Posted by Rami Santina on Sep 27, 2011; 10:39am
URL: https://forum.jogamp.org/Antialiased-polygons-in-JOGL-2-0-rc3-tp3369689p3372215.html

As i remember the polygon smooth is of inconsistant behaviour dependent on the driver. So even with direct opengl u will get the same results.

IMHO u can try using msaa to smooth ur polygon edges. In the end the poly smooth will be doing the same thing but for one polygon...expensive.  and wont produce good results for neighboring polys.