petclinic spring
https://atoz-develop.tistory.com/entry/Spring-%EC%8A%A4%ED%94%84%EB%A7%81-%EC%98%88%EC%A0%9C-%ED%94%84%EB%A1%9C%EC%A0%9D%ED%8A%B8-PetClinic-%EB%B9%8C%EB%93%9C-%EB%B0%8F-%EC%8B%A4%ED%96%89%ED%95%98%EA%B8%B0
