[pcleung]

I have put the following line on the top of the jsp

<%@ taglib uri=”http://java.sun.com/jsp/jstl/core&#8221; prefix=”c” %>

but it keeps saying that

Unknown tag <c:set>
Unknown tag <c:out>

[Scott Anderson]

Did you create a MyEclipse Web Project?
Did you add the JSTL libraries to it from the MyEclipse menu?
You’ll need both for validation to work properly.

Can you please post all the information we request in the [URL=http://www.myeclipseide.com/PNphpBB2+file-viewtopic-t-393.html]Posting Guidelines[/URL] thread at the top of this forum? That will give us some context so can dig deeper if the above doesn’t fix it.

[homeinteriors]

I am having the same problem. I noted in your response above that you have to add the JSTL libraries from the MyEclipse menu. I did not do that since the JSTL jars were part of the application already so I did not want to duplicate the jars. I have the JSTL jars that were supplied with the project in my build path. Do I need to do something else to get this to work?

*** Date: Thu Oct 27 15:52:43 CDT 2005

*** System properties:
OS=WindowsXP
OS version=5.1
Java version=1.5.0_04

*** MyEclipse details:
MyEclipse Enterprise Workbench

Version: 4.0.3 GA
Build id: 20051025-4.0.3-GA

*** Eclipse details:
Eclipse SDK

Version: 3.1.0
Build id: I20050627-1435

Eclipse Platform

Version: 3.1.0
Build id: I20050627-1435

Eclipse RCP

Version: 3.1.0
Build id: I20050627-1435

Eclipse Java Development Tools

Version: 3.1.0
Build id: I20050627-1435

Eclipse Plug-in Development Environment

Version: 3.1.0
Build id: I20050627-1435

Eclipse Project SDK

Version: 3.1.0
Build id: I20050627-1435

Eclipse startup command=-os
win32
-ws
win32
-arch
x86
-launcher
C:\eclipse\eclipse.exe
-name
Eclipse
-showsplash
600
-exitdata
824_60
-vm
C:\Program Files\Java\jdk1.5.0_04\bin\javaw.exe

[Riyad Kalla]

pwielard,
Having the JARs there should be fine, can you expand the JAR listed in your package view named standard.jar, go into the META-INF dir, and open the c.tld file, then copy-paste the <uri></uri> line here for me to see? Then open a JSP that has an error marked in it and copy and paste the <%@taglib entries from it and put them here for me as well?

[homeinteriors]

From the c.tld file in standard.jar:
<uri>http://java.sun.com/jstl/core</uri&gt;
From the jsp:
<%@ taglib uri=”jstl-fmt” prefix=”fmt” %>
<%@ taglib uri=”jstl-c” prefix=”c” %>
<%@ taglib uri=”struts-html-el” prefix=”html” %>

These uris are defined in web.xml and the tlds do exist in the taglib location directory.
<taglib>
<taglib-uri>jstl-c</taglib-uri>
<taglib-location>/WEB-INF/tld/c-rt.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>jstl-fmt</taglib-uri>
<taglib-location>/WEB-INF/tld/fmt-rt.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>struts-html-el</taglib-uri>
<taglib-location>/WEB-INF/tld/struts-html-el.tld</taglib-location>
</taglib>

I have also tried to change the uri in the jsp to be what is in the tld (http://java.sun.com/jstl/core) but I still get the warning that it is an unknown tag.

Thanks.

Paul Wielard

[Riyad Kalla]

Paul,
Can you try and restart using the -clean command line option, and then rebuild your project? If that doesn’t work please give me your Eclipse Build iD (Help > About) and MyEclipse Build ID (Window > Prefs > MyEclipse)

[homeinteriors]

From the eclipse directory I ran ‘eclipse.exe -clean’ and then I ran the clean option under the Project menu which cleaned the project and then it did a build automatically. Unfortunately, I still get the Unknown Tag warning for all the jstl tags.

Eclipse Build ID:
Version: 3.1.0
Build id: I20050627-1435

MyEclipse Build ID:
Version: 4.0.3 GA
Build Id: 20051025-4.0.3-GA

Thanks.

Paul Wielard

[Riyad Kalla]

Paul,
Let’s try something silly here to make sure we are on the right track… try creating a new web project, be sure to select the correct J2EE spec level, then add the necessary JSTL libs to it, then drag and drop your project from the old project into the new one… did that work?

[homeinteriors]

I tried it in a new project with one JSP copied over from project I am working. It works fine in the new project but not in the old one. I did some changes to make it closer to the old project like putting all tlds in a tld like the authors of the current project did. I am not sure what the difference is but the new small project works ok but the one that I am working on does not.

Any ideas?

Paul Wielard

[Riyad Kalla]

Try removing the <Taglib> entries from your web.xml file and using the default URIs in your <%@ taglib entries… do tjhose pages validate alright? If you are still having trouble, rename your problom project to <name>-old, and create a new web project, just like it, called <name> and drag and drop the resources over a folder at a time, making sure they are validating correctly. This will either a) get you a new working project or b) let us know what it is that breaks it if you piecemeal the transition and make sure it is validating as you go, and then see where it breaks.

It’s hard to say from here, what it could be, it could be many things, so I’m trying to get us on a track of self-diagnostic, hopefully the problem will reveal itself and we can stomp on it.

[Author]

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