Calling this simple servlet from command line -- ERRORS!

Question

Below is my servlet. I call from command line via:
java BatchServlet
and I get:
Exception in thread "main" java.lang.NoClassDefFoundError: BatchServlet
IS there a reason for this
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.*;
public class BatchServlet extends HttpServlet implements Runnable{
static Thread t = null;
public void init(ServletConfig c) throws ServletException{
super.init(c);
if (t==null){
t = new Thread(this);
t.start();
public void run(){
while (true){
try{
Thread.sleep(5000);
}catch (InterruptedException ie){
ie.printStackTrace();
System.out.println("Wake up");

Answer 1

Same error with this little prog.....
Notice main method
package wch.util;
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.*;
public class test {
public void main(){
System.out.println("test");