cannot find the declaration of element taglib

[sudhakar karnati]

Hi All,

I am using eclipse to practice custom tag examples given in the HFSJ

in eclipse i created new project as apache tomcat project and in WEB-INF folder i created a file named simple.tld with the following content

<?xml version = "1.0" encoding ="ISO-8859-1" ?>
<taglib 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/web-jsptaglibrary_2_0.xsd" version="2.0">

<tlib-version>1.2</tlib-version>
<uri>simpleTags</uri>
<tag>
<description>marginally better use of a custom tag</description>
<name>simple1</name>
<tag-class>foo.SimpleTagTest1</tag-class>
<body-content>empty</body-content>
</tag>
</taglib>



and usetag.jsp with the following content
package foo;

import java.io.IOException;


import javax.servlet.jsp.tagext.SimpleTagSupport;
import javax.servlet.jsp.JspException;

public class SimpleTagTest1 extends SimpleTagSupport {

public void doTag() throws JspException, IOException {
getJspContext().getOut().print("This is the lamest use of a custom tag");
}
}

and SimpleTagTest1.java is placed in foo pacakge

but i am getting this error:
cvc-elt.1: cannot find the declaration of element 'taglib'

Can any body suggest me what is wrong?

Thanks & Regards,
Sudhakar Karnati
[ April 17, 2008: Message edited by: sudhakar karnati ]

[Christophe Verré]

but i am getting this error:cvc-elt.1: cannot find the declaration of element 'taglib'

Where did you get this error ?

[sudhakar karnati]

I am getting this error in the eclipse.

[Marc Peabody]

Try...

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"

... as your schema location in the TLD. This is really how it should be but I don't think Eclipse was so picky about it in the past.
[ April 17, 2008: Message edited by: Marc Peabody ]

[sudhakar karnati]

Marc, Do you want me to remove version="2.0" attribute in the taglib..

and i did not include any web.xml in the project because there is no such thing explained in the HFSJ about web.xml in the Custom tag development chapter till the page i read.

I tried by removing verion attribute it is still showing the same error.

Please help some body..

Thanks & Regards,
Sudhakar Karnati
[ April 17, 2008: Message edited by: sudhakar karnati ]

[Marc Peabody]

Originally posted by sudhakar karnati:
I tried by removing verion attribute it is still showing the same error.

Ummm... but that's not what I said to try. You came up with that.

Are we communicating or are we both talking to ourselves here?

Did you try what I recommended?

[sudhakar karnati]

  <?xml version = "1.0" encoding ="ISO-8859-1" ?>
<taglib 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-jsptaglibrary_2_0.xsd"" target="_blank" rel="nofollow">http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"</a>
version = "2.0">
 
<tlib-version>1.2</tlib-version>
<uri>simpleTags</uri>
<tag>
<description>marginally better use of a custom tag</description>
<name>simple1</name>
<tag-class>foo.SimpleTagTest1</tag-class>
<body-content>empty</body-content>
</tag>
</taglib>  

I have changed my simple.tld as above and now it is showing 41 errors:

I did not create any web.xml file,if it should be created how it should be because in HFSJ that is not explained how to configure web.cml for tld(till the page i read)..

Please help me

Thanks & Regards,
Sudhakar Karnati

[Christophe Verré]

When I asked "Where did you get this error ?", I was asking which file.

[Christophe Verré]

This works:
The tag

package foo;
 
import java.io.IOException;
 

import javax.servlet.jsp.tagext.SimpleTagSupport;
import javax.servlet.jsp.JspException;
 
public class SimpleTagTest1 extends SimpleTagSupport {
 
public void doTag() throws JspException, IOException {
getJspContext().getOut().print("This is the lamest use of a custom tag");
}
}

The TLD (under WEB-INF)

<?xml version = "1.0" encoding ="ISO-8859-1" ?>
<taglib 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-jsptaglibrary_2_0.xsd"" target="_blank" rel="nofollow">http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"</a>
version = "2.0">
 
<tlib-version>1.2</tlib-version>
<uri>simpleTags</uri>
<tag>
<description>marginally better use of a custom tag</description>
<name>simple1</name>
<tag-class>foo.SimpleTagTest1</tag-class>
<body-content>empty</body-content>
</tag>
</taglib>

The JSP

<%@ taglib uri="simpleTags" prefix="csajsp" %>
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
 
<csajsp:simple1 /><br>
 
</body>
</html>

If you still have errors, this thread will be moved to the Eclipse forum.

[Christophe Verré]

Also, put a web.xml looking like this under WEB-INF :

<?xml version="1.0" encoding="ISO-8859-1"?>
<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">
 
</web-app>

[sudhakar karnati]

Thanks very much Christophe Verre.

Thanks very much for posting code also..

The thing i have learnt from this issue is for learners Netbeans is better option than Eclipse...

I experienced difficulty in using eclipse because we have to add plug-ins compared to Netbeans..

But i remember one thing in the preface page or somewhere in the HFSJ book it is given that if we are really preparing SCWCD we should not use any IDE..

but i have seen a topic which is totally about which IDE we should use..

even i am using IDE for practicing examples because it makes our life easy..


Thanks & Regards,
Sudhakar Karnati
[ April 18, 2008: Message edited by: sudhakar karnati ]