Posted by gouessej on Dec 22, 2018; 4:57pm
URL: https://forum.jogamp.org/GLCanvas-wit-overlay-tp4039329p4039341.html

I don't know what is wrong but this is what we do and it works:
https://github.com/gouessej/Ardor3D/blob/master/ardor3d-jogl-swt/src/main/java/com/ardor3d/framework/jogl/swt/JoglSwtCanvas.java#L87

redraw() will trigger the paint listener.