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https://issues.apache.org/jira/browse/MYFACES-2583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12840535#action_12840535
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Ganesh Jung commented on MYFACES-2583:
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This is what I call fast! Thank you, Jakob!

> f:ajax cannot retrieve clientId from component
> ----------------------------------------------
>
>                 Key: MYFACES-2583
>                 URL: https://issues.apache.org/jira/browse/MYFACES-2583
>             Project: MyFaces Core
>          Issue Type: Bug
>          Components: JSR-314
>    Affects Versions: 2.0.0-beta-2
>         Environment: JSF
>            Reporter: Ganesh Jung
>            Assignee: Jakob Korherr
>             Fix For: 2.0.0-beta-3
>
>         Attachments: MyFaces_Test.war
>
>
> This code:
>               <h:form id="myForm">
>               <h:inputText value="#{myBean.test}">
>                               <f:ajax 
> render="#{myBean.bindingMyTest.clientId}" event="keyup"/> 
>               </h:inputText>
>               <h:inputText id="myText" value="#{myBean.test}" 
> binding="#{myBean.bindingMyTest}" />
>               </h:form>
> produces java.lang.ClassCastException: java.lang.String cannot be cast to 
> java.util.Collection
> while this works:
>               <h:form id="myForm">
>               <h:inputText value="#{myBean.test}">
>                               <f:ajax render="myForm:myText" event="keyup"/> 
>               </h:inputText>
>               <h:inputText id="myText" value="#{myBean.test}"/>
>               </h:form>
> On Mojarra both work fine. My guess is here's some problem with the special 
> lifecycle of bindings properties.

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