Problem in executing a JSP file that includes a Custm tag

Hi,
I am very new to JSP,especially custom tags. I tried to run my first custom tag program but i cud not succeed.
I tried to run it using Tomcat as well J2ee1.3. But still cud not c the output.
I have placed jsp file,TLD etc in Web inf of root dir and class file inside classes folder..but i got some error saying tag with prefix not found in the tag library...
i tried in all the ways but all in vain... I will post my code and exact error i faced.. can anyone help me soon to see the output?
WelcomCtag.java
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
public class WelcomeCtag extends TagSupport
     private String Name=null;
     public String getName()
          return Name;
     public int doStartTag()
          try
               JspWriter output=pageContext.getOut();
               output.println("Welcome" + getName());
          }catch(Exception e)
               throw new Error("Encountered an errer");
          return SKIP_BODY;
     public int doEndTag()
          try{}
          catch(Exception e)
               throw new Error("Encountered an errer");
          finally
               return SKIP_PAGE;
[u]example.tld[/u]
<taglib>
     <tlibversion>1.0</tlibversion>
     <jspversion>1.1</jspversion>
     <shortname>example</shortname>
     <info> A small example for usage of the tag library</info>
     <tag>
          <name> Welcome></name>
          <tagclass>WelcomeCtag</tagclass>
     <bodycontent>empty</bodycontent>
     <info>This tag is an example to display a welcome message</info>
     <attribute>
          <name>Name</name>
          <required>true</required>
          <rtexprvalue>true</rtexprvalue>
     </attribute>
     </tag>
</taglib>
[u]WelcomeCustomtag.jsp[/u]
<%@ taglib prefix="example" uri="./example.tld" %>
<html>
<title>Welcome Handler</title>
</head>
<body>
<example: Welcome Name="Panduranga"/>
</body>
</html>
and the error i get while executing is here..........
org.apache.jasper.JasperException: /WelcomeCustomtag.jsp(6,0) No tag "" defined in tag library imported with prefix "example"
     org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
     org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:405)
     org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:196)
     org.apache.jasper.compiler.Parser.parseCustomTag(Parser.java:1308)
     org.apache.jasper.compiler.Parser.parseElements(Parser.java:1564)
     org.apache.jasper.compiler.Parser.parse(Parser.java:126)
     org.apache.jasper.compiler.ParserController.doParse(ParserController.java:211)
     org.apache.jasper.compiler.ParserController.parse(ParserController.java:100)
     org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:146)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:556)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
when i referred some other tutorials some have stored the tld file inside a folder called tags inside web inf and they have used like this <tags:example> etc and it wrked but if i want to specify some attributes i dunno how to give using <tags> style....
Can anyone help me n tell me the difference in using tag like this <eample> and <tags: example> like this.....
Thanks,
Akshatha

1.
Multiple tlds in web.xml
Have multiple taglib elements in your web.xml - see below.
<jsp-config>
<taglib>
     <taglib-uri>http://example/taglib</taglib-uri>
     <taglib-location>/WEB-INF/example.tld</taglib-location>
</taglib>
   <taglib>
      <taglib-uri>http://anotherexample/taglib</taglib-uri>
       <taglib-location>/WEB-INF/anotherexample.tld</taglib-location>
   </taglib>
</jsp-config>The jsp-config element should be just after the servlet-mapping element in servlet 2.3 spec.
For 2.4 spec, you can put it anywhere.
In your jsp, to use the tags from the two tag libraries, use 2 taglib directives
<%@ taglib prefix="example" uri="http://example/taglib" %>
<%@ taglib prefix="anotherexample" uri="http://anotherexample/taglib" %>
<example:tag1.................>
<anotherexample:tag2.................> etc2.
Mutliple tags per tld
Have multiple <tag> elements in your tld.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
   <tlib-version>1.0</tlib-version>
   <jsp-version>1.2</jsp-version>
   <short-name>j2ee</short-name>
   <tag>
      <name>tagName</name>
      <tag-class>pkgName.classname</tag-class>
      <body-content>JSP</body-content>
      <display-name>OverlapTag</display-name>
      <attribute>
         <name>attr1</name>
         <required>false</required>
         <rtexprvalue>true</rtexprvalue>
      </attribute>
      <attribute>
         <name>attr2</name>
         <required>false</required>
         <rtexprvalue>true</rtexprvalue>
      </attribute>
   </tag>
   <tag>
      <name>tag_2_Name</name>
      <tag-class>pkgName.classname</tag-class>
      <body-content>JSP</body-content>
      <display-name></display-name>
      <attribute>
         <name>attr1_2</name>
         <required>false</required>
         <rtexprvalue>true</rtexprvalue>
      </attribute>
      <attribute>
         <name>attr2_2</name>
         <required>false</required>
         <rtexprvalue>true</rtexprvalue>
      </attribute>
   </tag>
</taglib>
Interesting snippet
If you are using a 3rd party tag library, then the tags would come packaged in a jar file. The MTEA-INF directory of the jar file would contain the tlds and the tld would have an uri element. You can use it directly in the jsp without declaring the tld file in web.xml provided the jar file is in your classpath.
For example, take the struts tag libraries, say the logic tags.
The struts.jar contains, among other things, the tag class files and the tld files (inside /META-INF/tlds)
All you have to do is put Struts.jar in the classpath (easy way to do this is put it in the WEB-INF/lib directory of your web-application).
The jar file has struts-logic-1.1.tld in the META-INF/tlds directory.
This tld file looks like this
<taglib>
<tlibversion>1.2</tlibversion>
<jspversion>1.1</jspversion>
<shortname>logic</shortname>
<uri>http://jakarta.apache.org/struts/tags-logic</uri>
..................Now to use the tags in your jsp, you dont require the tld mappings in web.xml using the uri above in the taglib directive in your jsp
<%@ taglib prefix="example" uri="http://jakarta.apache.org/struts/tags-logic" %> cool, right ? :)
This is how you should pkg your own tags too. The tag classes have to be jarred and the tlds should go into the META-INF of the jar so that other users can simply add the jar to the cp and start using your tags.
cheers,
ram.

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