Author entity fof a one to many bidirectional relationship

Author.java

@Entity
@Table(name = "Author")
public class Author implements Serializable {

    @Column(name = "ID", nullable = false, length = 10)
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Column(name = "FirstName")
    @NotBlank(message = "Enter the author's first name")
    public String firstName;

    @Column(name = "LastName")
    @NotBlank(message = "Enter the author's last name")
    public String lastName;


    @OneToMany(mappedBy = "author", fetch = FetchType.LAZY)
    private Set<Book> books = new HashSet<>();

    public Author() {
    }
    
    //getters and setters omitted for brevity
}