[ http://jira.andromda.org/browse/SPRING-84?page=all ]
David Allen updated SPRING-84:
------------------------------
Attachment: dao-patch.txt
> Handling of Hibernate Report Queries leads to ClassCastExceptions
> -----------------------------------------------------------------
>
> Key: SPRING-84
> URL: http://jira.andromda.org/browse/SPRING-84
> Project: Spring Cartridge
> Type: Bug
> Versions: 3.1M1
> Environment: AndroMDA setup including Spring and Hibernate cartridge,
> modelling done by Together and own XMI-exporter, Windows XP, generation via
> ANT-task
> Reporter: Dirk Rademann
> Assignee: Chad Brandon
> Attachments: dao-patch.txt
>
> By using Hibernate report queries like
> select entity.property1, entity.property2
> from SomeEntityImpl entity
> where entity.id = ?
> the Spring Cartridge generates code (...DaoBase) that tries to cast the
> result of the query into the given entity class, in the example given above
> that would be like
> ...
> java.util.List results = queryObject.list();
> result = (SomeEntityImpl)results.iterator().next();
> resulting in a ClassCastException cause the query returns an Object[] with
> two values (property1 and property2), not an entity. The entity itself is
> connected to a tagged <<ValueObject>> and the transform methods are also
> generated and implemented:
> to<name of value object>(SomeEntityImpl entity) and(!)
> to<name of value object>(Object[] entity)
> That means that the transform methods are generated correctly already and if
> I use a finder with the specific constant for a value object transformation
> the code should call the
> to<name of value object>(Object[] entity)
> method prior to doing anything else like it is already doing for Collections
> of entites which are transformed into value objects. Currently you can't use
> Hibernate report queries that return one single row. Only workaround at the
> moment is to use a Collection as return value.
> regards,
> Dirk Rademann
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