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https://issues.apache.org/jira/browse/MYFACES-2895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12903800#action_12903800
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Jakob Korherr commented on MYFACES-2895:
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Just rendering an empty span with the correct id will make it work, I guess.
> Messages component cannot be updated by ajax without wrapping it
> ----------------------------------------------------------------
>
> Key: MYFACES-2895
> URL: https://issues.apache.org/jira/browse/MYFACES-2895
> Project: MyFaces Core
> Issue Type: Bug
> Components: JSR-314
> Affects Versions: 2.0.2-SNAPSHOT
> Reporter: Nick Belaevski
>
> When there are no faces messages generated, h:messages component does not
> render no HTML tags, so it cannot be updated by ajax.
> To reproduce:
> <h:messages id="messages" />
> <h:commandButton value="Invoke listener by
> type" action="#{bean.generateMessage}">
> <f:ajax render="messages" />
> </h:commandButton>
> No messages will appear. As a workaround messages component can be wrapped
> into h:panelGroup that's id will be specified in 'render':
> <h:panelGroup id="messages">
> <h:messages />
> </h:panelGroup>
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