public void fireJoystickDisconnectedEvent(Joystick joystick) {
        for (JoystickConnectionListener listener : joystickConnectionListeners) {
            listener.onDisconnected(joystick);
        }
    }
Called when a joystick has been disconnected.
This should only be called internally.
@param joystick the joystick that has been disconnected.
jme3-core/src/main/java/com/jme3/input/InputManager.java