Problem

After having called a deployed BIRT report, a messagebox appears (it will appear just once in total, so if another user has had this box before, you will not see it) and informs about problems with the X11 Windowing System, Device 0,0 or something similar.

Solution

Find JBsss's run.sh and add the last (-Djava.awt.headless=true) of the two following parameters:

JAVA_OPTS="$JAVA_OPTS -Dprogram.name=$PROGNAME -Djava.awt.headless=true"