These tutorials, CBTs and tips are designed to help any Java professional who is looking to acquire JSR development skills to become quickly adept at both. In this three-part series, the articles describe new features available in the Java Portlet Specification (JSR ) and extensions supported by OpenPortal. Portlet Tutorial, Java Portlet, Portlet Example, Java Portlet Tutorial, What is Portlet , JSR has introduced the using of annotations for controlling things were.
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Because Windows limits the jwr path length to characters, the name of the WAR file must be less than 25 characters. After installation, the portlet is ready for use and does not require the server to be restarted. Portlets contained in WAR files have the advantage of being dynamically downloaded and installed. It uses the portlet response object to write simple output directly to the portal page.
Before you begin developing portlets, tuyorial up an environment that makes the tasks of writing, compiling, and testing portlets easier.
The portlet is provided along with the source in the IBM Portlet Samples package, which is available from the portlet catalog by searching tutorixl navcode 1WPZ. If you are not using wizards to develop portlets, the following topics describe the mechanics of building a simple portlet.
Compile your Java source files. For portlet updates, the WAR file name must be the original name of the WAR file used to install the portlet application. To facilitate deployment of portlet applications and complex portlets, you can provide a portlet configuration file that can be invoked by the XML configuration interface XMLAccess. When constructing XMLAccess scripts for use in installing standard portlets, use the following values: To do this, proceed as follows: Use this file if you use services from the Public API javadoc package.
Use yutorial file if you use services from the Public SPI javadoc package. The portal administrator can download a WAR file from the Internet and then tutkrial the portal administration interface to install the portlet to WebSphere Portal Express. For example, a portlet application might use a portlet descriptor as follows: Tutrial extensions RE branches from runtime classpath, and application extensions AEX branch from runtime extensions.
Omit this tag if the portlet does not use this feature.
Next, the portlet must be packaged in the JAR file format. The application server searches for security policy files in the location of the enterprise application archive rather than the Web application archive.
There are number of differences between the elements in this example and the corresponding Figure 8. To deploy a portlet and run it on the server, it must be packaged in the form of a Web application ARchive or WAR file. Therefore, the portal server copies was. Rational Application Developer provides wizards to help you build, test, and deploy portlets using all of the APIs and related classes and interfaces available in the portlet run time environment.
The resources can be images, JSP files, Writing 2286 portlet descriptorsand property files containing translated message text. View the basic steps for creating a simple portlet, that include writing the portlet code, compiling java source, creating the JAR file, writing the portlet descriptors, setting up the WAR file directory structure, and packaging and deploying portlets.
See Sample portlets for more information. Packaging portlet classes, resources, and descriptive information in a single file makes distribution and deployment of portlets easier. Runtime classpath RP branches from runtime classpath patches. ttuorial
Creating a simple portlet
That is, the WAR file name can be changed, but the uid must indicate the original uid used during portlet installation. The WAR file format contains the Java classes and resources that make up one or more portlets in a portlet application. Hello World provides the fewest methods required for a portlet. Standard portlets Table 2. The following shows the minimum elements required for the standard portlet deployment descriptor. This is especially useful for portlets that use messaging because these portlets have to be placed on jsf same page.
On a portal server running on Windows, installing a WAR file with a name that is more than 25 characters will result in an error. WebSphere Portal Express includes an administrative portlet for installing, uninstalling, and updating portlets. Before you package tutorkal portlet, the class files and resources must be arranged in the WAR file directory structure described here.
A particular class loader can reference other classes as long as the other classes can be loaded by the same class loader or any of its ancestors, but not its children. If you suspect a classloading problem, ensure that the required classes are in the appropriate classpath according to the classloading hierarchy. The XML configuration interface allows the portlet developer to specify places, pages, themes, skins, supported markups and clients, and other settings for a portlet application.
If you are familiar with the web. If an installed portlet application includes a class loader, the portlet application class loader is an application class loader ACx under WebSphere Portal Express. The Hello World portlet turorial an introduction to writing your first portlet.
Creating a simple portlet
In the following graphic runtime classpath patches RCP is located at the top of the hierarchy. Refer to the documentation for Rational Application Developer for complete setup instructions. The portlet information directory is not part of the public document tree of the application. Jsrr graphic illustrates where WebSphere Portal Express and portlet applications fit into the classloading hierarchy.
A portlet application exists as a structured hierarchy of directories.
If this value has tutoria been specified, specify the WAR file name of the portlet application in its place. Application class loaders AC1application class loaders AC2and application class loaders AC3 are portlet applications that branch from application extensions.
GenericPortlet which also can throw a PortletException.