
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The output of the development activities are discrete J2EE components (EJBs, servlets, application clients), which are packaged with component-level deployment descriptors and assembled into J2EE modules Web application modules, EJB modules, enterprise application modules, and Java 2 Connector Architecture (J2CA) resource modules are typical J2EE modules A module contains code, resources, and deployment descriptors A J2EE module forms a stand-alone unit, which can be deployed and run on a J2EE application server Figure 63 provides an overview of the J2EE structure associated with common J2EE modules, such as Web, EJB, and EAR, as described by the specification
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WTP provides projects and wizards to help you get started quickly with different types of Web and J2EE applications You can use these wizards to create most standard Web and J2EE artifacts Additional tools will help you create, build, validate, and run your applications on servers To get started, we will review the steps involved in creating different types of applications The simple steps provided in this section will help you acquire the skills you will need to work with the examples in this book More specifically, you will learn how to create these types of projects:
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Dynamic Web project, where the output artifact is a WAR file EJB project, where the output artifact is an EJB JAR file EJB client project, where the output artifact is a JAR file that contains client-side classes for accessing an EJB module
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Web Project Types and J2EE Applications
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Enterprise application project, where the output artifact is an EAR file containing Web, EJB, and other modules
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web web-inf/ classes/ com lib/ strutsjar webxml images/ logogif indexjsp
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Classes Libraries Deployment descriptors
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ear meta-inf MyBeanclass applicationxml leaguejar newsjar leagueplanetwar consolewar
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Classes Deployment descriptors EJB modules Web modules
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Web content
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Classes Deployment descriptors EJB clientjar
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Figure 63 J2EE Modules
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Creating Web Applications
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To build a Web application you need a project that contains a Web module There are two types of Web projects: static and dynamic Static Web projects contain resources that provide static content You can use a static Web project to develop Web applications that contain many of the standard Web resources, such as HTML, images, CSS, and XML, and test them using a Web browser These projects can be deployed to a conventional Web server, such as the Apache HTTP Server, that has no J2EE capabilities Dynamic Web projects are for J2EE Web applications that contain servlets, JSPs, and filters, in addition to static content A dynamic Web project can be used as a stand-alone Web application, or it can be combined with other modules to create a J2EE enterprise application The J2EE specification defines a standard for Web application directory structure It specifies the location of static Web files, JSPs, Java class files, Java libraries, deployment descriptors, and supporting metadata The default dynamic Web project layout resembles the structure of a J2EE Web application
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CHAPTER 6 Organizing Your Development Project
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module In the workbench, you can use the New Web Project wizard to create a new Web project WTP has support for other types of project layouts and can automatically build a J2EE Web application archive (WAR) structure defined by the standard When you want to create a dynamic Web project, you will typically do the following: 1 Invoke the Dynamic Web Project wizard 2 Provide parameters such as project name and locations for Web artifacts 3 Choose a target runtime 4 Choose project facets You can try these steps by repeating the following: 1 Switch to the J2EE perspective In the Project Explorer view, right click, and invoke the New Dynamic Web Project menu item (see Figure 64)
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Figure 64 Select Wizard
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Click Next The New Dynamic Web Project wizard opens (see Figure 65)
Web Project Types and J2EE Applications
Figure 65 New Dynamic Web Project
2 Enter LeaguePlanetWebProject for the project name A dynamic Web project contains J2EE components such as JSPs and servlets It is necessary for J2EE APIs to be a part of the project classpath This is done for you automatically when you associate a J2EE server runtime with the project The runtime provides a set of libraries that will also contain JARs such as the servletjar If you switch the runtime at a later time, the classpath is also updated If your prefer not to use a runtime to provide these libraries, you can create a folder that contains the J2EE libraries and point to it as your runtime library However, this method will require you to obtain appropriate libraries for the J2EE APIs from