GAE-java: Get started

package guestbook;

import java.io.IOException;

import javax.servlet.http.*;

@SuppressWarnings("serial")

public class GuestbookServlet extends HttpServlet {

public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {

resp.setContentType("text/plain");

resp.getWriter().println("Hello, world2");

}

}