I do not know why Oracle has problems even thoough xvfb has been configured OK but it could be the same reason as why OV Clients have problems if it is the resolution may be found below :
The table below contains an rc startup/shutdown shell script, which is being provided as an example to automate the startup of the Motif Window Manager (/usr/bin/X11/mwm) on the Virtual Framebuffer X Server.
Save the following code in the /sbin/init.d/mwm_xvfb file with read and execute permissions for everyone (555):
chmod 555 /sbin/init.d/mwm_xvfb
#!/sbin/sh
#
# Start Motif Window Manager on XVfb X server
#
PATH=/sbin:/usr/sbin:/usr/bin:
export PATH
MWM_PIDFILE=/var/run/mwm_xvfb.pid
rval=0
set_return() {
x=$?
if [ $x -ne 0 ]; then
echo "ERROR CODE $x"
rval=1
fi
}
if [ -f /etc/rc.config.d/xvfb ] ; then
. /etc/rc.config.d/xvfb
else
echo "ERROR: /etc/rc.config.d/xvfb defaults file MISSING"
fi
export UNIX95=1
case $1 in
start_msg)
echo "Start Motif WM on XVfb X server"
;;
stop_msg)
echo "Stopping Motif WM on XVfb X server"
;;
start)
if [ "$START_XVFB" -eq 1 ]; then
touch $MWM_PIDFILE
pid="$(cat $MWM_PIDFILE)"
if [ "$pid" = "$(ps -C mwm -opid=)" ]; then
echo Motif WM already running on :${DNUM}
rval=2
else
sleep 5
/usr/bin/X11/xset -q -display :${DNUM} >/dev/null && (
/usr/bin/X11/mwm -display :${DNUM} &
echo $! > $MWM_PIDFILE )
set_return
echo Motif WM started on display :${DNUM}
fi
else
rval=2
fi
;;
stop)
if [ ! -f $MWM_PIDFILE ]; then
rval=2
echo "Unable to identify Motif WM on XVfb X server"
else
pid=$(cat $MWM_PIDFILE)
if [ "$pid" = "$(ps -C mwm -opid=)" ]; then
kill -9 $pid
set_return
echo "Motif WM on XVfb X server stopped"
else
rval=2
echo "Cannot verify Motif WM on XVfb X server"
fi
fi
rm -rf $MWM_PIDFILE
;;
*)
echo "usage: $0 {start|stop}"
;;
esac
unset UNIX95
exit $rval
To automate the startup/shutdown of the Motif Window Manager with the Virtual Framebuffer X Server, create the following symbolic links:
ln -s /sbin/init.d/mwm_xvfb /sbin/rc3.d/S810mwm_xvfb
ln -s /sbin/init.d/mwm_xvfb /sbin/rc3.d/K190mwm_xvfb
