Problem with Servererror when connecting to jUDDI

[bEn Fries <De...@gmx.de>]

Hi,

I installed jUDDI - seems to be working as it's happyness page is .. 
well... happy.
So I tried to run an example from UDDI4J. Now this example throws an 
exeption and reports an:

(500) Internal Server Error

I thought this might be a user/passwort issue but the passwords seem to 
be OK:

In UDDI4J I used

userid = sviens
password = password

(as this is the "included" user of jUDDI)
 
and in juddi-user.xml I have a user as follows:
<user userid="sviens" password="password" />

and there is a publisher in the juddi/publisher database
with ID "sviens"

So I'm pretty sure this should be OK - is there sth else that might 
cause this error?

Any idea where I might start debugging?

Thanx in Advance

Ben