Question

double it.error=1 ,int it.d=2

<h:outputText value="#{it.error}">
    <f:convertNumber maxFractionDigits="2" minFractionDigits="2"/>
</h:outputText>

displays 1.00

but

<h:outputText value="#{it.error}">
    <f:convertNumber maxFractionDigits="#{it.d}" minFractionDigits="#{it.d}"/>
</h:outputText>

displays 1

Using tomcat 6.0.29 and mojarra 2.1.4

Answer 1

That can happen if the <h:outputText> is inside a <h:dataTable> and thus #{it} is not available in the scope when the view is been built (but only when the view is been rendered). The tag handlers like <f:xxx> are only created/evaluated when the view is been built.

There are several ways to workaround this problem, all which are outlined in the following answer: How to set converter properties for each row of a datatable?