[hibernate-issues] [Hibernate-JIRA] Closed: (HHH-2711) PropertyAccessException with backref and <composite-map-key/>

[Steve Ebersole (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2711?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Ebersole closed HHH-2711.
-------------------------------

    Resolution: Fixed

> PropertyAccessException with backref and <composite-map-key/>
> -------------------------------------------------------------
>
>                 Key: HHH-2711
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2711
>             Project: Hibernate3
>          Issue Type: Bug
>          Components: core
>            Reporter: Steve Ebersole
>            Assignee: Steve Ebersole
>            Priority: Minor
>             Fix For: 3.2.5, 3.3
>
>
> Background ~~~~~~~~~~~
> Whenever you map a one-to-many association unidirectionally from the many side, with the collection-key (FK) being defined as not-null, Hibernate creates a special property (PropertyAccessor) on the related entity which is used to determine the FK value.
> ~~~~~~~~~~~~~~~~~~~~
> Currently, this causes problems in a few scenarios if that collection is a map and a <composite-map-key/> is used instead of a simple <map-key/>.
> The trivial workaround is to specify that the map keys be nullable.
> The fix is to have Hibernate either:
> 1) not attempt to access component sub-values from when the component instance == BrackrefPropertyAccessor.UNKNOWN;
> 2) have BrackrefPropertyAccessor be more aggressive in terms of trying to resolve the <composite-map-key/> in the first place.
> #1 is definitely the way to go in terms of performance.  But it might mean needing to do that check in a few different places...

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