[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2235) Support for null map-keys in <map> mappings

[Ulf gohde (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_27256 ] 

Ulf gohde commented on HHH-2235:
--------------------------------

Obviously you need a primary key if you want to use it in a relation via foreign key. The table in that example has no relation to other tables...

"You can't identify what you don't know". What are you talking about? If I know that a column can have a null value, then I know it. The example is not broken

Given the above example data like below is completely valid and the first 2 columns are uniquely identifying a row.
1     released      blob
1     draft              another blob
2     null                yet another blob

> Support for null map-keys in <map> mappings
> -------------------------------------------
>
>                 Key: HHH-2235
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2235
>             Project: Hibernate3
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.2.0.ga
>            Reporter: Igor Lobanov
>            Priority: Minor
>
> I'm not sure if I should file it as a bug.
> Hibernate requires index column for <map> mappings to be not null. This is required by the code in AbstractCollectionPersister#readIndex(...), which raises exception if index column is null. However, when I override collection persister and force readIndex method to return null, everything seems to work fine. Hibernate allows me to work with maps using null value as a key. Though I havn't tested it extensivly yet.
> What is the reason for disallowing null values as a keys? If there are possible complicated error conditions, then this issue is a feature request for null-values support for <map> mappings. If there are no errors possible, then constraining such behavior is probably wrong. 

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