Organizing Your Development Project in Java

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CHAPTER 6 Organizing Your Development Project
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Naturally, each concern is a different dimension of the project We will use advanced WTP features to create project templates and apply best practices that are helpful to organize your development work We use the generic term Web project to describe the WTP project types that are provided for J2EE development
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Web Project Types and J2EE Applications
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A project is used to develop modules such as J2EE Web applications and EJBs Typically, each module is a project, but this is not a strict requirement (see Figure 61)
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Enterprise Application Project Web Project Web Project
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leagueplanetwar Common League and Player Managment Subsystem
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Web Project leagueplanetwar Utility Project
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Utility Project
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An enterprise application project that contains a Web project and an EJB project with components for leagues and players
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For better manageability, a team can divide a large Web project into many projects Each project is used to develop a subsystem
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Figure 61 J2EE Applications and Web Projects
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For example, in a complete J2EE enterprise application, one project might consist of a Web application module for the presentation logic while another would be used to develop the EJB module for the business components In this case, the complete application consists of three projects for the modules: one for the enterprise application, one for the Web application, and one for the EJBs It is also possible to split the development of a single module into multiple projects For example, a basic module like a Web application might be built from utility modules built in other projects You will learn how to organize your projects and modules using similar patterns later in this chapter
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Web Project Types and J2EE Applications
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Web Projects
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Projects organize your source code and modules WTP provides Web projects that are sophisticated Eclipse projects that know about J2EE artifacts In addition to having basic Java project capabilities, a Web project can be used to organize J2EE artifacts into buildable, reusable units (see Figure 62)
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Simple Project
Organizes resources Manages source code
Java Project
Understands java artifacts (java, class, ) Has Java builders Runs on a Java VM
Webtools Flexible Project
Figure 62 Web Projects
Understands Web artifacts (jsp, xml, html, ) Has Web builders Understands J2EE Modules and artifacts Runs on a server
An Eclipse simple project (or general project) provides the basic infrastructure to organize and build resources The structure of a general project is very open; resources such as files and directories can be organized in any arbitrary form that makes sense for a particular purpose A JDT Java project contains Java elements such as packages, types, methods, fields, and property files for creating Java programs A Java project knows how to build and run Java programs Each Java project has a Java builder that can incrementally compile Java source files as they are edited You can change the properties of a Java project, such as the Java build path The build path is the classpath that is used for building the project There are alternative ways of structuring the sources in a Java project; examples include using a single source folder that is the project root or multiple source folders for organizing complex Java projects A WTP Web project has more than just Java code It contains sources that are used to build Web applications, EJBs, and enterprise applications A Web application can be as simple as a bunch of HTML files, or it can have servlets,
CHAPTER 6 Organizing Your Development Project
JSPs, tag libraries, and Web services These artifacts make the Web application A Web project knows how to build, publish, and run J2EE modules and artifacts on application servers Web projects have builders, validators, and code generators Builders produce standard publishable modules from complex development layouts Validators help identify and catch coding errors at development time J2EE validators are very valuable, because the sooner you find a problem the easier it is to fix In J2EE, there are many deployment descriptors that have references to Java code and each other These are interrelated in complex ways Failure to catch a problem at development time could lead to a runtime error that might be very difficult to diagnose and fix Generators create components from annotations in source code (for example, using XDoclet or JSR 175)