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UiViewRoot - findComponent dont work  RSS feed

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I want to add a class to the input with validation error, so I have created a class that implements PhaseListener, and in the method BeforePhase I do this

So, facesContexts return me the ids with messages (validation problems), but if findcomponent return me null;

This happens only withs lists/datatables, for example, if the id = formValidacion:listaPrescripciones:0:j_id511, dont work, but if I sent formValidacion:listaPrescripciones:j_id511 give me the component!!! why??

And, if I add a 'error' class to ui component, like this

If I pass formValidacion:listaPrescripciones:j_id511, then jsf add error class to all the same components in the list/row, not for the row
Any help please?
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