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https://issues.apache.org/jira/browse/MYFACES-3547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13459085#comment-13459085
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Mike Kienenberger commented on MYFACES-3547:
--------------------------------------------
To answer my own question, the key is to create a custom Facelets validator
MetaRule which detects when an attribute value is non-literal. In that case,
the rule will call a custom method to inject the ValueExpression rather than
setting the attribute value directly. The validator or converter is
responsible for storing the ValueExpression in state and then evaluating it
when needed.
MyFaces Commons provides a framework for making all of this happen with minimal
effort. However, someone could simply create their own MetaRule based on the
_ValidationRule in MyFaces Commons, and do this themselves.
http://svn.apache.org/viewvc/myfaces/commons/trunk/myfaces-commons-validators/src/main/java/org/apache/myfaces/commons/validator/_ValidatorRule.java?view=markup
> 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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