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https://issues.apache.org/jira/browse/MYFACES-3547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13276483#comment-13276483
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Leonardo Uribe commented on MYFACES-3547:
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It is a known weakness in jsf standard converters and validator. To overcome
this limitation, some converters and validators were created in MyFaces Commons
project that evaluates its parameters when the value is checked, There is no
variant for f:validateLongRange, but there is a mcc:convertNumber and
mcc:convertDateTime.
Unfortunately, by compatibility with the spec it is not possible to change the
current behavior. A change should be done at spec level. It is possible to
write a custom implementation of that validator using myfaces builder plugin.
> 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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