Oracle user password expired

Modify the default user profile to set the password policies to 'UNLIMITED':

ALTER PROFILE DEFAULT LIMIT COMPOSITE_LIMIT UNLIMITED

  PASSWORD_LIFE_TIME UNLIMITED

  PASSWORD_REUSE_TIME UNLIMITED

  PASSWORD_REUSE_MAX UNLIMITED

  PASSWORD_VERIFY_FUNCTION NULL

  PASSWORD_LOCK_TIME UNLIMITED

  PASSWORD_GRACE_TIME UNLIMITED

  FAILED_LOGIN_ATTEMPTS UNLIMITED;