JPA - OneToOne Foreign key as primary key

问题

I have a table which requires its primary key as a foreign key to other table, so an unidirectional one-to-one relationship. There will be only an author per book, like this:

@Entity
public class Author {
    @Id
    String code;

    //getters and setters ...
}


@Entity
public class Book {
    @Id
    @OneToOne
    @JoinColumn(name="code", columnDefinition="DOM_COD5")
    Author author;

    //getters and setters
}

With plain Hibernate and JPA annotations it works well, but using using it through Spring Data I keep getting this error:

Caused by: java.lang.IllegalArgumentException: This class [class com.xxxx.api.catalogo.domain.Book] does not define an IdClass  

回答1:

Try this way

@Entity
public class Book {

    @Id
    @OneToOne
    @PrimaryKeyJoinColumn
    Author author;

    ...
}

来源：https://stackoverflow.com/questions/35409656/jpa-onetoone-foreign-key-as-primary-key