[hibernate-issues] [Hibernate-JIRA] Commented: (ANN-562) CLONE -Discriminator column not supported with JOINED strategy: another reason

[Emmanuel Bernard (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/ANN-562?page=comments#action_26289 ] 

Emmanuel Bernard commented on ANN-562:
--------------------------------------

SINGLE_TABLE + SecondaryTables lead to the same underlying relational model than the one you want to target

> CLONE -Discriminator column not supported with JOINED strategy: another reason
> ------------------------------------------------------------------------------
>
>          Key: ANN-562
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-562
>      Project: Hibernate Annotations
>         Type: Bug

>     Versions: 3.1beta6
>  Environment: Hibernate 3.1rc2, Hibernate Annotations 3.1b6
>     Reporter: Amit Kasher

>
>
> Section 9.1.27 of the EJB3 persistence public draft says, "The DiscriminatorColumn annotation is used to define the discriminator column for SINGLE_TABLE and JOINED mapping strategies." But Hibernate ignores the DiscriminatorColumn annotation when the mapping strategy is JOINED; when a JOINED entity is persisted, its discriminator column is not included in the SQL "insert" statement, resulting in a not-null constraint violation if the discriminator column is marked NOT NULL in the database.
> The JOINED strategy with discriminators is pretty ubiquitous in EJB3 sample code and tutorials out on the net, so lots of people are likely to run into this as they try out EJB3 for the first time. A few examples:
> http://www.oracle.com/technology/tech/java/oc4j/ejb3/howtos-ejb3/howtoejb30inheritance/doc/how-to-ejb30-inheritance.html
> http://www.solarmetric.com/Software/Documentation/4.0.0EA/docs/full/html/ejb3_overview_mapping_discrim.html
> http://www.caucho.com/resin-3.0/amber/tutorial/cmp-inherit/index.xtp

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