1. 엔티티@Entity@Getter@NoArgsConstructor@AllArgsConstructor@Builderpublic class Post { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name = "post_id") private Long id; @Column(nullable = false) private String content;} @Entity@Getter@NoArgsConstructor@AllArgsConstructor@Builderpublic class Comment { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) ..