Incorrect query generation in AggregateCollectionMapping

Hello!
We have replaced some of OneToMany mappings with AggregateCollection. Despite of our expectations, some of these mappings are not working.
When inserting some objects using AggregateCollection mapping, we get the following exception:
INTERNAL EXCEPTION STACK:
java.lang.NullPointerException
at java.lang.reflect.Field.get(Native Method)
at oracle.toplink.internal.descriptors.InstanceVariableAttributeAccessor.getAttributeValueFromObject(Unknown Sou
rce)
at oracle.toplink.mappings.DatabaseMapping.getAttributeValueFromObject(Unknown Source)
at oracle.toplink.mappings.AggregateMapping.getAttributeValueFromBackupClone(Unknown Source)
at oracle.toplink.mappings.AggregateMapping.buildAggregateModifyQuery(Unknown Source)
at oracle.toplink.mappings.AggregateMapping.buildAggregateWriteQuery(Unknown Source)
at oracle.toplink.mappings.AggregateMapping.preInsertAttributeValue(Unknown Source)
at oracle.toplink.mappings.AggregateMapping.preInsert(Unknown Source)
at oracle.toplink.publicinterface.DescriptorQueryManager.preInsert(Unknown Source)
at oracle.toplink.mappings.AggregateCollectionMapping.preInsert(Unknown Source)
at oracle.toplink.publicinterface.DescriptorQueryManager.preInsert(Unknown Source)
at oracle.toplink.internal.queryframework.DatabaseQueryMechanism.insertObjectForWrite(Unknown Source)
at oracle.toplink.queryframework.InsertObjectQuery.executeCommit(Unknown Source)
at oracle.toplink.internal.queryframework.DatabaseQueryMechanism.performUserDefinedWrite(Unknown Source)
at oracle.toplink.internal.queryframework.DatabaseQueryMechanism.performUserDefinedInsert(Unknown Source)
at oracle.toplink.internal.queryframework.DatabaseQueryMechanism.insertObjectForWrite(Unknown Source)
at oracle.toplink.queryframework.WriteObjectQuery.executeCommit(Unknown Source)
at oracle.toplink.internal.queryframework.DatabaseQueryMechanism.executeWrite(Unknown Source)
at oracle.toplink.queryframework.WriteObjectQuery.execute(Unknown Source)
at oracle.toplink.queryframework.DatabaseQuery.execute(Unknown Source)
at oracle.toplink.publicinterface.Session.internalExecuteQuery(Unknown Source)
at oracle.toplink.publicinterface.UnitOfWork.internalExecuteQuery(Unknown Source)
at oracle.toplink.publicinterface.Session.executeQuery(Unknown Source)
at oracle.toplink.publicinterface.Session.executeQuery(Unknown Source)
at oracle.toplink.internal.sessions.CommitManager.commitAllObjects(Unknown Source)
at oracle.toplink.publicinterface.Session.writeAllObjects(Unknown Source)
at oracle.toplink.publicinterface.UnitOfWork.commitToDatabase(Unknown Source)
at oracle.toplink.publicinterface.UnitOfWork.commitRootUnitOfWork(Unknown Source)
at oracle.toplink.publicinterface.UnitOfWork.commit(Unknown Source)
From the stack trace we may assume that there are some problems created by AggregateCollection mapping for AggregateObject mapping, taking into account that under the same conditions OneToMany is working.
After some source code analysis, it was found that the problem is because there is no any backup clone instance specified within InsertObjectQuery which is passed by AggregateCollectionMapping then to AggregateObject mapping (this may be in AggregateCollectionMapping.prepareModifyQuery, for example). Then AggregateObject mapping fails, because of trying to extract aggregate field value from backup instance which is 'null' (AggregateMapping.buildAggregateModifyQuery, code 'getAttributeValueFromBackupClone(sourceQuery.getBackupClone())').
It looks like defect in AggregateCollectionMapping implementatation.
By the way, if we insert something like:
if (modifyQuery.getSession().isUnitOfWork()) {
Object backupClone = getReferenceDescriptor().getObjectBuilder().buildNewInstance();
modifyQuery.setBackupClone(backupClone);
at the end of AggregateCollectionMapping.prepareModifyQuery, everything works fine.
Could somebody from TopLink team comment this?
Thanks in advance,
Sergey

You are correct, the backupClone was incorrectly not being set in this case.
I have logged this issue internally, you may want to follow it up with technical support.
Thanks for reporting the problem and debugging the cause.

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