Be sure to have this configuration to be able to use JSTL:
web.xml header (remove space after <):
< ?xml version="1.0" encoding="ISO-8859-1"?>
< xmlns="http://java.sun.com/xml/ns/j2ee"
xsi="http://www.w3.org/2001/XMLSchema-instance"
schemalocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4">
Taglib declaration:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>