Posted by gouessej on Aug 10, 2022; 8:55pm
URL: https://forum.jogamp.org/Runtime-switch-bewteen-orthographic-and-perspective-projections-tp4041812p4041813.html

Please call this.drawable.invoke​(true, new GLRunnable(){
    public boolean run​(GLAutoDrawable drawable) {
        updateProjections();
        return false;
   }
});

You need a current OpenGL context to make your change work.

Rather call GLU.createGLU(GL).

Please don't use an obsolete version of JOGL, we don't use the javax namespace anymore.