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https://issues.apache.org/jira/browse/MYFACES-3547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13276996#comment-13276996
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Mike Kienenberger commented on MYFACES-3547:
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I unfortunately hit the same issue a couple of days ago. The real problem is
that validators appear to evaluate the attributes only at page build time, and
then never again.
Here is a link describing what I ended up doing to solve the problem:
http://stackoverflow.com/questions/4439850/refresh-jsf-validator-attributes-on-rerender
I hadn't realized that the MyFaces Commons project had a possible solution for
this, and I'll have to take a look at what they did, as I'm not completely
happy with my own approach.
Maybe someone should open a JSF spec bug on this -- it makes little sense to me
that these things are only evaluated at build-time for a page.
> Can't use expression for validator attributes
> ---------------------------------------------
>
> Key: MYFACES-3547
> URL: https://issues.apache.org/jira/browse/MYFACES-3547
> Project: MyFaces Core
> Issue Type: Bug
> Components: General
> Affects Versions: 2.1.7
> Environment: validator ajax
> Reporter: Deryk Sinotte
> Priority: Minor
> Attachments: validator.zip
>
>
> Attaching a test case that shows a problem when using an expression for an
> attribute in a validator. We have markup that looks like this:
> <h:inputText id="ajaxMy"
> value="#{testBean.myNumber}">
> <f:validateLongRange minimum="1"
> maximum="#{testBean.maxValue}"/>
> <f:ajax execute="@this"
> render="@form"/>
> </h:inputText>
> When the value of the maximum attribute is modified via Ajax from another
> input field, the value of the bean is properly set but the validator doesn't
> resolve appear to resolve the expression at the right time and the result is
> that validation occurs against the "old" values.
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