I have tried to use function tag in my jsp page. However, I kept receiving this error message:
<h3>Validation error messages from TagLibraryValidator for c</h3><p>35: tag = 'out' / attribute = 'value': An error occurred while parsing custom action attribute "value" with value "${fn:toUpperCase(who)}": org.apache.taglibs.standard.lang.jstl.parser.ParseException: EL functions are not supported.</p>
It seems that I got some configuration problem with function tag, but can't find out what it exactly is. The core, xml, sql, fmt tags all could run properly, I really can't understand what is wrong with function. I am using jstl 1.1 and located in the lib folder. I addressed
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
on the top of the page.
Please help me out. Many thanks