Encoding conversion problem

Hi,
I have a J2EE application which connects to a DB2 configured with code
set IBM-850. The application works with encoding ISO-8859-1.
If I save characters outside the range sup****ted by IBM-850 (i.e. the
euro currency character EURO) then I read garbage...

I tried encoding conversions with InputStreamReader and
OutputStreamWriter:
....
BufferedReader reader = new BufferedReader(new
InputStreamReader(source, "IBM850"));
BufferedWriter writer = new BufferedWriter(new
OutputStreamWriter(output, "ISO-8859-1"));
....

but that didn't work...
My JVM Charset.availableCharsets() includes IBM850.

What can I do?

Thanks, in advance,
Andrea