fetch = FetchType.EAGER
@ManyToOne
, @OneToOne
은 EAGER이 defaultfetch = FetchType.LAZY
@OneToMany
, @ManyToMany
는 LAZY가 defaultcascade = CascadeType.PERSIST
: 저장cascade = CascadeType.REMOVE
: 삭제orphanRemoval = true
cascade = CascadeType.ALL
+ orphanRemoval = true