WebSphere Studio Application Developer Version 5 Programming Guide part 11 doc

74 WebSphere Studio Application Developer Version 5 Programming Guide Figure 3-21 CVS Repository Exploring perspective Files that exist in the repositories can be viewed by double-clicking them in a branch or version. This opens the version of the file specified in the file editor, located at the top right of the workspace.  CVS Resource History view—Displays more detailed history of each file. This view provides a list of all the revisions of a resource in the repository. From this view you can compare two revisions, replace (get sticky), or revert the corresponding workspace file to the revision (get contents), or open an editor on a revision. More details about using the CVS Repository Exploring perspective can be found in Chapter 22, “Using Concurrent Versions System” on page 701. Chapter 3. Perspectives, views, and editors 75 Install/Update perspective The Install/Update perspective (Figure 3-22) allows you to check to see whether there are updates for a product's existing features. Working with this perspective usually requires access to the Internet. Figure 3-22 Install/Update perspective The Install/Update perspective contains these views:  Install Configuration view—This view allows you to manage your workspace configuration. The Current Configuration folder shows which local installation locations are part of the workspace configuration, and which features are installed in those locations. The Configuration History folder shows a history of changes made to your workspace configuration. The Saved Configurations folder show any configurations that were preserved.  Feature Updates view—This view allows you to locate and install new features and feature updates. The view contains three standard folders. The Sites to Visit folder contains update sites pre-configured by the product you are using. The Available Updates is a built-in search results folder used for searching update sites. The My Computer folder is a file explorer that can be used to navigate to updates located in the file system.  Preview view—This view displays detailed information about the current active selection. Its content changes according to your selection. 76 WebSphere Studio Application Developer Version 5 Programming Guide For information about how to work with the Update Manager consult Appendix A, “Product installation” on page 785. Plug-in Development perspective You can develop your own Application Developer tools by using the Plug-in Development Environment (PDE). The PDE provides a set of platform extension contributions (views, editors, perspectives, etc.) that collectively streamline the process of developing plug-ins inside the Workbench. In this book we do not describe how to develop plug-ins for Application Developer. Figure 3-23 shows the Plug-in Development perspective. Figure 3-23 Plug-in Development perspective To learn more about plug-in development, refer to The Java Developer’s Guide to Eclipse (see “Other publications” on page 818 ). Chapter 3. Perspectives, views, and editors 77 Summary In this chapter we described the perspectives and views that you use with Application Developer to perform your tasks. 78 WebSphere Studio Application Developer Version 5 Programming Guide © Copyright IBM Corp. 2003. All rights reserved. 79 Chapter 4. Projects This chapter introduces the project types and some of the main terms used in Application Developer.  J2EE architecture: – EAR files –WAR files – JAR files  Projects and folders  Project types: – Simple project – Java project – Web project – Enterprise Application project – EJB project – Application Client project – Server project  Creating a new project 4 80 WebSphere Studio Application Developer Version 5 Programming Guide J2EE architecture The Java 2 Platform, Enterprise Edition (J2EE) is a robust suite of middle-ware application services for server side application development. J2EE is an extension of the Java 2 Platform, Standard Edition (J2SE). J2EE makes all Java enterprise APIs and functionality available and accessible in a well integrated fashion. This helps in simplifying complex problems in the development, deployment, and management of multi-tier, server-centric enterprise solutions. Figure 4-1 shows an overall view comprising the different J2EE technologies. Figure 4-1 J2EE architecture diagram Web containers and EJB containers Containers are basically run-time environments that provide components with specific services. For example, Web containers provide run-time support to clients by processing requests through invoking JSPs and servlets and returning results from the components to the client. Similarly, EJB containers provide J2SE Applet Container Applet Database Application Client Container Application Client J2SE RMI-IIOP JMS JDBC JNDI WebSphere Web Container JSP Servlet J2SE JTA JMS JNDI RMI-IIOP JDBC Java Mail JAF EJB Container EJB J2SE JTA JMS JNDI RMI-IIOP JDBC Java Mail JAF HTTP SSL HTTP SSL Chapter 4. Projects 81 automated support for transaction and state management of EJB components, as well as look up and security services. For additional information regarding the J2EE architecture and its technologies, consult the J2EE specification on Sun’s Web Site: http://java.sun.com/j2ee EAR files Enterprise archive (EAR) files represent a J2EE application that can be deployed in a WebSphere application server. EAR files are standard Java archive files and have the file extension .ear. EAR files also contain a deployment descriptor (an XML file) that describes the contents of the application and contains instructions for the entire application, such as security settings to be used in the run-time environment. An EAR file has the following modules (zero, one, or more of each type):  Web modules  EJB modules  Application client modules  Utility JAR files required by other modules WAR files Web archive (WAR) files contain all the components of a Web application. These components are usually:  HTML files  CSS files  JSP files  Servlets  Compiled Java files  Images JAR files The Java archive (JAR) file format allows you to store multiple files into a single archive file. Typically, a JAR file contains the class files and additional resources associated with applets and applications. EJB modules and utility modules are packaged as JAR files. 82 WebSphere Studio Application Developer Version 5 Programming Guide Projects and folders Application Developer organizes all resources into projects. A project in Application Developer is the top-level construct for organizing the different resources. It contains files as well as folders. In the Workbench you can create different kinds of projects, and they will have a different structure. Unless not specified differently, projects are created in the workspace directory of Application Developer’s installation folder. Also, the metadata is stored in the workspace directory. The .metadata directory of a workspace directory stores important information about the workspace structure, such as a project’s reference or a resource’s properties. A project is either open or closed. When a project is closed, it cannot be changed in the Workbench and it cannot be referenced from other projects. The resources of a closed project do not appear in the Workbench, but they do reside in the local file system. Application Developer’s project types Application Developer provides different project types for different tasks. Simple project A Simple project in Application Developer does not have any default folders and does not have an associated builder. The files stored inside the project are not compiled when you select to rebuild all projects in the Workbench. We will use a simple project in Chapter 6, “Developing database applications” on page 139. Java project A Java project contains Java packages and Java code as .java files and .class files. Java projects have an associated Java builder that incrementally compiles Java source files as they are changed. Java projects can be exported as JAR files or into a directory structure. Tip: Closed projects require less memory. Because they are not examined during builds, closing a project can improve the build time. Chapter 4. Projects 83 Java projects are used for stand-alone applications or to build utility JAR files for an enterprise application. A detailed example of how to create a new Java project is provided in “Creating and working with a Java project” on page 94. Enterprise Application project Enterprise Application projects contain references to the resources needed for enterprise applications and can contain a combination of Web modules, EJB modules, application client modules, and JAR files. An Enterprise Application project is deployed in the form of an EAR file. In Application Developer, the modules in an Enterprise Application project are mapped to other J2EE projects. The mapping information is stored in metadata files within the Enterprise Application project. The metadata files are used for exporting the project to an EAR file, and for running the project on the server. Application Developer mirrors the layout of a J2EE enterprise application modules with matching project types. For each type of module, a project type tailored for that purpose is provided (Figure 4-2). Figure 4-2 Application Developer projects for J2EE We will create an Enterprise Application project together with a Web project in Chapter 7, “Developing Web applications” on page 179. EAR Project EJB Project Web Project Client Project EJB DD Client DD Web DD Application DD HTML, GIF, etc. Enterprise Bean Client Class Servlet JSP EJB Module JAR file Web Module WAR file Client Module JAR file DD = Deployment Descriptor J2EE Application EAR file web.xml application.xml ejb-jar.xml Application Developer . applets and applications. EJB modules and utility modules are packaged as JAR files. 82 WebSphere Studio Application Developer Version 5 Programming Guide Projects and folders Application Developer. perspectives and views that you use with Application Developer to perform your tasks. 78 WebSphere Studio Application Developer Version 5 Programming Guide © Copyright IBM Corp. 2003. All rights. Application project – EJB project – Application Client project – Server project  Creating a new project 4 80 WebSphere Studio Application Developer Version 5 Programming Guide J2EE architecture The