@Override
    public void execute(Setup setup, ConnectionSet connectionSet)
            throws Exception {
        ServerContext context = ServerContext.get();
        UserService userService = context.getService(UserService.class, 0);
        print("userGroup1: " + userService.getUser(13).getUserGroups());
        for (User user : userService.listUsers()) {
            if (user.getId() == 13) {
                print("userGroup2: " + user.getUserGroups());
            }
        }
    }

userGroup1: [32, 5]
userGroup2: []