Overview

Monocle is an experimental implementation of the Glass windowing component of JavaFX. It's targeted at simple embedded systems that do not have an underlying window system. It is an ongoing effort that 

Description of Monocle components

This is hard to read in the web interface, so you'll want to download the PDF if you are interested in Monocle's inner workings.

How to build Monocle

If you build OpenJFX for embedded Linux/ARM platforms from the 8u-dev repository then you get a functioning Monocle as well. You can also build it for Linux/x86 using the x86egl compile target (build with -PCOMPILE_TARGETS=x86egl on a system with GLESv2 and EGL development libraries installed). This builds the embedded stack for the Linux desktop; it is not the same as the GTK implementation of Glass. You cannot currently build any of the graphical implementations of Monocle for desktop windowing systems.

How to run Monocle

Since Monocle is an experimental implementation of Glass, it is not the default on any platform. To select it you run Java with the system property -Djavafx.platform=monocle on embedded platforms. This selects the Monocle implementation of Glass and sets other JavaFX options to match the embedded stack.

You can also select one of the specific back-ends of Monocle with the system property monocle.platform. Not all Monocle back-ends work with all Prism back-ends, so you might need to set prism.order as well.

If you are running the desktop build of JavaFX then your only monocle options is Headless. Desktop JavaFX does not support the javafx.platform system property, but you can select Monocle with:
-Dglass.platform=Monocle -Dmonocle.platform=Headless -Dprism.order=sw