> Um... This is strange.
> Because I've been using the previous jaybird version (JayBird-
> 2.0.0RC2JDK_1.4) with the same Firebird version to create a
> connection in the same way and is in use for a certain period of
> time. So I suppose there is no configuration changes except changes
> in the Jaybird library.

The previous version did not understand the UTF8 encoding for Firebird
2.0, so if you used the charSet=UTF-8 it meant encoding=UNICODE_FSS.
Jaybird 2.1 now for charSet=UTF-8 specifies the encoding=UTF8.

So, if you specify encoding=UNICODE_FSS instead of charSet, it should work.

> The fbintl.conf is placed in the same folder as fbintl.dll.
> I've then tried to move these files under the same folder as
> fbembed.dll, but seems no difference. Is there any other
> configurations required?

Did you specify the FIREBIRD environment variable?

set FIREBIRD=.\bin

Roman