Hello
You can use GLContext.getCurrentGL().glGetString(GL.GL_VERSION), GLContext.getCurrentGL().glGetString(GL.GL_VENDOR) and GLContext.getCurrentGL().glGetString(GL.GL_RENDERER) to get this information.
You get this with the first one on an Nvidia GeForce RTX 2080:
4.6.0 NVIDIA
440.97You can call these methods when the OpenGL context is current inside GLEventListener.display().
This is a rudimentary example I wrote:
https://jogamp.org/wiki/index.php/Rudimentary_standalone_example_using_the_fixed_pipeline_by_Julien_Gouesse