@Override
            public ApiFuture<ListReservationsPagedResponse> getFuturePagedResponse(
                UnaryCallable<ListReservationsRequest, ListReservationsResponse> callable,
                ListReservationsRequest request,
                ApiCallContext context,
                ApiFuture<ListReservationsResponse> futureResponse) {
              PageContext<ListReservationsRequest, ListReservationsResponse, Reservation>
                  pageContext =
                      PageContext.create(
                          callable, LIST_RESERVATIONS_PAGE_STR_DESC, request, context);
              return ListReservationsPagedResponse.createAsync(pageContext, futureResponse);
            }
The default scopes of the service.
java-tpu/google-cloud-tpu/src/main/java/com/google/cloud/tpu/v2alpha1/stub/TpuStubSettings.java