Using validator with a variable attribute in ui:repeat

by

This is indeed specified/expected behavior. The attributes of taghandlers like <f:validateXxx> are evaluated during view build time. So they can’t refer a variable which is only available during view render time like the currently iterated variable of <ui:repeat>. It would indeed work when you use an iterator which runs during view build time like JSTL <c:forEach>. A more elaborate explanation about view build time versus view render time is given here: JSTL in JSF2 Facelets… makes sense?

You have basically the same problem as explained in detail here: How to set converter properties for each row of a datatable? It outlines various solutions in detail. One of the solutions in your particular case would be using OmniFaces <o:validator> which enables render-time evaluation of all attributes, so that you can just replace

<f:validateLongRange minimum="#{question.minimumValue}"
                     maximum="#{question.maximumValue}" />

by

<o:validator validatorId="javax.faces.LongRange" 
             minimum="#{question.minimumValue}"
             maximum="#{question.maximumValue}" />

in order to get it to work as desired.

See also:

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