406 error
https://itcrowd2016.tistory.com/63
pojo
https://siyoon210.tistory.com/120
JunitTest
https://codevang.tistory.com/259
Spring MVC basic
https://codevang.tistory.com/category/%E2%96%B8Spring%20MVC
library와 Framework의 차이점
https://webclub.tistory.com/458