My code to test db connection from eclipse is given below

导入java.io.ioexception；导入java.io.printwriter；

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.*;

@WebServlet("/TestDbServlet")
public class TestDbServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String user="user01";
        String pass="pass01";
        String jdbcUrl = "jdbc:mysql://localhost:3306/web_customer_tracker?useSSL=false&serverTimezone=UTC";
        String driver = "com.mysql.cj.jdbc.Driver";

        // get connection to database
        try {
            PrintWriter out = response.getWriter();

            out.println("Connecting to database: " + jdbcUrl);

            Class.forName(driver);

            Connection myConn = DriverManager.getConnection(jdbcUrl, user, pass);

            out.println("SUCCESS!!!");

            myConn.close();

        }
        catch (Exception exc) {
            exc.printStackTrace();
            throw new ServletException(exc);
        }

    }

当我在服务器上运行时，我收到404错误。我已经使用tomcat9和java14将mysql-connector-java8.0.11.jar添加到webinf.am的lib文件夹中。