ORA-28001: password has expired

When Oracle12c creates a user, the default password expiration limit is 180 days (that is, 6 months). If the user password is not changed for more than 180 days, the user cannot log in. 
Oracle introduced this default function in 12c by default for database security, but this default function is easily overlooked by DBAs or developers. Once the password has not been changed for 180 days, such a problem will occur.

Method 1: Oracle SQL Developer

SELECT * FROM dba_profiles WHERE profile='DEFAULT' AND resource_name='PASSWORD_LIFE_TIME';