Just reading the EJB3 persistence spec and would like to get some knowledgeable
confirmation that my understanding is correct:
AFAIK if I have a unidirectional many-to-many relationship from A to B, so A has
a collection of Bs in my object model, there's no way in the current JPA spec to
cater for mapping an extra value from the join table onto my B object.
The more I think about how it might be implemented behind the scenes, the more I
think it is probably rife with impossible requirements, but I thought I'd ask.
Alternatively I guess I could map the join table to a new object C which has the
property / extra value, and to make coding against it easier, give it
pass-through getters and setters for the B object's properties.
How have others approached this?
Regards
Adam
