How to select the first element of a set with JSTL?

Question

I managed to do it with the next code but there must be an easier way.

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>


<c:if test="${fn:length(attachments) > 0}">
    <c:forEach var="attachment" items="${attachments}" varStatus="loopCount">
        <c:if test="${loopCount.count eq 1}">
         attachment.id
        </c:if>
    </c:forEach>
</c:if>

Answer 1

You can access individual elements with the array [] operator:

<c:out value="${attachments[0].id}" />

This will work for arrays, lists and sets. It won't work for maps. In that case you must put the key of the element inside the brackets.

Answer 2

You could create a custom function.

Answer 3

Work for arrays and lists only, not for set.

Answer 4

Hello,

Using ${mySet.toArray[0]} does not work.

I do not think it is possible without having forEach loop at least one iteration.

Answer 5

${mySet.toArray().getAt(0)}