Hibernate version: 3.2.5

I am trying to map two classes to the same table and it works fine. Is this not a problem? Shouldn't I be getting some kind of a Duplicate Mapping Exception?

Thanks,
Bijal

It's fine.



Farzad-

Well the reason why I question this is because when I tried to do this with a subclass it does throw a Duplicate Mapping Exception. Let me explain a bit further:

Scenario A:
<class name="ClassA" table="table_a">
...
</class>

<class name="ClassB" table="table_a">
...
</class>


Scenario B:
<class name="ClassA" table="table_a">
...
</class>

<class name="ClassB" abstract="true">
<union-subclass name="ClassC" table="table_a">
...
</union-subclass>
</class>

Scenario 2 throws a Dupplicate Mapping Exception, but Scenario A works fine. Whats the difference? Why doesn't Scenario B work?

Thanks,
Bijal

the semantics are different here. Read hibernate documentation for an explanation of union subclass. In case of regular mapping imagine this scenario: There is ClassA and There is ClassAForListing which has less fields and probably no association and is good for a specific screen that shows a list of instances. Then it perfectly makes sense to need to maps a table more than once but one need to be more cautious not violate any data integrity of any kind because hibernate in these cases can guarantee less things.



Farzad-