This error comes in when you are trying to use the JSTL core tag library in your JSP page but the web container is not able to locate corresponding TLD files, also known as tag library descriptors. In order to use the custom tags in the JSP page, the first step is to import them using the @taglib directive and for that purpose, we provide a URI. Many JSP developer thinks this is the location where TLD files are stored but that's not true, this is actually the value, custom tab library developer has put in the URL field of tag library descriptor. This misunderstanding causes lots of trouble while solving "Can not find the tag library descriptor for “http://java.sun.com/jsp/jstl/core”.
