code: public static List getAllPossibleLevels() {
          ArrayList list = new ArrayList();
          list.add(FINE);
          list.add(FINER);
          list.add(FINEST);
          list.add(INFO);
          list.add(CONFIG);
          list.add(WARNING);
          list.add(SEVERE);
          return list;
      }
docs: Gets list of supported levels.
  @return  list of supported levels.