STAX-Adapter - Failed to verify certificate of SSL-Connection to RQM

I tried to get a completely local to test and work on the RQM-Stax-Adapter. Right now my system has a running installation of STAF/STAX and also houses a local jazz server. The server is running, judging by the web interface, but throws a ~[FATAL ERROR] :48:29: The entity name must immediately follow the '&' in the entity reference.~ I read that i could ignore this error but I didn't want to leave it out seeing that I don't know what influence that could hate on my problem.

Long story short, I followed the installation guide that came with the Adapter package I was handed and am now stuck at the last point where I actually start the stax-adapter.jar. No matter what I try it ends stating ~FATAL STAXAdapter - Failed to verify the certificate of the SSL Connection to RQM. Try option - testenv for local RQM installation.~

I did try to create my own certificate both import that into the windows certificate manager and set the tomcat to use the new certificate. Also calling the stax-adapter.jar with or without -testenv does not seem to affect this error at all.

I was wondering if anyone encountered the same problem and might know a way to work around it.

regards,
Sebastian