#fixed code
                                @Override
    public Response get(String guid) {
        logger.debug("Device get requested. Guid {}", guid);

        HivePrincipal principal = (HivePrincipal) SecurityContextHolder.getContext().getAuthentication().getPrincipal();

        Device device = deviceService.getDeviceWithNetworkAndDeviceClass(guid, principal);

        logger.debug("Device get proceed successfully. Guid {}", guid);
        return ResponseFactory.response(Response.Status.OK, device, DEVICE_PUBLISHED);
    }
#vulnerable code 
                                @Override
    public Response get(String guid) {
        logger.debug("Device get requested. Guid {}", guid);

        HivePrincipal principal = (HivePrincipal) SecurityContextHolder.getContext().getAuthentication().getPrincipal();

        Device device = deviceService.getDeviceWithNetworkAndDeviceClass(guid, principal);

        if (principal.getRole().equals(HiveRoles.DEVICE)) {
            logger.debug("Device get proceed successfully. Guid {}", guid);
            return ResponseFactory.response(Response.Status.OK, device, DEVICE_PUBLISHED_DEVICE_AUTH);
        }
        logger.debug("Device get proceed successfully. Guid {}", guid);
        return ResponseFactory.response(Response.Status.OK, device, DEVICE_PUBLISHED);
    } 
                            #location 9 
                            #vulnerability type NULL_DEREFERENCE