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Supporting Perspectives for Developing J2EE Applications

Supporting Perspectives for Developing J2EE Applications. 4.1.02. Unit objectives. After completing this unit, you should be able to: Create enterprise application projects in WebSphere Studio Application Developer

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Supporting Perspectives for Developing J2EE Applications

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  1. Supporting Perspectives for Developing J2EE Applications 4.1.02

  2. Unit objectives After completing this unit, you should be able to: • Create enterprise application projects in WebSphere Studio Application Developer • Use the various Application Developer perspectives involved in developing and testing Web components • Perform the basic steps necessary to build and test a simple servlet

  3. Installed RARs EJB Module JAR file Web Module WAR file Client Module JAR file JSP Pages Servlets HTML, GIFs, etc. EJBs Client Classes J2EE Application -> Modules -> Components J2EE Application EAR file Application DD Web Services DD Web DD Web Services DD EJB DD Client DD

  4. Application Developer Project Mapping • Resources organized in a parallel structure to the J2EE application • Enterprise application project corresponds to the J2EE application itself • Manages the application.xml file • Holds the .war and .jar files which are associated with the application • Projects for each J2EE component • Web projects • EJB projects • Client application projects

  5. Building a Simple Enterprise Application • A developer uses several different perspectives when developing and testing an enterprise application • Example: building a simple servlet • Steps include: • Creating an enterprise application project and associated module projects (Web module for servlet) • Importing and creating module artifacts (create servlets, JSPs, and Web pages) • Adding enterprise application project to a server configuration (run on server) • Launching server in debug mode

  6. Creating an Enterprise Application Project • Launch the New Enterprise Application Project wizard • Designate a name for the project • Choose the Target Runtime that defines the application server type and version

  7. Manage Project Facets • Project facets allow users to add and remove functionality from a project • Select a facet to display a description • Right-click a facet and Show Constraints (the hover box)

  8. Add or Create Additional Modules • Optionally select existing module projects to add to the EAR project, or create new ones

  9. EAR Validator • Application Developer projects can have an associated validator • Invoked on save or explicitly from the context menu • The enterprise application project validator validates the following resources: • Deployment descriptor (application.xml) • All modules contained in the enterprise application • Security roles • EAR roles • EJB roles • EJB references • Resource references

  10. Web Tooling - Web Perspective (1 of 2) • The Web perspective has tools for: • Web project creation • XML, JSP, and HTML file creation, validation, editing • JavaScript editing and validation • Custom JSP tag support (based on JSP 2.0) • web.xml Editor – configuring servlets and JSPs • Servlet creation • WAR file import and export

  11. Web Tooling - Web Perspective (2 of 2) • Additional Web perspective tools: • HTTP and FTP import • FTP export (simple resource copy) to a server • Graphic editing and animation • Cascading Style Sheet (CSS) editing support • Jakarta Taglib availability • Palette View • Struts support • Link viewing, parsing and management • Integration with WebSphere Unit Test Environment • SIP Servlet creation for applications with multimedia conversations • JavaServer Faces and AJAX component layout • Portal Application and Portlets

  12. Web Perspective • View and edit Web components: Servlet, JSP and others

  13. Wizards • A series of wizards assist in creating Web assets Create a Web Page • HTML/XHTML • JSP • JSP Fragment

  14. Specify Project name Configuration EAR Membership Dynamic Web Project Wizard (1 of 3)

  15. Choose project facets Adds functionality to a project Manages project builders Configurations group facets Dynamic Web Project Wizard (2 of 3)

  16. Dynamic Web Project Wizard (3 of 3) • Set the Context root • http://hostname:port/<contextRoot>/<resource> • Content directory • Class files • Deployment descriptor • JSPs • Servlets • HTML • Other support files

  17. Create Servlet Wizard (1 of 3) • Specify Class name and Java package • Select an existing servlet class • To reuse it with different parameters or mappings • Select Annotations • To generate deployment information

  18. Create Servlet Wizard (2 of 3) • URL mappings that will invoke the servlet • http://hostname:port/<contextRoot>/<URLMapping> • Name and description • Parameters in web.xml

  19. Create Servlet Wizard (3 of 3) • Specify class modifiers, interfaces and desired method stubs

  20. Developing Servlets • Edit Java code using the Java Tooling • Can configure servlets within a Web module by editing web.xml file (deployment descriptor)

  21. Page Designer • Design View, Source View, Preview • Content Assist available (Ctrl-Space) Content Assist

  22. Run on Server • To test a Web application, choose an element to invoke via URL • For example, an HTML page, JSP, or servlet) • Select Run As > Run on Server from the context menu

  23. Servers View • Allows creation, configuration and control of servers • WebSphere Application Server 6.1 appears by default • The list of applications deployed to the server appears in a tree

  24. Test Environments and Server Configuration • WebSphere Application Server V7.0 is the default server for • enterprise applications • EJB, and Web projects • The server administrative console is use to configure the server • Projects can be run on different servers types and versions

  25. Checkpoint • What J2EE deployment descriptor configures a servlet? How can you edit this file in Application Developer? • Running an application in a test server is as easy as selecting what menu item?

  26. Checkpoint solutions • The Web Deployment Descriptor resides in the file web.xml. You can locate web.xml, or by double-click on the Deployment Descriptor entry near the top of every Web project in the Project Explorer. • Run As > Run on Server

  27. Unit summary Having completed this unit, you should be able to: • Creating enterprise applications and Web projects in Application Developer • Create a servlet in the Web perspective • Perform the basic steps necessary to build and test a simple servlet

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