Posted by gouessej on Jun 03, 2013; 5:40pm
URL: https://forum.jogamp.org/TextRenderer-my-text-won-t-show-tp4029291p4029307.html

Please rather use the official updated source code:
https://github.com/sgothel/jogl/blob/master/src/test/com/jogamp/opengl/test/junit/graph/demos/GPUTextNewtDemo01.java

The repository you quoted is just an obsolete copy of the RC3 whereas we're at the RC11.