You're using kind information with an easy request param, that's not how it works. If you are trying to send the json and file together, ensure "childFile"'s written content form is "software/json" and receive it by ask for entire body with annotation @RequestPart, and mapping generates needs to be "multipart/form-information", https://loan-like-upstart37036.snack-blog.com/36898378/details-fiction-and-400-cash