Posted by Pixelapp on Aug 11, 2012; 2:29pm
URL: https://forum.jogamp.org/Setting-proper-window-size-with-NEWT-tp4025780p4025782.html

I think this is what you need:

.setUndecorated(false);
.setFullscreen(true);

This maxes out the window without hiding the task bar. In Microsoft Windows at least.