Posted by gouessej on Apr 03, 2021; 10:34pm
URL: https://forum.jogamp.org/Exporting-java-GLOOP-jogl-gluegen-project-in-eclipse-tp4041085p4041088.html

You have to modify GLOOP to drive it compatible with the latest version of JOGL which uses another namespace:
https://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/opengl/GL.html

We only maintain the latest version of JOGL. If you keep using an obsolete version of JOGL, you'll be left alone with the bugs we fixed.

Seriously, dropping GLOOP isn't a big deal, have a look at our examples and learn how to deal with an animator, it does most of the job.

Your screen capture doesn't show us all resources you included. If you include only your own classes, it won't work, it's not enough, you have to include the content of jogamp-fat.jar. Rather use Ant to do that:
https://jogamp.org/wiki/index.php?title=JogAmp_JAR_File_Handling#Fat-Jar