code: protected final Object mapLookup(Map map, Object key) {
          LOGGER.trace("get value from Map");
          return map.get(key);
      }
docs: Lookup the <code>key</code> in the <code>map</code>.
  @param map the map
  @param key the key
  @return the value found at <code>map.get(key)</code> or <code>null</code> if no value was found