I am facing issue with JSTL tag library usage in JBoss6.1. Sometimes jstl tags like c:set, c:choose etc....do not work at some line while the same tag is working at other line in the same xhtml page. This makes it difficult to debug as we can't say why it is not working at one place but working at other. Is there a change in JSTL Library version for JBoss6.1? Please help me with the solution if anybody else has faced it before.