There is also an example of how to create a JOGL RCP plugin the new way (with the .dll/.dylib/.so left inside JAR files) in my GitHub at https://github.com/WadeWalker/com.jogamp.jogl. If you check out that repo, it'll give you a complete JOGL RCP plugin, though you'll probably want to upgrade the JOGL JARs to the latest version after you make sure it works.