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I've been trying for longer than I'd like to admit to get JSTL working under Eclipse (and ultimately under GAE/J). I've downloaded Eclipse, the Google App Engine Extension for Eclipse, and JSTL (http://download.java.net/maven/1/jstl/jars/ - jstl-1.2.jar is in the WEB-INF\lib directory).
My code is below along with the output:
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<HTML><HEAD><TITLE>Test Page</TITLE></HEAD><BODY>
Test Page
<c:set var="myvar" value="3"/>
</BODY></HTML>
The error I get is:
The tag handler class for "c:set" (org.apache.taglibs.standard.tag.rt.core.SetTag) was not found on the Java Build Path
test.jsp
[my app's path and name]
line 8
JSP Problem
From the last post on this page I don't think I need a standard.jar (http://forums.sun.com/thread.jspa?threadID=701267) and in any case I couldn't find one on the Oracle download.java.com site along with the jstl jar.
EDIT 4: Works now - Steps:
1) Use the Apache version
2) Actually include the jar file in the build path (right click the eclipse project and hit Properties -> Java Build Path -> Libraries -> Add Class Folder...; the war/WEB-INF/lib is apparently not on the build path by default)
3) Add the file c.tld to war/WEB-INF/tld
Make your web.xml look like:
<\?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 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">
<display-name>JSTLExample</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
<jsp-config>
<taglib>
<taglib-uri>http://java.sun.com/jstl/core</taglib-uri>
<taglib-location>/WEB-INF/tld/c.tld</taglib-location>
</taglib>
</jsp-config>
</web-app>
The test jsp file contents:
<?xml version="1.0" encoding="UTF-8" ?>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!-- Taglib -->
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Test Apache ServiceMix with JSTL</title>
</head>
<body>
This is a testpage.
<%= "hello" %>
<c:forEach var="i" begin="1" end="10" step="1">
<c:out value="${i}" />
<br />
</c:forEach>
</body>
</html>
Add taglibs-standard-impl-1.2.5 from Apache to the build path of the project. This may resolve the issue.
You only need to specify this dependency in your Maven POM:
In my code, this provided everything I needed for the following JSP taglib to work:
I had the same issue and I simply put the prefix = "c" at the end of the taglib definition
before:
after:
And all warnings disappear from Eclipse.
Ensure that your
web.xmlroot declaration complies at least Servlet 2.4.Or if your servletcontainer supports it, prefer 2.5:
O if it supports the latest version3.0
Otherwise everything will fall back to least supported modus and taglibs may break like that.
Also ensure that you don't have loose
tldfiles wandering around in the classpath (the/WEB-INF/libfolder, among others), they will collide with the ones in JAR files. Oh, also ensure that you didn't manually define the tlds inweb.xml, keep it clean.As far as i know you need jstl.jar and standard.jar. Put those under WEB-INF/lib.