code: public static synchronized JGrassGears getInstance() {
          if (jgrassGears == null) {
              jgrassGears = new JGrassGears(null);
              jgrassGears.gatherInformations();
          }
          return jgrassGears;
      }
docs: Retrieves the {@link JGrassGears}. If it exists, that instance is returned.
  
  @return the JGrassGears annotations class.