/**
     * Method to read the user list from the database
     */

    public void readUsers() {
        userList.clear();
        managerAdminApi.GetUsers(new Callback<ArrayList<ObjectUser>>() {
            @Override
            public void onResponse(@NonNull Call<ArrayList<ObjectUser>> call, Response<ArrayList<ObjectUser>> response) {
                ArrayList<ObjectUser> JsonList = response.body();
                for (int i = 0; i < requireNonNull(JsonList).size(); i++) {
                    userList.add(new ObjectUser(
                            JsonList.get(i).getId(),
                            JsonList.get(i).getUsername(),
                            JsonList.get(i).getPassword(),
                            JsonList.get(i).getCreated(),
                            JsonList.get(i).getModified(),
                            JsonList.get(i).getGrade(),
                            JsonList.get(i).getDepartment()
                    ));
                }
                uAdapter.notifyDataSetChanged();
            }

            @Override
            public void onFailure(Call<ArrayList<ObjectUser>> call, Throwable t) {

            }
        });
    }