ORACLE ERROR: ORA-28000: The account is locked

One of my colleagues is getting the following error when tried to logging into a business object which using oracle database, and got this error. Finally a quick web search gave the solution.

Cause: The user has entered wrong password consequently for maximum number if times specified by the user’s profile parameter FAILED_LOGIN_ATTEMPTS or the DBA has locked the account

Action: Wait for PASSWORD_LOCK_TIME or contact DBA

DBA must unlock these accounts to make them available to users. Look at the script below to unlock a user:

ALTER USER ejuly ACCOUNT LOCK    -- lock a user account

But do take note with a case-sensitive name. Look at the script below then you can see the different more clearly.

SQL> create user "ejuly" identified by ejuly account lock;
User created.

SQL> select username, account_status from dba_users where username='ejuly'; 
USERNAME          ACCOUNT_STATUS
----------------- ---------------------
ejuly             LOCKED

SQL> alter user ejuly account unlock; 
alter user ejuly account unlock
           *
ERROR at line 1: 
ORA-01918: user 'EJULY' does not exist

SQL> alter user "ejuly" account unlock; 
User altered.

SQL>