code: public MultipartConfigType<ServletType<T>> getOrCreateMultipartConfig()
     {
        Node node = childNode.getOrCreate("multipart-config");
        MultipartConfigType<ServletType<T>> multipartConfig = new MultipartConfigTypeImpl<ServletType<T>>(this, "multipart-config", childNode, node);
        return multipartConfig;
     }
docs: If not already created, a new <code>multipart-config</code> element with the given value will be created.
  Otherwise, the existing <code>multipart-config</code> element will be returned.
  @return  a new or existing instance of <code>MultipartConfigType<ServletType<T>></code>