if (creator == null) { creator = this.getCreator_id().getSubject();
if (this.creator == null) { this.creator = this.getCreator_id().getSubject();
  public Subject getCreateSubject()     throws SubjectNotFoundException  {    if (creator == null) {      creator = this.getCreator_id().getSubject();    }    return creator;   } // public Subject getCreateSubject() 