Servlet HelloWorld

Question

I am new in servlet , so I am trying to run HelloWorld example but I couldn't success till now:
this is my servlet example code :
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
     public class HelloWorld extends HttpServlet {
     public void doGet(HttpServletRequest request,
     HttpServletResponse response)
     throws ServletException, IOException {
     PrintWriter out = response.getWriter();
     out.println("Hello World");
I compiled successufly ,
and this is the web.xml
<!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>
<servlet>
<servlet-name>hello</servlet-name>
<servlet-class>HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>hello</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
</web-app>
I am using t omcat , I did put the compiled class on : C:\Tomcat 4.1\webapps\ROOT\WEB-INF\classes
afetr that i runed tomcat then
http://localhost:8080/WEB-INF\classes\HelloWorld
but there is an error : description The requested resource (/WEB-INF/classes/HelloWorld) is not available.
any help :)

Answer 1

I did read the documentation , and i flowed all steps but it doesn't work, so i think the task of this forum is to exchange knowledge !!
i did change the xml file and i did get new error
<web-app>
<servlet>
<servlet-name>hello</servlet-name>
<servlet-class>HelloWorld</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>invoker</servlet-name>
<url-pattern>/servlet/*</url-pattern>
</servlet-mapping>
</web-app>
Cannot allocate servlet instance for path /servlet/HelloWorld
any help