Please help! - Constraints Exception

Hello all,

I am new to pgsql-JDBC and I apologize if this is a trivial question
but I can not hack it!

I have a table with UNIQUE constraint on the column. Inserting 2 of
same values on it fails (as it should)
and I can see DBLog Error message. Alas, there is no exception thrown
from JDBC so that I can properly
handle it.

Any hints are appreciated!

Config
--------
postgresql 8.3
JDBC3 (8.3-604)
database is accessed through the network