Java EE (Java Enterprise Edition) General Discussion

I have a Dynamic Web Project made by Eclipse. I would like to change the version on jstl i'm using.

in WEB-IF/lib I putted the two jar files jstl.jar and standar.jar
in WEB-IF/tld I putted the tag libraries

Here you can se part of may web.xml

<web-app xmlns= "http://java.sun.com/xml/ns/j2ee "
xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance "
xsi:schemaLocation= "http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd "
version= "2.4 " >
...
<taglib>
<taglib-uri>http://java.sun.com/jsp/jstl/core</taglib-uri>
<taglib-location>/WEB-INF/tld/c.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jsp/jstl/core</taglib-uri>
<taglib-location>/WEB-INF/tld/c-1_0.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jsp/jstl/core</taglib-uri>
<taglib-location>/WEB-INF/tld/c-1_0-rt.tld</taglib-location>
</taglib>
...
</web-app>

Now if i create a jsp inserting this code:

...
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
...
<c:out value="${1+3}"/>
...

The output will be: '${1+3}' instead of '4'

It seems the EL it's not interpretated... but I don't understand why... Indeed as you can see the version web.xml is 2.4...

Anyone knows where is my error?

Thanks for Helping me.

P.S.
Sorry for my English