MYSQL ERROR 1862 (HY000): Your password has expired.

在IDEA里面遇到错误：

The specified user/password combination is rejected:

[HY000][1862] Your password has expired.
To log in you must change it using a client that supports expired passwords.

原因是：

MySQL 5.7.16 introduces password-expiration capability, to enable database administrators to expire account passwords and require users to reset their password. 

所以只需重新修改下密码即可，修改方式如下：

以root权限登录mysql：（这里我的账户是root，密码也是root）

mysql -u root -p

然后输入自己的密码，之后：

SET PASSWORD = PASSWORD('root');

OK,可以正常使用了。