I just used the new inheritance feature of EJB3 with the
InheritanceType.SINGLE_TABLE strategy. There is a column for the type of the
entity and each entity has a @DiscriminatorValue.
My entities are like:
| @Entity
| @DiscriminatorColumn(name = "INHERITANCETYPE", discriminatorType =
DiscriminatorType.STRING)
| @DiscriminatorValue("Partner")
| public class Partner ...
|
| @Entity
| @DiscriminatorValue("NaturalPerson")
| public class NaturalPerson extends Partner ...
| protected String attributeOnlyInNaturalPerson;
|
I have another entity with a relation to a Partner entity (1-n-relation, so
that a collection of Partner is returned.
If I call myEntity.getPartner():Collection<Partner>, I will get entites of type
Partner. In the debugger, I can see that the attribute
attributeOnlyInNaturalPerson is loaded from the database and instanciated to
the object, BUT if I try to typecast the object to NaturalPerson, I get an
ClassCastException.
My current work around is to EntityManger.find(NaturalPerson.class, id) the
entity again (this works) but I think this is a performance problem...
Am I doing anything wrong with inheritance and relations, or is this really a
bug?
Best regards
Carsten
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