Help! tomcat 5.5 does'nt run my servlet.

hi
i made servlet program:
________________________________
//A.java
import javax.servlet.*;
import java.util.Enumeration;
import java.io.IOException;

public class A implements Servlet
{
 public void init(ServletConfig c) throws ServletException
 {
   System.out.println("test1");
   Enumeration parameters=c.getInitParameterNames();
   while(parameters.hasMoreElements())
   {
        System.out.println("test2");
        String p=(String)parameters.nextElement();
        System.out.println("parameter name :"+ p);
        System.out.println("parameter value :"+c.getInitParameter(p));
   }
 }

 public void destroy(){}
 public void service(ServletRequest s,ServletResponse r) throws ServletException,IOException{}
 public String getServletInfo()
 {
   return null;
 }
 public ServletConfig getServletConfig()
 {
    return null;
 }
}
----------------------------------------------------

compiled it and put it in   c:\tomcat\webapps\h\WEB-INF\classes\     folder
i made the following web.xml and its in the folder-      c:\tomcat\webapps\h\WEB-INF\
------------------------------------------------------
<web-app>
  <servlet>
    <servlet-name>A</servlet-name>
    <servlet-class>A</servlet-class>
    <init-param>
      <param-name>admin</param-name>
      <param-value>ad@max</param-value>
    </init-param>
    <init-param>
      <param-name>number</param-name>
      <param-value>233</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>A</servlet-name>
    <url-pattern>/A</url-pattern>
  </servlet-mapping>

</web-app>
--------------------------------------------------------

now when i enter - http://localhost:8080/h/A

a blank page shows up.
tomcat is running fine and i've run another servlet program before which ran properly.

please help...