I was this problem. The solution was to make a patch in the jdbc driver.
You can see it in
http://archives.postgresql.org/pgsql-jdbc/2005-03/msg00149.php
Gilbert, Antoine escribió:
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> Hi
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> I have a postgresql database, the encoding of the database is SQL_ASCII
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> When I use the postgresql driver, I have problem retrieving special
> characters that display correctly in the postgres admin.
