GetTransaction().validate(); - what happens if the Insert fails?

Hi forum members,
I am rookie in terms of development with ADF/Jdeveloper and I've got an error which I've traced to the following piece of code
am.getTransaction().validate();
am.getTransaction().postChanges();
DBSequence newAdId = (DBSequence)newAssociatedDocument.getAttribute("AdId");
int adId = newAdId.getSequenceNumber().intValue();
return adId;
"am" as you'd guess is an ApplicationModule
The return value of "adId" is -1.
The "ADID" in the database is controlled by a Pre-Insert Database trigger which fills it with a Primary Key value.
Now, it sounds like the Insert of the Row fails somewhere and hence the "adID" is -1 as I've read that in Metalink. Like, DBSequence initially populates it with "-1" and then fills it (if the transaction is successful) with the actual ADID value that was inserted into the database (behind the scenes using the RETURNING INTO clause).
But my question is How to Trap the Oracle Database Error that happens behind the scenes? Like it looks like the postChanges() is actually successful (no Exception raised, else it would have been cascaded back) and we actually get a "-1" returned to the Caller.
Would I be able to do an Oracle Trace and detect the Oracle error?
Thanks
Ravi

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http://support.apple.com/kb/ht1766

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