Posted by Wade Walker on Oct 28, 2010; 2:28am
URL: https://forum.jogamp.org/Odd-behaviour-from-GLEventListener-with-JOGL-2-tp1782146p1784054.html

This code also works instead of an animator:

try {
    Thread.sleep(1000);
}
catch (InterruptedException e1) {
}
canvas.display();

It seems like if you call canvas.display() too soon, it doesn't have any effect for some reason.