[ojb-users] ODMG Cascading Updates : possible/probable bug.

[Charles A. <cha...@hp...>]

Hello All,

In OJB-0.8.375, cascading updates appears to be broken when using ODMG.

A colleague and I have managed to abstract the problem into a simple test
case.
test.ClassA has a collection of test.ClassB
test.ClassB has a reference back to test.ClassA
i.e. a simple bi-directional 0..n relationship between ClassA and ClassB.

We create an instance of ClassA, and add an instance of ClassB to the
classBs Collection; we then lock the instance of ClassA for write, and
commit the transaction.

Extract :
ClassA a1 = new ClassA("A 1");
ClassB b1 = new ClassB("B 1");
a1.getClassBs().add(b1);

Transaction tx = null;
tx = odmg.newTransaction();
tx.begin();
tx.lock(a1, tx.WRITE);
tx.commit();

When the transaction is committed, the ClassA row is correctly inserted into
the database, and ClassB row is also inserted into the database.
Unfortunately, it is inserted twice, resulting in a Primary key violation
(I've remove the primary key constraint in the attatched SQL).

It is some time since I've been able to spend anytime on OJB, and so my
knowledge of its internals has faded somewhat. However, by stepping through
in debug, it seems that the the ClassB instance is committed twice, once in
the collection and once on it's own.

I attach the test case, the repository_user.xml and the SQL to create the
tables. We're using SQL Server, but I'm fairly sure this is a platform
independent problem.

Are we doing something wrong, or is this a bug ?

Thanks,

Charles.



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