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https://issues.apache.org/jira/browse/MYFACES-2013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713832#action_12713832
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Leonardo Uribe commented on MYFACES-2013:
-----------------------------------------

The error comes from MYFACES-1613. Caption code was added twice, without notice 
it. The solution is remove the line causing it and redirect in proper way 
HtmlTableRendererBase.renderCaptionFacet

> h:dataTable renders caption facet twice on ear projects
> -------------------------------------------------------
>
>                 Key: MYFACES-2013
>                 URL: https://issues.apache.org/jira/browse/MYFACES-2013
>             Project: MyFaces Core
>          Issue Type: Bug
>          Components: General
>    Affects Versions: 1.2.4
>         Environment: Ubuntu Linux 8.04, Glassfish V2 server, Netbeans IDE 6.1
>            Reporter: Juan Montoya
>             Fix For: 1.2.7-SNAPSHOT
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> This bug does not happen on standalone war projects but in .ear projects 
> which contain a war project using MyFaces.
> JSP code like this:
> [...]
> <%...@taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
> [...]
> <h:dataTable...>
>   <f:facet name="caption">
>     <h:outputText value="this is the caption"/>
>   </f:facet>
>   <h:column>
>     <f:facet name="header">
>       <h:outputText value="this is a header"/>
>     </f:facet>
>     [...]
>   </h:column>
>   [...]
> </h:dataTable>
> Renders the caption facet twice:
>   <table><caption/><thead/><caption/><tbody/></table>
> There must be only one <caption> element; firefox and safari gracefully 
> ignore the second caption, but in Internet Explorer and Opera, the caption 
> appears twice.
> The following link includes a sample netbeans application and a list of the 
> libraries used.
> http://rapidshare.com/files/154981138/dblcaption.tar.gz.html

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