[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5390) Index column on inverse List should throw a warning

[Jaroslaw Lewandowski (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=39106#action_39106 ] 

Jaroslaw Lewandowski commented on HHH-5390:
-------------------------------------------

The Hibernate documentation http://docs.jboss.org/hibernate/core/3.6/reference/en-US/html/collections.html#collections-indexed is very similar example as the one here but in contrast it's actually valid one. JPA 2.0 does not mention anything about such restriction.

> Index column on inverse List should throw a warning
> ---------------------------------------------------
>
>                 Key: HHH-5390
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5390
>             Project: Hibernate Core
>          Issue Type: Improvement
>          Components: annotations
>    Affects Versions: 3.5.3
>            Reporter: Chris Bredesen
>
> The manual correctly warns against trying to map an indexed inverse collection on a List.  However, a configuration containing this invalid mapping builds successfully but causes null values to be inserted for the index column.
> Hibernate should be helpful and, if possible, throw a warning to the user (perhaps an error?) that explains the invalid combination.  Here is an example that would run but produce invalid results:
> {code}
> @Entity
> public class Parent {
>     @OneToMany(mappedBy="parent")
>     @OrderColumn(name="order")
>     private List<Child> children;
> }
> @Entity
> public class Child {
>     @ManyToOne
>     private Parent parent;
> }
> {code}
> The above is a typical one to many with the addition of @OrderColumn.  Because Child owns the relationship, the index column is lost/ignored.  Hibernate should warn about this. 

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