unidirectional one-to-many relation without join table

@Entity
@Table
public class Book {

    @Id @GeneratedValue @Column private Long bookId;

    @Column private String name;

    @OneToMany(cascade=CascadeType.ALL,fetch=FetchType.EAGER)
    @JoinColumn(name="bookId")
    private List<Chapter> 开发者_开发百科chapters=new ArrayList<Chapter>();
.....

@Entity
@Table
public class Chapter {

    @Id @Column @GeneratedValue
    private Long cid;

    @Column private String name;

    @Column private Long bookId;
....

What annotation should I use in Chapter.bookId to refer Book.bookId, so that chapter.bookid will take the generated value of Book.bookId while inserting a new Book .

    Book bk=new Book();
    bk.setName("b1");

    Chapter ch=new Chapter();
    ch.setName("b1c1");
    bk.getChapters().add(ch);

I get this error Hibernate: insert into Book (name) values (?) Hibernate: insert into Chapter (bookId, name) values (?, ?) 19:56:59,094 ERROR JDBCExceptionReporter:234 - Column 'bookId' cannot be null

You'd have to set Chapter.bookId yourself or change the reference in Chapgter from Long to Book, add the @ManyToOne annotation and set the reference to the book manually.

In this case, the owning side of the relation is actually Chapter, i.e. a chapter defines which book it belongs to.

Use @Column(nullable=true) if you really need null value, otherwise as have been said in previous answer - you need to set it manually, adding Chapter to list doesn't set bookId