JBAS can't start if there are some diacritical marks in its path. For example: /home/martin/Nástroje/JBAS/... It generates some exceptions, but they don't describe the problem so much. But I will paste them if you are interested in. It exits with "failed to start" message.

It's interesting that JBAS 4.0.5 doesn't have this problem but 4.2.* (I tried 4.2.0.GA and 4.2.2.GA) does.