I currently have an error when I was doing it, everything is fine except one line of code.
bulletAppState.getPhysicsSpace().addCollisionListener(this);
It gave me an when run saying: RuntimeException: Uncompilable source code - Erroneous sym type: com.jme3.bullet.PhysicsSpace.addCollisionListener
And when I went with it’s suggestion to be
bulletAppState.getPhysicsSpace().addCollisionListener((PhysicsCollisionListener) this);
This error occured: ClassCastException: mygame.Main cannot be cast to com.jme3.bullet.collision.PhysicsCollisionListener
Do you know how to solve this?