code: private void loadEquivalencingEngine() throws EquivalencerException {
          if (paramEquivalencer == null) {
              try {
                  paramEquivalencer = DefaultParameterEquivalencer.getInstance();
              } catch (Exception e) {
                  throw new EquivalencerException(
                          "Unable to load equivalencing engine.", e);
              }
          }
      }
docs: Loads the {@link ParameterEquivalencer} if it has not already been
  loaded.
  
  @throws EquivalencerException Thrown if an error occurred loading the
  equivalencing engine.