HelloWorld.java

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HelloWorld
{

    public HelloWorld()
    {
        // Do nothing
    }

    public void sayHello(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        response.getOutputStream().write( "Hello World".getBytes() );
    }
}