[SOLVED] Gtk-WARNING **: cannot open display

Hi,
I have centos 6 minimal (headless) as a Host and installed ubuntu 14.04 Desktop as a guest and using KVM.
There is a web application deployed inside Guest, and it opens and closes one GTK application (javafx) in background.
I am invoking this web app from my host thru ssh as "curl http://guest/myapp/start"
I observed the logs in Guest OS and see the error message "Gtk-WARNING **: cannot open display"

I didn't understand the reason for this error.
1) This GTK app is not opening any window physically in ssh console on host and moreover it's background.
2) Guest is desktop version.

Can any one help me how to resolve this. I can't enable XWindows due to security requirements by the client.

Thanks,
Sridhar


update 14-Apr-2015
==================
This is solved using xvfb and the following url helped me a lot
http://www.installationpage.com/sele...fox-in-ubuntu/

All gtk apps have to call gtk_init() before using any gtk functions, gtk_init checks for a sane environmemt and some other stuff, if it can't find a valid display it will error out even before trying to open a window, if you inable x forwading in the ssh config file and use the '-X' option to ssh you should be good to go.

Thanks Keith, that's the solution.
You're welcome, any time.
Sheesh! What happened to common courtesy!