Help about JSTL: I can't use c:if .. in option.. !

Question

Hi, all
I build my project on STRUTS before, and using the tableligs of struts,But now ,I find it is a good choice using JSTL.However ,problems accurred as follows:
(my project is on Eclipse and Tomcat)
In the page , I have already include that:
<%@ taglib uri="/jstl/core" prefix="c" %>
<%@ taglib uri="/jstl/fn" prefix="fn" %>
<%@ page isELIgnored="false"%>
In web.xml, I added that :
<taglib>
<taglib-uri>/jstl/core</taglib-uri>
<taglib-location>/WEB-INF/c.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/jstl/fn</taglib-uri>
<taglib-location>/WEB-INF/fn.tld</taglib-location>
</taglib>
Problem occur here:
<select name="category">
<option value="IM1" <c:if test="${CCOption == 0}"> selected</c:if> ><bean:message key="IM1"/></option>
but the system told that " undefined attribute name <c:if .... " that is to say, they cannot find the tag in this page,but I have try to put the <c:if to ..>out , not in the <option...> ,then that is OK.
But in fact ,we can use the tag <c:if....> in such as <option...> and so on . I don't know why I can't.
By the way, in jslt 1.1, JSTl.jar/standard.jar have 15 .tld files , I don't
know what are the differences among the file c-1_0-rt.tld, c-1_0.tld and c.tld(which are inclued in the 15 tld files)?How can I set up JSTL in my Tomcat?
Look forward for your help!
Many thanks in advance!

Answer 1

You may find it useful to go and read [url http://forum.java.sun.com/thread.jspa?threadID=629437&tstart=0] this post. (reply #6)
Basically you are making a whole lot of work for yourself that you don't need.
JSTL doesn't need the tld files in WEB-INF.
It doesn't need entries in web.xml
All it needs is you to use the standard import URI: <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
So get rid of those tlds. Leave them hidden inside the jar file. Tomcat will find them there.
The other thing of not is the <%@ page isELIgnored="false"%> attribute you have.
You only need this because your web.xml is defining itself as version2.3.
If you update your web.xml to version2.4, EL is enabled by default
Hope this helps,
evnafets