jstl - Error in EL Expression -


i trying use fn:length , c:when 

<c:when test="${fn:trim(${properties.num2display})== null}">     <c:set var="counter" value="3"/>     condition 1  </c:when>

gives me error : 

contains invalid expression(s): javax.el.elexception: error parsing:     ${fn:trim(${properties.num2display})== null}

what correct way write expression inside fn:trim?

try this:

<c:when test="${not empty fn:trim(properties.num2display)}">     <c:set var="counter" value="3"/>     condition 1  </c:when>

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