The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application

The problem happens because you didn't declare the tag libs in your web.xml file.

Follow the steps:

1 - If you are using the newest version of JSTL ( 1.0.6 ) then you can find the tld files at "tld" folder, else you have to extract the standard jar and search into folders;

2 - Put the tld file in WEB-INF folder;

3 - Open web.xml at WEB-INF folder and write the declaration below:

<taglib>
<taglib-uri>http://java.sun.com/jstl/fmt</taglib-uri>
<taglib-location>/WEB-INF/fmt.tld</taglib-location>
</taglib>

4 - Make sure that you are calling:

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

on top of your JSP page;

5 - Restart your server if it's running and..

Solved!