code: public Object get(String key) {
      if (!StringUtil.isEmpty(key)) {
        if (pendingInstanceData.containsKey(key)) {
          return pendingInstanceData.get(key);
        }
        if (instanceData.containsKey(key)) {
          return instanceData.get(key);
        }
      }
      return null;
    }
docs: Access a value
  @param key
  @return