springboot中，jdbc连接数据库，为什么经常出现第一次连接不上，第二次后就可以正常连接，第一次报错如下？

the last packet sent successfully to the server was 0 milliseconds ago. 

    private Connection getConnection() throws ClassNotFoundException, SQLException {
        // 黄岛冰酒数据库
        String url = "jdbc:mysql://ip:3306/data1?useUnicode=true&characterEncoding=UTF8&serverTimezone=Asia/Shanghai";
        //驱动
        String name = "com.mysql.cj.jdbc.Driver";
        String user = "abc";
        String password = "abc2022";
        Connection conn = null;
        // 指定连接类型
        Class.forName(name);
        // 获取连接
        conn = DriverManager.getConnection(url, user, password);
        return conn;
    }