这是我的代码。
@Entity
public class Book {
@Id
@GeneratedValue
private String isbn;
private String title;
private Double price;
@ManyToMany
List <Author> authors= new ArrayList<>();
请问该错误的原因是什么？
Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist: library.Book
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:124)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:58)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:780)
... 2 more