Posted by Wade Walker on May 22, 2012; 12:35am
URL: https://forum.jogamp.org/I-can-t-set-Line-Width-to-1-pixel-tp4004559p4005782.html

You might try querying the supported widths as described at http://www.opengl.org/wiki/GLAPI/glLineWidth. Implementations aren't required to support non-antialiased line widths greater than 1.