throw new SubjectNotFoundException(ERR_SNU + id);
throw new SubjectNotFoundException(E.SF_SNU + id);
  public static Subject findById(String id)     throws SubjectNotFoundException  {    List subjects  = SubjectFinder._findById(      id, MGR.getSources().iterator()    );    if (subjects.size() == 1) {      return (Subject) subjects.get(0);    }    else if (subjects.size() > 1) {      throw new SubjectNotFoundException(ERR_SNU + id);     }    throw new SubjectNotFoundException(ERR_SNF + id);  } 