Utilizando o DataTable do RichFaces em uma simples página, após um reload na página sempre era retornado o seguinte erro:
Duplicate component ID '_id0:_dataTable:_id1' found in view.
Segue abaixo o código da página que causava o erro:
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
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:a4j="https://ajax4jsf.dev.java.net/ajax"
xmlns:rich="http://richfaces.ajax4jsf.org/rich">
<h:form binding="#{UserConsultPage.component}">
<rich:dataTable id="dataTable"
binding="#{UserConsultPage.dataTable}" var="item">
<rich:column>
<f:facet name="header">
<h:outputText value="Name" />
</f:facet>
<h:outputText value="#{item.name}" />
</rich:column>
<rich:column>
<f:facet name="header">
<h:outputText value="Email" />
</f:facet>
<h:outputText value="#{item.email}" />
</rich:column>
</rich:dataTable>
<h:commandButton id="btnLoad" actionListener="#{UserConsultPage.load}" />
</h:form>
</ui:composition>
A solução foi colocar id’s em todos os componentes “outputText”. Segue abaixo a página modificada:
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
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:a4j="https://ajax4jsf.dev.java.net/ajax"
xmlns:rich="http://richfaces.ajax4jsf.org/rich">
<h:form binding="#{UserConsultPage.component}">
<rich:dataTable id="dataTable"
binding="#{UserConsultPage.dataTable}" var="item">
<rich:column>
<f:facet name="header">
<h:outputText id="headerNameValue" value="Name" />
</f:facet>
<h:outputText id="nameValue" value="#{item.name}" />
</rich:column>
<rich:column>
<f:facet name="header">
<h:outputText id="headerEmailValue" value="Email" />
</f:facet>
<h:outputText id="emailValue" value="#{item.email}" />
</rich:column>
</rich:dataTable>
<h:commandButton id="btnLoad" actionListener="#{UserConsultPage.load}" />
</h:form>
</ui:composition>
