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This article, Expression Language Overview” href=”http://www.informit.com/articles/article.aspx?p=30946″>InformIT: The JSTL Expression Language > Expression Language Overview, informed me on how to test if something is empty or not.
Empty?
<c:if test="${empty foo}">...</c:if>
Not empty?
<c:if test="${not empty foo}">...</c:if>