[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-1109) composite-key does not support null-values

[Thijs Thiessens (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-1109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=34107#action_34107 ] 

Thijs Thiessens commented on HHH-1109:
--------------------------------------

This bug still exists in 3.3.1. Why is the resolution of this issue rejected? Is their any workaround known? Is anyone working on a patch? 

> composite-key does not support null-values
> ------------------------------------------
>
>                 Key: HHH-1109
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1109
>             Project: Hibernate Core
>          Issue Type: Bug
>    Affects Versions: 3.0.5
>         Environment: [org.hibernate.type.EmbeddedComponentType.hydrate(...)#425]
>            Reporter: Holger Bartnick
>   Original Estimate: 1 day
>  Remaining Estimate: 1 day
>
> At present all legacy data with null-values in its composite-key could not be read properly by hibernate.
> While hibernate processes the resultset it returns null for that record and steps over to the next one.
> Think of a db-view, which combines two (or more) tables by outer-join.
> (that seems only necessary for crude legacy data indeed... but it´s not that unusual as you think)
> The workaround is to use a db-generated identifier for each view-record (ex. combining the nullable-id fields).
> It would be fine, if hibernate is not reliant on that. ;-)
> To allow having composite-keys with partly null-Values, you could think of moving the "unsaved-value"-attribute 
> of the "composite-key"-tag to "key-property|key-many-to-one"-Tags...?!
> ---
> Mmmh... saw you´ve done something with "columnNullness" in ver 3.1beta2. Perhaps it is fixed in there...
> also seen on HB-613 

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