@POST
    @Consumes(MediaType.APPLICATION_JSON)
    public Response createUser(final UserRepresentation rep) {
        // first check if user has manage rights
        try {

// skipped some lines as are not relevant to this the question

        UserProfileProvider profileProvider = session.getProvider(UserProfileProvider.class);

        UserProfile profile = profileProvider.create(USER_API, rep.toAttributes());

        try {
            Response response = UserResource.validateUserProfile(profile, null, session);
            if (response != null) {
                return response;
            }

            UserModel user = profile.create();

            UserResource.updateUserFromRep(profile, user, rep, session, false);
            RepresentationToModel.createFederatedIdentities(rep, session, realm, user);
            RepresentationToModel.createGroups(rep, realm, user);