Fix the error ORA-28002: the password will expire within 7 days

ORA-28002: the password will expire within 7 days
Cause: The user's account is about to about to expire and the password needs 
to be changed.
Action: Change the password or contact the database administrator.

Reference: Oracle Documentation 

Solutions:

1) Simply change the password to avoid it temporary

  [oracle@lnxsvr ~]$ sqlplus scott/tiger

  SQL*Plus: Release 11.2.0.1.0 Production on Wed Jun 20 14:08:01 2012

  Copyright (c) 1982, 2009, Oracle.  All rights reserved.

  ERROR:
  ORA-28002: the password will expire within 7 days

  Connected to:
  Oracle Database 11g Release 11.2.0.1.0 - 64bit Production

  SQL> PASSWORD
  Changing password for SCOTT
  Old password:
  New password:
  Retype new password:
  Password changed