Hi
ted_gress wrote
Does anyone know if JOGL supports Retained Mode
JOGL is mostly a Java binding for the OpenGL / OpenGL ES API. Therefore, as OpenGL and OpenGL ES have supported the retained mode for years, JOGL has supported it too since its birth. The retained mode was already in OpenGL in 1995, years before the creation of JOGL. Your question is very strange.
The examples of the OpenGL Red Book have been ported to JOGL, you can find them on Github in the project "jogl-demos". Using OpenGL tutorials whose code is written in C isn't a big deal once you understand how to port them to JOGL.