Handling of Hibernate Report Queries leads to ClassCastExceptions
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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
Assigned to: Chad Brandon
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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