docs: @Override
  	public Map<String, Object> getAttributesMap() {
  		@SuppressWarnings("unchecked")
  		Map<String, Object> threadAttributesMap = (Map<String, Object>)getAttribute(FLASH_ATTRIBUTES_MAP);
  		if(threadAttributesMap == null) {
  			threadAttributesMap = new FlashAttributesMap();
  			putAttribute(FLASH_ATTRIBUTES_MAP, threadAttributesMap);
  		}
  		return threadAttributesMap;
  	}