TOPLINK-69 exception during commit.

Question

I am receiving the following exception during commit, idcprice.tenor happens to
be an aggregate object defined in extending class, this does not always happen,
can provide more info.
This is extremely urgent!!! thanks
Exception:
2008-04-03 17:05:05,390 ERROR http-0.0.0.0-8080-3 [[email protected]] FXTRADER_WORKFLOWHEL
PER_FACADE :: acceptRFPQuote() : Exception thrown Database exception: Exception [TOPLINK-69] (Oracle
TopLink - 10g Release 3 (10.1.3.3.0) (Build 070620)): oracle.toplink.exceptions.DescriptorException
Exception Description: A NullPointerException was thrown while extracting a value from the instance
variable [tenor] in the object [null].
Internal Exception: java.lang.NullPointerException
Mapping: oracle.toplink.mappings.DirectToFieldMapping[tenor-->IdcPrice.tenor]
Descriptor: Descriptor(com.integral.finance.trade.Tenor --> [DatabaseTable(IdcPrice)]).

Answer 1

The bug is that you're getting an NPE instead of a validation exception. When the bug is fixed you'll still get an exception--just one that communicates the problem in your code better.
It boils down to the fact that you can't share a single aggregate instance between two "owners". This has nothing to do with the aggregate being defined in the base class. The owner and aggregate form a composite--they have the same life cycle. For example if you delete the owner you delete the aggregate. I think you have a situation in which the same instance of an aggregate is being assigned to two owner objects and you're getting this exception.
In other words somewhere in your code you're either doing something like:
MyAggregate ag = new MyAggregate();
object1.setAggregate(ag);
object2.setAggregate(ag);or
object1.setAggregate(object2.getAggregate());You need to clone an aggregate if you want to duplicate it's value and assign it to a second owner. Something like:
MyAggregate ag = new MyAggregate();
object1.setAggregate(ag);
object2.setAggregate(ag.clone());or
object1.setAggregate(object2.getAggregate().clone());--Shaun