A kind of friendly error that would bade a visit while working on JSF and Tomcat would be: java.lang.NoClassDefFoundError – javax/servlet/jsp/jstl/core/Config.
Thankfully, this has a very simple remedy of adding JSTL jars of standard.jar and jstl.jar.
You can get those jars from http://jakarta.apache.org/site/downloads/downloads_taglibs.html
Cesar
Link is dead đ