[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5308) hibernate cannot handle Inheritance, if the discriminatorColumn is part of a composite pk in a @MappedSupperclass

[Cédric Dupui (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=44663#comment-44663 ] 

Cédric Dupui commented on HHH-5308:
-----------------------------------

Hi all,
Is there a workaround for this bug ?
Tkx

> hibernate cannot handle Inheritance, if the discriminatorColumn is part of a composite pk in a @MappedSupperclass
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: HHH-5308
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5308
>             Project: Hibernate Core
>          Issue Type: Bug
>    Affects Versions: 3.5.2
>         Environment: Linux, Java 6
>            Reporter: AndyW
>         Attachments: jpatest_hibernate_aktuell.zip
>
>
> Hi, 
> i am having the following mapping structure
> @MappedSuperclass
> LadeeinheitEinausgaenge 
>  |  @Entity
>  |  @Inheritance(strategy=InheritanceType.SINGLE_TABLE)
>  |  @DiscriminatorColumn(name = "LAEA_TYP")
>  |  @Table(name = "LADEEINHEIT_EINAUS")
>  +- AbstractEinAusgang
>  |      |  @DiscriminatorValue("AUSGANG")
>  |      |  @Entity
>  |      +- LadeeinheitAusgaenge
>  |      |  @DiscriminatorValue("EINGANG")
>  |      |  @Entity
>  |      +- LadeeinheitEingaenge
> The composite pk is defined in the MappedSuperclass. The discriminator column
> is part of the composite pk. when i start my app, i am getting the following error:
> > Repeated column in mapping for entity: de.dbsystel.gate.integration.model.LadeeinheitAusgaenge column: LAEA_TYP (should be mapped with insert="false" update="false")
> the error message is kind of misleading, because the @DiscriminatorColumn annotation only defines which column to use for the mapping, i guess. however the actual mapping is defined in the MappedSuperclass.
> When moving the @DiscriminatorColumn to the mappedSuperclass, hibernate does not complain when starting,
> but then it creates tables, it create the default DiscriminatorColumn named DTYPE, which is not wanted, because i explicitly defined a discriminator column. If the discriminator column is defined in the mappedSuperclass then it will be ignore. if it is defined in my abstract base entity. then i get the error mentioned above. 
> My Intention is to query the AbstractEinAusgang and get one of the two possible concrete
> classes, that are defined via the discriminator value.
> i have attached the testcase that shows the problem.
> cheers,
> andy

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