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POHow to avoid namespace collision when including identical XHTML JSF 2.0 files
 

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  1. POHow to avoid namespace collision when including identical XHTML JSF 2.0 files
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    <p>In my JSF 2.0 project, I get a name-space collision when I include two identical XHTML files in a single parent XHTML file. My goal is to create a dashboard of identical controls on a single page, with each control representing a separate context.</p> <p>For example, in the following JSF file, called <code>parent.xhtml</code> (say), I include two "dashboard" facelets:</p> <pre><code>&lt;ui:define name="body"&gt; &lt;p:panel id="ONE" &gt; &lt;ui:include src="raceboardunit.xhtml"/&gt; &lt;/p:panel&gt; &lt;p:panel id="TWO" &gt; &lt;ui:include src="raceboardunit.xhtml"/&gt; &lt;/p:panel&gt; &lt;/ui:define&gt; </code></pre> <p>To be simple, say the child facelet "raceboardunit.xhtml" is the following:</p> <pre><code>&lt;ui:composition xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core" xmlns:p="http://primefaces.prime.com.tr/ui"&gt; &lt;p:panel header="Dashboard" &gt; &lt;h:panelGrid columns="2"&gt; &lt;h:outputLabel value="Event" for="idEvent}" /&gt; &lt;h:outputLabel value="#raceBoardController.name}" id="idEvent" /&gt; &lt;/h:panelGrid&gt; &lt;/p:panel&gt; &lt;/ui:composition&gt; </code></pre> <p>The problem is the collision involving the output label <strong>id="idEvent"</strong>, since in the <code>parent.xhtml</code> file, the two inclusions of the child facelet have an identical named component.</p> <p>The error is reported as: <code>Component ID idEvent has already been found in the view.</code></p> <p>The reason for the error is obvious, but <em>what is the best way to include a variable number of identical components in a JSF 2.0 application that maximises code reuse</em>?</p>
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