Hibernate version: 2.1
Name and version of the database you are using: Oracle 9i


Hi

I have 3 tables defined in Oracle database called, Table A, B and C. Each of them have primary key called a_id, b_id and c_id. There is a joint table defined called ABC which has composite key made up of 3 primary keys: a_id, b_id, c_id. There is no other column defined in table ABC. I am getting can not insert null exceptions while I am saving the object A.

Here are my definitions:

<table name="A" />
<table name="B" />
<table name="C" />


<many2many>
<tablea name="A" />
<jointable name="ABC" generate="false" />
<tableb name="B" />
</many2many>

<many2many>
<tablea name="B" />
<jointable name="ABC" generate="false" />
<tableb name="C" />
</many2many>

<many2many>
<tablea name="A" />
<jointable name="ABC" generate="false" />
<tableb name="C" />
</many2many>


Can anyone please tell me what is wrong and what are alternates ?

Thank you.
Ram Mahajan

map + index-many-to-many + collection

this is a ternary association

you can also use composite element

I have exactly the same problem over here. If anyone knows how to solve this it would greatly be appreciated ;-) .
One of the problems is the HashMap as it cannot contain equal keys. Therefore it is impossible to map this many-to-many.
Greetings and thanks in advance,
Jolliver