What need to do when encounter the error ORA-28001: the password has expired

 When you encounter the error ORA-28001: the password has expired, execute below queries to resolve this.

export ORACLE_SID=<databaseName>

sqlplus / as SYSDBA

SQL> alter profile default limit password_life_time unlimited;

SQL> alter user <userName> identified by <password>;

SQL> commit;

SQL> exit;