Help on Tag Files - attribute directive.

[Manikandan Jayaraman]

Below is my code in short. Can someone help. I use tomcat 5.1.15.
===

The Tag File - SmallHeader.Tag
------------------------------

    
<%@ attribute name="testAttribute" required="true" rtexprvalue="true" %>
 
<font color = "RED">
<b>This is a small included file. Used to demonstrate Tag Files.</b> <br>
This tag has a MANDATORY Attribute. Its value is : ${testAttribute} <br>
 
<br>
<br>
<br>
</font>

My Jsp - TagFileDemo.jsp
------------------------

    
<%@ page isELIgnored="false" %>
<%@ taglib prefix="mani" tagdir="/WEB-INF/tags" %>
 
<mani:SmallHeader testAttribute="Good Morning Mani!">
</mani:SmallHeader>
 
<font color="green">
<i>The above output comes from the tag file.<i>
</font>

===================
The Output I get is
===================

This is a small included file. Used to demonstrate Tag Files. 
This tag has a MANDATORY Attribute. Its value is : ${testAttribute} 
 
The above output comes from the tag file. 

======

Why my attribute value doesn't get printed?

======

[Bachi Taurean]

Hi

Just tried your example and is running perfectly fine. Here is the output I get:

"This is a small included file. Used to demonstrate Tag Files.
This tag has a MANDATORY Attribute. Its value is : Good Morning Mani!



The above output comes from the tag file."

With appropriate font colors. I am using Tomcat5.0.28. For safer side pls check if you are using the right DTD for web.xml and you have included the latest jar's for servlet-api and jsp-api. Just in case...

[Manikandan Jayaraman]

Thanks! Though it sounds happy in one side that I have not committed anything wrong in the code, I am puzzled as to why it doesn;t display for me.

Infact I simplified the code for you people. I even displayed the body content using <jsp oBody />. Body content is getting displayed but only attribute is the problem.

So it shouldn't be the web.xml problem. am I right?

[Christophe Verré]

So it shouldn't be the web.xml problem

It is. Make sure you are using version 2.4, not 2.3.
http://faq.javaranch.com/view?ServletsWebXml

[Niranjan Deshpande]

i am getting this

org.apache.jasper.JasperException: /TagFileDemo.jsp(4,0) No tag "SmallHeader" defined in tag library imported with prefix "mani"
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
org.apache.jasper.servlet.JspServlet.serviceJspFile

whats wrong ?

[Bachi Taurean]

Hi Niranjan,

Please make sure if the following are correct in your case

(1) You have your tag file in WEB-INF\tags directory
(2) Your web.xml uses the correct namespace/DTD(latest servlet/jsp spec's).
(3) Go to common\lib directory of tomcat and make sure you have servlet-api.jar and jsp-api.jar there
(4) The Manifest.mf file in servlet-api.jar should have lines something like this:

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.6.1
Created-By: 1.4.2-b28 (Sun Microsystems Inc.)

Name: javax/servlet/
Specification-Title: Java API for Servlets
Specification-Version: 2.4
Specification-Vendor: Sun Microsystems, Inc.
Implementation-Title: javax.servlet
Implementation-Version: 2.4.public_draft

(5)Similarly the Manifest.mf file in jsp-api.jar should have the following lines:

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.6.1
Created-By: 1.4.2-b28 (Sun Microsystems Inc.)

Name: javax/servlet/jsp/
Specification-Title: Java API for JavaServer Pages
Specification-Version: 2.0
Specification-Vendor: Sun Microsystems, Inc.
Implementation-Title: javax.servlet.jsp
Implementation-Version: 2.0.public_draft
Implementation-Vendor: Apache Software Foundation
Implementation-Vendor: Apache Software Foundation

(6)Last but not the least check for case sensitiveness.

Do let me know if it solves the problem for you.

[Niranjan Deshpande]

i checked everything.
but still

[Bachi Taurean]

Please print the contents of your web.xml file.lets try...

[Niranjan Deshpande]

<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
  Copyright 2004 The Apache Software Foundation
 
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
 
      <a href="http://www.apache.org/licenses/LICENSE-2.0" target="_blank" rel="nofollow">http://www.apache.org/licenses/LICENSE-2.0</a>
 
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->
 
<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 <a href="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"" target="_blank" rel="nofollow">http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"</a>
     version="2.4">
 

  <display-name>Welcome to Tomcat</display-name>
  <description>
     Welcome to Tomcat
  </description>
 
<!-- JSPC servlet mappings start -->
 
    <servlet>
        <servlet-name>org.apache.jsp.index_jsp</servlet-name>
        <servlet-class>org.apache.jsp.index_jsp</servlet-class>
    </servlet>
 
    <servlet-mapping>
        <servlet-name>org.apache.jsp.index_jsp</servlet-name>
        <url-pattern>/index.jsp</url-pattern>
    </servlet-mapping>
<!-- JSPC servlet mappings end -->
 
</web-app>

[Christophe Verré]

try to rename the tag file in lowercase. I don't know if it's important or not. I've tried under Tomcat5.5 and it worked with uppercase.