JOGL is a low-level API, a wrapper for OpenGL. It contains a lot of functionality to do low-level 3D graphics stuff, for example draw triangles, set up lighting etc.
It has no support for higher-level abstractions such as models of objects etc. For this you'll need a higher-level library such as Java 3D, which can manage a
scene graph for you in which you can load models.
I you just want to use JOGL and not a higher-level API such as Java 3D, then you'll have to write a lot of code to load and manage all the triangles in the model yourself - not a small task.