I have this JSON response that returns from my API:

{
    "success": true,
    "message": "User list retreived",
    "data": [
        {
            "id": "1",
            "username": "admin",
            "password": "$2y$10$1h8jP8./G2bvlai3Prgwuu9fHHFsunerV0/aFo.JKKcWPh1MelyHy",
            "created": "2018-04-15 11:53:28",
            "modified": "2018-04-15 11:53:28",
            "grade": "4",
            "gradename": "Administrator",
            "department": "5",
            "departmentname": "Operations"
        },
        {
            "id": "2",
            "username": "julie",
            "password": "testing",
            "created": "0000-00-00 00:00:00",
            "modified": "0000-00-00 00:00:00",
            "grade": "1",
            "gradename": "User",
            "department": "1",
            "departmentname": "Front Desk"
        }
    ]
}

I am using retrofit to load the JSON response. I am using this function to read the JSON into my app:

    private void readUsers() {
        userList.clear();
        managerAdminApi.user(new Callback<ObjectUserResponse>() {
            @Override
            public void onResponse(@NonNull Call<ObjectUserResponse> call, @NonNull Response<ObjectUserResponse> response) {
                ObjectUserResponse JsonList = response.body();
                assert JsonList != null;
                ObjectUser[] data = JsonList.getData();
                for (int i = 0, dataLength = data.length; i < dataLength; i++) {
                    ObjectUser datum = data[i];
                    userList.add(new ObjectUser(
                        datum.getId(),
                        datum.getUsername(),
                        datum.getPassword(),
                        datum.getCreated(),
                        datum.getModified(),
                        datum.getGrade(),
                        datum.getGradeName(),
                        datum.getDepartment(),
                        datum.getDepartmentname()
                    ));
                }
                uAdapter.notifyDataSetChanged();
            }

            @Override
            public void onFailure(@NonNull Call<ObjectUserResponse> call, @NonNull Throwable t) {
            }
        });
    }

Everything works, except I can not read the array in the response named data. All I can read is the first element, but I need to read the entire array. I thought the code I had would do what I needed, but it only displays  the first element.