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XDoclet Portlet Support
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XDoclet is an open source Java code-generation tool, with an Apache-style license. The XDoclet home page is located at http://xdoclet.sourceforge.net/. You need to download and install the XDoclet 1.2 package from SourceForge (http:// sourceforge.net/projects/xdoclet/) to run the examples in this section. You also need Apache Ant 1.5 or greater (http://ant.apache.org) to run XDoclet. If you are not familiar with Ant, the online Apache Ant manual (http://ant.apache.org/manual/ index.html) is a good place to start, as is Enterprise Java Development on a Budget by Christopher M. Judd and Brian Sam-Bodden (Apress, 2004). We are going to use XDoclet to generate the portlet.xml deployment descriptor from our Java portlet class source code. Craig Walls wrote the portlet deployment descriptor integration for XDoclet, which speeds up the portlet application
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development process. To use XDoclet, you need to mark up your portlet classes with custom JavaDoc tags. XDoclet processes the JavaDoc tags and creates the deployment descriptor. The advantage is that the portlet description information belongs with the source code for the portlet class, so when you create or modify your portlet, it is easy to change the deployment descriptor information. For instance, if the class or package name changes, the generated deployment descriptor will contain the new name without any additional work on your part.
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TIP Keep the XDoclet-generated files out of source control. Re-create any generated files during the build process, because they will be derived from source files that may have changed.
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After working through the XDoclet example in this section, you should have some idea of whether using XDoclet is worth integrating into your build process. The portlet application deployment descriptor is not so complicated that automating its generation with XDoclet saves a lot of time on a normal project. For complex development projects with many portlet applications and portlet classes, standardization on XDoclet makes more sense.
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NOTE The main reason most developers use XDoclet is for generating Enterprise JavaBeans (EJB) classes. XDoclet cuts down on the number of Java classes that must be created and maintained for each EJB, so it can be a real time-saver. If you are interested in using XDoclet for EJB code generation, check out Enterprise Java Development on a Budget (Apress, 2004).
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We will show you how to set up a portlet class with XDoclet tags and then how to create an Ant build file that will generate a portlet.xml deployment descriptor. If you had more than one portlet class in your project with XDoclet tags, XDoclet will add all of them to the portlet.xml deployment descriptor.
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XDoclet Tags for Portlets
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We are going to reuse the SessionPortlet class from 4 for our XDoclet example. None of the Java code in the portlet needs to be modified for XDoclet support; we only have to add the XDoclet portlet tags to the class. The first XDoclet tag we will use for SessionPortlet will be @portlet.portlet. This tag represents one portlet class in the portlet application. There are four parameters on the @portlet.portlet tag: description, display-name, expiration-cache, and name. These parameters correspond to several of the child elements of the
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Packaging and Deployment Descriptors
<portlet> tag in the deployment descriptor. The name parameter is required, and it corresponds to the <portlet-name> tag. The name of the portlet must be unique within the web application. Here is the source code to the marked-up SessionPortlet class, with the @portlet.portlet tag. Notice that the XDoclet tag looks like the @author and @version JavaDoc tags in the source code. The @portlet.portlet tag takes up to four parameters, which can be specified on the same line as the tag name, or spread out over multiple lines. Each parameter has a name and a value for this tag, all of the values are plain text.
package com.portalbook.xdoclet; import java.io.IOException; import java.io.PrintWriter; import javax.portlet.GenericPortlet; import javax.portlet.PortletException; import javax.portlet.PortletSession; import javax.portlet.RenderRequest; import javax.portlet.RenderResponse; /** * XDoclet example portlet * * @portlet.portlet * * * * * * @portlet.supports * * * * @author Jeff Linwood and David Minter * @version 1.0 */ public class SessionPortlet extends GenericPortlet { public void doView(RenderRequest req, RenderResponse resp) throws PortletException, IOException { String newMessage = null; mime-type="text/html" modes="VIEW" description="This portlet demonstrates the use of the portlet session." display-name="Session Example" expiration-cache="0" name="SessionPortlet"
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