Column index not populated?

[Nicklas Karlsson]

I've been following the example in "2.4.6.2.3. Bidirectional association with indexed collections" but I still don't get any population of the index column, any suggestions would be appreciated:

@Entity
public class Parent {
   @Id
   @GeneratedValue
   private int parentId;

   @OneToMany(mappedBy = "parent", cascade = CascadeType.ALL)
   @Cascade(org.hibernate.annotations.CascadeType.DELETE_ORPHAN)
   @org.hibernate.annotations.IndexColumn(name = "childOrder")
   private List<Child> children = new ArrayList<Child>();
...
}

@Entity
public class Child {
   @Id
   @GeneratedValue
   private int id;

   private int childOrder;

   @ManyToOne
   @JoinColumn(name = "parentId", nullable = false)
   private Parent parent;
...
}

I can't see where I'm going wrong. The childOrder exists so mappedBy can be used on the parent side, right?
(I also posted this on the hib forums but as your slogan says, you have a tendency of being more friendly over here)

[Nicklas Karlsson]

OK, gave up on the mappedBy and went for joincolumns and that seemed to work. Now for the next step, composite keys, I modifed the example as

@Entity
public class Parent {
	@Id
	private ParentId parentId;

	@OneToMany(cascade = CascadeType.ALL)
	@Cascade(org.hibernate.annotations.CascadeType.DELETE_ORPHAN)
	@org.hibernate.annotations.IndexColumn(name = "childOrder", base=1)
	@JoinColumn(name="parentName", nullable=false)
	private List<Child> children = new ArrayList<Child>();
...

@Embeddable
public class ParentId implements Serializable {
	private String parentName;
...
}

@Entity
public class Child {
	@Id
	private ChildId childId;

	@ManyToOne
	@JoinColumn(name = "parentName", nullable = false, insertable=false, updatable=false)
	private Parent parent;

@Embeddable
public class ChildId implements Serializable {
	private String childName;
	@Column(insertable=false, updatable=false)
	private int childOrder;
...
}

The problem is that I'm trying to get it to work against a legacy schema and I have uses for the childOrder so I'd like it to be part of the key but I get a

Repeated column in mapping for entity: hib.Child column: childOrder (should be mapped with insert="false" update="false")

even If I try to do so in the embedded key. Can't the column index be pointed against a column/property that is "non-synthetic"?

Suggestions appreciated