We have released a MicroEJ Mono-Sandbox Firmware  on developer.microej.com.
This demo firmware showcases a thermostat UI on FDRM-K28F evaluation board  in addition to the screen TFT PROTO 5" Capacitive . this firmware can be flashed by following the getting started at microej.nxp.com .
The MicroEJ Team
 TFT PROTO 5" Capacitive Board - MikroElektronika