For anyone interested:

j-Interop(http://j-interop.sourceforge.net) implements DCOM wire
protocol (MSRPC) to enable development of Pure Bi-Directional,
Non-Native Java applications which can interoperate with any COM
component.The implementation itself is purely in Java and does not use
JNI to provide native access,thus being truly platform independent. It
has full support for COM automation and supports callback from COM
Servers (event handling).

1.04(a) has been tested on Windows XP/2K/2K3 and Fedora 5. Beta is
expected out by second week of september.

This release can be downloaded from
http://sourceforge.net/project/showfiles.php?group_id=174727