[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-772) null in maps are handled inconsistently

[Nelson Murphy (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=32034#action_32034 ] 

Nelson Murphy commented on HHH-772:
-----------------------------------

I just encountered this problem as well.

An entry with a null value is entirely different from the absence of an entry (i.e., absence of the key).  I have seen no rational explanation for PersistentMap's implementation.

Would someone on the Hibernate team please explain why "A 'sane' schema does not have 'null values in a map'"?  I could understand not supporting a null key, but what is wrong with a null value?

> null in maps are handled inconsistently
> ---------------------------------------
>
>                 Key: HHH-772
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-772
>             Project: Hibernate Core
>          Issue Type: Improvement
>          Components: core
>            Reporter: Max Rydahl Andersen
>             Fix For: 3.1 beta 1
>
>
> regarding case 00004729.
> group.getUsers().put("something", null);
> Does not result in any insert.
> Inserting "something", null manually into the underlying table and
> when hibernate reads the map will have "something"->null in the map.

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