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taglibs error

prashanth kalvala
Greenhorn

Joined: Dec 11, 2002
Posts: 1
Hello friends,
I just started working on taglibs. As usual i started out with a set of errors. I am using
Tomcat 4.1 over Windows 98
I am not sure if i have the directory structure correct.
I created a sample directory under webapps and my application is called sample. I have the files as following
/Webapps
|---/Sample
|------/Web-Inf
| |--/classes
| | |-------HelloTag.class
| |--web.xml
| |--HelloTag.tld
|------Hello.jsp
Hello.jsp
===========
<%@ taglib uri="http://localhost:8080/sample" prefix="examples" %>
<html>
<head>
<title>First custom tag</title>
</head>
<body>
This is static output.
<p />
<i>
<examples:hello></examples:hello>
</i>
This is static output again.
</body>
</html>
Web.xml is as follows
=====================
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<display-name>Sample</display-name>
<description>
Welcome to Sample
</description>

<taglib>
<taglib-uri>/WEB-INF/HelloTag.tld</taglib-uri>
<taglib-location>/WEB-INF/HelloTag.tld</taglib-location>
</taglib>
</web-app>
HelloTag.tld
============
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE taglib
PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN"
"http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">
<taglib>
<tlibversion>1.0</tlibversion>
<jspversion>1.1</jspversion>
<shortname>examples</shortname>
<info>Simple example library.</info>
<tag>
<name>hello</name>
<tagclass>HelloTag</tagclass>
<bodycontent>JSP</bodycontent>
<info>Simple example</info>
</tag>
</taglib>
I had a error free compile on the file HelloTag.class and the class name is HelloName.
The servlet container throws an Null Pointer Exception.
Any Pointers to why this occurs?
Thanks In Advance.
Prashanth Kalvala
Sam Dalton
Author
Ranch Hand

Joined: Jul 26, 2001
Posts: 170
I can immediately see two problems:
1) The WEB-INF directory MUST be capitalised.
2) The taglib URI that you have used on your JSP does not match that declared in your web.xml
Try and resolve these issues and let us know if there are more problems
Cheers
Sam


<a href="http://www.samjdalton.com" target="_blank" rel="nofollow">Sam Dalton</a>,<br />Co-author of [http://www.amazon.com/exec/obidos/tg/detail/-/1590592255/qid=1068633302//ref=sr_8_xs_ap_i0_xgl14/104-4904002-9274339?v=glance&s=books&n=507846]Professional JSP 2.0[/URL] (October 2003)<br />Co-author of <a href="http://www.amazon.com/exec/obidos/ASIN/1861007701/ref=ase_electricporkchop" target="_blank" rel="nofollow">Professional SCWCD Certification</a><br />Co-author of <a href="http://www.amazon.com/exec/obidos/ASIN/186100561X/ref=ase_electricporkchop" target="_blank" rel="nofollow">Professional Java Servlets 2.3</a>
 
 
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