code: public void clearCacheIncludingAncestors() {
  		clearCache();
  		if (getParentMessageSource() instanceof ReloadableResourceBundleMessageSource) {
  			((ReloadableResourceBundleMessageSource) getParentMessageSource()).clearCacheIncludingAncestors();
  		} else if (getParentMessageSource() instanceof org.springframework.context.support.ReloadableResourceBundleMessageSource) {
              ((org.springframework.context.support.ReloadableResourceBundleMessageSource) getParentMessageSource()).clearCacheIncludingAncestors();
  		}
  	}
docs: Clear the resource bundle caches of this MessageSource and all its ancestors.
  @see #clearCache