@Override
            public ApiFuture<ListTracesPagedResponse> getFuturePagedResponse(
                UnaryCallable<ListTracesRequest, ListTracesResponse> callable,
                ListTracesRequest request,
                ApiCallContext context,
                ApiFuture<ListTracesResponse> futureResponse) {
              PageContext<ListTracesRequest, ListTracesResponse, Trace> pageContext =
                  PageContext.create(callable, LIST_TRACES_PAGE_STR_DESC, request, context);
              return ListTracesPagedResponse.createAsync(pageContext, futureResponse);
            }
The default scopes of the service.
java-trace/google-cloud-trace/src/main/java/com/google/cloud/trace/v1/stub/TraceServiceStubSettings.java