I am trying to call a Java method from a JSP script.

This is the Java code

package my_package;
import java.io.*;

public class CountUsers
{
               public CountUsers()
               {
               }

               public void logUsers(String fileName, String content)
               {
                   //some code
               }
}

This is some of the JSP code:

<%@ page import="my_package.CountUsers" %>
<jsp:useBean id="countUsers" scope="session"
class="my_package.CountUsers"/>

RESULT:
When loading the JSP page, I get an error saying: The value for the
useBean class attribute my_package.CountUsers is invalid.

QUESTION:
Do I have to place my java class in some specific folder for the JSP
to find it?
I am using Tomcat 6 on the server by the way.