자바의 정석 7장. 객체지향 프로그래밍 II

@MappedSuperclass
@EntityListeners(AuditingEntityListener.class)
public class BaseEntity {
    @Id
    @GeneratedValue
    private Long id;
		@CreatedBy
    private String regUserId;
		@LastModifiedBy
    private String modUserId;
		@CreatedDate
    private Date regDate;
		@LastModifiedDate
    private Date modDate;
    @Version
    private Integer version;
}

@Entity
public class File extends BaseEntity {
    private String name;
    private String content;
}