Posted by gouessej on Nov 09, 2022; 7:22pm
URL: https://forum.jogamp.org/null-window-handle-GDISurface-tp4041905p4041921.html

Maybe it can help you to know how to use NewtCanvasJFX:
https://gouessej.wordpress.com/2020/04/05/javafx-et-jogl-fonctionnent-ensemble-javafx-and-jogl-work-together/