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PODuplicate id when dynamically adding new component to JSF component tree
 

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    <p>Using JSF 2.1, Mojarra 2.1.3, Glassfish 3.1.1, and PrimeFaces 3.3.1</p> <p>I'm trying to handle processing field level security in JSF, on the preRenderView event, and having issues when needing to add a dynamic component to the JSF component tree. On first render, everything is fine and field level security is processed. After any sort of update, however, Mojarra complains about a duplicate id even though, through printing to the console, my add code is only running once per update.</p> <p>It appears as if Mojarra isn't clearing the component tree for postbacks and thus each subsequent rendered update adds an additional version of the component to the tree.</p> <p>Thanks for any help anyone can provide. Here's some dumbed-down sample code. On commandButton click the error is thrown.</p> <p>index.xhtml:</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core" xmlns:p="http://primefaces.org/ui" &gt; &lt;f:event listener="#{lifeCycle.event}" type="preRenderView" /&gt; &lt;h:body&gt; &lt;h:form id="form" prependId="false"&gt; &lt;h:panelGroup id="testPanel"&gt; &lt;h:inputText id="viewSec" value="viewSec node"/&gt;&lt;br/&gt; &lt;/h:panelGroup&gt; &lt;p:commandButton update="testPanel"/&gt; &lt;/h:form&gt; &lt;/h:body&gt; &lt;/html&gt; </code></pre> <p>LifeCycle.java:</p> <pre><code>package com.dynamic.test; import java.io.Serializable; import java.util.List; import javax.faces.bean.ManagedBean; import javax.faces.bean.RequestScoped; import javax.faces.component.UIComponent; import javax.faces.component.UIViewRoot; import javax.faces.component.html.HtmlOutputText; import javax.faces.component.visit.VisitContext; import javax.faces.context.FacesContext; import javax.faces.event.ComponentSystemEvent; @ManagedBean @RequestScoped public class LifeCycle implements Serializable { public void event(ComponentSystemEvent event){ FacesContext facesContext = FacesContext.getCurrentInstance(); UIViewRoot root = facesContext.getViewRoot(); NodeInspector visitCallback = new NodeInspector(); root.visitTree(VisitContext.createVisitContext(FacesContext.getCurrentInstance()), visitCallback); List&lt;UIComponent&gt; securityEnabledComponents = visitCallback.getSecurityEnabledComponents(); for (UIComponent securityEnabledComponent : securityEnabledComponents) { if(securityEnabledComponent.getClientId().equals("viewSec")){ List&lt;UIComponent&gt; childList = securityEnabledComponent.getParent().getChildren(); int targetPosition = securityEnabledComponent.getParent().getChildren().indexOf(securityEnabledComponent); HtmlOutputText outputTextComponent = new HtmlOutputText(); outputTextComponent.setId(securityEnabledComponent.getId()); outputTextComponent.setValue(securityEnabledComponent.getAttributes().get("value")); childList.set(targetPosition, outputTextComponent); } } } } </code></pre> <p>NodeInspector.java</p> <pre><code>package com.dynamic.test; import java.util.ArrayList; import java.util.List; import javax.faces.component.UIComponent; import javax.faces.component.visit.VisitCallback; import javax.faces.component.visit.VisitContext; import javax.faces.component.visit.VisitResult; import javax.faces.context.FacesContext; public class NodeInspector implements VisitCallback { private List&lt;UIComponent&gt; securityEnabledComponents = new ArrayList&lt;UIComponent&gt;(); FacesContext facesContext = FacesContext.getCurrentInstance(); @Override public VisitResult visit(final VisitContext context, final UIComponent target) { if(target.getClientId().equals("viewSec")){ securityEnabledComponents.add(target); } return VisitResult.ACCEPT; } public List&lt;UIComponent&gt; getSecurityEnabledComponents() { return securityEnabledComponents; } } </code></pre> <p>Error:</p> <pre><code>SEVERE: JSF1007: Duplicate component ID viewSec found in view. ... +id: j_idt2 type: &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; +id: j_idt3 type: javax.faces.component.UIOutput@17098e7 +id: form type: javax.faces.component.html.HtmlForm@14677de +id: testPanel type: javax.faces.component.html.HtmlPanelGroup@167ab25 +id: viewSec &lt;=============== type: javax.faces.component.html.HtmlOutputText@14a3d2e +id: viewSec &lt;=============== type: javax.faces.component.html.HtmlOutputText@f6a607 +id: j_idt4 type: &lt;br/&gt; +id: j_idt5 type: org.primefaces.component.commandbutton.CommandButton@1380fc5 +id: j_idt6 type: &lt;/html&gt;... SEVERE: Error Rendering View[/index.xhtml] java.lang.IllegalStateException: Component ID viewSec has already been found in the view. at com.sun.faces.util.Util.checkIdUniqueness(Util.java:821)... </code></pre>
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    1. COThis morning I just figured out what was causing my issue - the version of Mojarra I was running on has a TON of bugs, related to modifying the tree dynamically, that have since been mostly solved by more recent versions ([see bug report here](http://java.net/jira/browse/JAVASERVERFACES-1826)). In the process of fixing the bugs, they seemed to have come across the same issue I did. Modifying the tree causes tons of orphaned nodes to be left sitting around. These nodes are not actually in the rendered HTML but id uniqueness checked none the less.
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    2. COYou should post this comment as an answer. It's useful to know.
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