eu fiz tudo correto mais continua dando erro 4004
package br.com.alura.gerenciador.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet(urlPatterns="/oi")
public class OiMundoServlet extends HttpServlet{
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws IOException {
PrintWriter out = resp.getWriter();
out.println("<html>");
out.println("<body>");
out.println("<oi mundo, deu certo finalmente>");
out.println("</body>");
out.println("</html>");
}
}