Rendering without showing a window and viewport

I'm wanting to use jMonkey to generate rendered images from a linux side java daemon.  I'm expecting I can use render to texture etc but I don't want to be creating the usual game window and so on.  It needs to be able to run within a non-graphical environment.  Of course the machine will be fully loaded with the necessary graphics car hardware.

The aim is to produce a server side utility that dynamically produces avatar sprite sheets from 3d models upon request.

Is it possible to config jMonkey to run like this?