https://meetup.toast.com/posts/223

https://kapentaz.github.io/java/Java-Bean-Validation-%EC%A0%9C%EB%8C%80%EB%A1%9C-%EC%95%8C%EA%B3%A0-%EC%93%B0%EC%9E%90/#

https://medium.com/@gaemi/java-%EC%99%80-spring-%EC%9D%98-validation-b5191a113f5c