code: private void registerConverterInstance(Class<?> valueType, Converter converter)
    {
      if(converters.put(valueType, converter) == null) {
        log.debug("Register converter |%s| for value type |%s|.", converter.getClass(), valueType);
      }
      else {
        log.warn("Override converter |%s| for value type |%s|.", converter.getClass(), valueType);
      }
    }
docs: Utility method to bind converter instance to concrete value type.
  
  @param valueType concrete value type,
  @param converter converter instance able to handle value type.