Hello,
I'm trying to map classes on multiple joined tables as described in OJB tutorial.
This is my situation: I have a class A that extends a class B that in turn extends a
class C that extends a fourth class D. In the classes A, B and C there is an attribute
referring to the super class's primary key. The referene descriptor look like:
<reference-descriptor name ="super"
class-ref="pack.B"
auto-retrieve="true"
auto-update="true"
auto-delete="true"
>
<foreignkey field-ref="bid"/>
</reference-descriptor>
my application correctly saves the data on the database, but when querying for read, I
get a NullPointerException. I don't understand why!!!! Any help would be very
appreciated.
Best regards,
Ilaria.
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