REST Springboot tutorial

me.namila.RestSpringTest.Model.book.java

@Data
@AllArgsConstructor
@NoArgsConstructor
@Entity
@Table(name = "book")
public class Book implements Serializable
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;

    @Column(name = "name")
    @NotNull
    private String name;

    @ManyToOne( fetch = FetchType.LAZY, cascade = CascadeType.PERSIST)
    @JoinColumn(name = "author_id", nullable = false)
    //@JsonBackReference("author")
    private Author author;

    @ManyToOne( fetch = FetchType.LAZY, cascade = CascadeType.PERSIST)
    @JoinColumn(name = "publisher_id", nullable = false)
    //@JsonBackReference("publisher")
    private Publisher publisher;

    @NotNull
    @Column(name = "price")
    private double price;
}