@OneToMany and composite primary keys?

Question

I\'m using Hibernate with annotations (in spring), and I have an object which has an ordered, many-to-one relationship which a child object which has a composite primary key

Answer 1

It seems that you got pretty close, and I am trying to do the same thing in my current system. I started with the surrogate key but would like to remove it in favor of a composite primary key consisting of the parent's PK and the index in the list.

I was able to get a one-to-one relationship that shares the PK from the master table by using a "foreign" generator:

@Entity
@GenericGenerator(
    name = "Parent",
    strategy = "foreign",
    parameters = { @Parameter(name = "property", value = "parent") }
)
public class ChildObject implements Serializable {
    @Id
    @GeneratedValue(generator = "Parent")
    @Column(name = "parent_id")
    private int parentId;

    @OneToOne(mappedBy = "childObject")
    private ParentObject parentObject;
    ...
}

I wonder if you could add the @GenericGenerator and @GeneratedValue to solve the problem of Hibernate not assigning the parent's newly acquired PK during insertion.