JDBCTest is just a normal class; it needs to be a servlet tobe used with Tomcat.
import java.io.*;
import javax.servlet.http.*;
import javax.servlet.*;
public class TestServlet extends HttpServlet
{
public void doGet (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
PrintWriter out = response.getWriter();
out.println("Hello world");
}
}
Google "java servlets" or "java servlets tutorial" for some further examples.