[Hibernate-issues] [Hibernate-JIRA] Updated: (HHH-1621) subclass mapping by discriminator - should instantiate parent for unmapped discriminator values

[Martin S. (JIRA) <no...@at...>]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-1621?page=all ]

Martin Schulz updated HHH-1621:
-------------------------------

    Attachment: HHH-1621

Patch

> subclass mapping by discriminator - should instantiate parent for unmapped discriminator values
> -----------------------------------------------------------------------------------------------
>
>          Key: HHH-1621
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1621
>      Project: Hibernate3
>         Type: Improvement

>   Components: core
>  Environment: 3.1.2
> Sybase ASE 12.5.3
>     Reporter: Martin Schulz
>  Attachments: HHH-1621
>
>
> Scenario:  The parent class A has a discriminator field and some but all possible scriminator values are mapped to subclasses.
> Current behavior:
> 1) Default:
> The following exception is thrown
> org.hibernate.WrongClassException: Object with id: 10000 was not of the specified subclass: A (Discriminator: D)
> 	at org.hibernate.loader.Loader.getInstanceClass(Loader.java:1445)
> [ the error itself is also quite misleading, as the row is exactly of / for the specified class A. But there simply was no
>   subclass found ].
> 2) discriminator with force="true"
> The parent class is never instantiated, only the mapped subclasses are instantiated.
> Proposed behavior:
> The parent class should be instantiated for those rows with unmapped discriminator values.
> Characteristics of proposed behavior:
> - all rows in resultset would lead to instantiated class in the inheritence tree,
> - the behavior would be in line with how joined-subclass behaves
> - no caveat documentation required
> Implementation:
> (Easy)
> in Loader.java, lines 1443ff, do not throw WrongClassException, but instead 
> return persister.getEntityName();
> (Alternate)
> change persister.getSubclassForDiscriminatorValue() implementations correspondingly.
> Thx for your consideration / vote.

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