Lost in unicode?

Hello to all,

I compiled postgresql with unicode support:
./configure --enable-multibyte=UNICODE
later I create the DB: createDB JMdict -R UNICODE
\encoding shows UNICODE

so far, so good...

As java natively speaks unicode(UTF-8), just naively wrote strings of Japanese
into the DB.
But actually they reside as "?" in the Database.
this doesn't seem to be UNICODE support, i.e. I am probably missing something,
as of how I can enter data as unicode.

Hopefully you might help me out there, as I'm probably not the only one with
the ned of UNICODE and Java.

best greets & cheers,
chris