Problem using JSTL <c:out> tag

[matto]

Hi,
am facing a problem using the <c:out> tag in a jsp. The tag simply gets not evaluated.

JSP:

%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<c:set var="hello" value="Hello World!"/>
<c:out value="${hello}"/>

The output is:

${hello}

I'm using JSTL 1.1. The tlds are contained in the WEB-INF/tld directory, and mapped by the web.xml taglib directive to the appropriate location.

web.xml:

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

The JSP is managed by the JstlTilesView (spring 2.0)
The problem manifests in tomcat 5.5.20 and Sun appserver 1.5.
I have read numerous problem descriptions and solutions but none of them is solving my problem.
does anyone have an idea?

thanks in advance, regards
matto