Thanks Erel, I think it will work.
I had been tinkering w jar files, and realized they were not running in jdk 11.............. I spent more time in diagnostics, and realized it was something to do this for javafx. I struggled further, and it was frustrating as no solution was forthcoming. Than, I downloaded and installed this , bellsoft-jdk11.0.13+8-windows-amd64-full , and the problem was resolved. Link as below.
I am sharing this, as I feel that this may be valuable input for you.
https://bell-sw.com/pages/downloads/ is the link. the best part is that these guys r bundling fx with the application, which is not available from oracle. and the installation is also great. Request you to test and see if this is a useful input.
Regards