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POFacelets custom component doesn't set attribute after submit
 

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  1. POFacelets custom component doesn't set attribute after submit
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    <p>I am having a problem with custom components in facelets. The first time that the page is rendered, the attributes are set properly on the component class. When a form is submitted however, the attributes are not set.</p> <p>Here is the class that I am using to test this.</p> <pre><code>public class TestEcho extends UIData { /** Logger. */ private static Log log = LogFactory.getLog(TestEcho.class); private String msg; public TestEcho() { log.debug("Constructor."); } public void encodeEnd(FacesContext context) throws IOException { ResponseWriter writer = context.getResponseWriter(); writer.startElement("div", this); writer.writeText("The value of msg is '" + msg + "'.", null); writer.endElement("div"); } public void setMsg(String msg) { log.debug("Setting msg to '" + msg + "'."); this.msg = msg; } } </code></pre> <p>The component is used in the .xhtml page like this.</p> <pre><code>&lt;h:form&gt; &lt;v:testEcho msg="hello" /&gt; &lt;h:commandButton action="#{PictureManager.trigger}" value="Click" /&gt; &lt;/h:form&gt; </code></pre> <p>When the page renders for the first time, the component renders the following html code.</p> <pre><code>&lt;div&gt;The value of msg is 'hello'.&lt;/div&gt; </code></pre> <p>When the button is clicked, it renders this.</p> <pre><code>&lt;div&gt;The value of msg is 'null'.&lt;/div&gt; </code></pre> <p>From the log, you can see that the component is constructed again, but the attribute is not set.</p> <pre><code>13:23:42,955 DEBUG [TestEcho] Constructor. 13:23:42,955 DEBUG [TestEcho] Setting msg to 'hello'. ----- Button was pressed here ----- 13:25:48,988 DEBUG [TestEcho] Constructor. 13:25:49,144 DEBUG [PictureManager] Button pressed. </code></pre> <p>From what I understand, facelets does all the wiring of attributes to components so I don't need a tag class, but I don't understand why the attribute would be set correctly the first time, but not the second time.</p>
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