@Override
            public ApiFuture<ListCustomClassesPagedResponse> getFuturePagedResponse(
                UnaryCallable<ListCustomClassesRequest, ListCustomClassesResponse> callable,
                ListCustomClassesRequest request,
                ApiCallContext context,
                ApiFuture<ListCustomClassesResponse> futureResponse) {
              PageContext<ListCustomClassesRequest, ListCustomClassesResponse, CustomClass>
                  pageContext =
                      PageContext.create(
                          callable, LIST_CUSTOM_CLASSES_PAGE_STR_DESC, request, context);
              return ListCustomClassesPagedResponse.createAsync(pageContext, futureResponse);
            }
The default scopes of the service.
java-speech/google-cloud-speech/src/main/java/com/google/cloud/speech/v2/stub/SpeechStubSettings.java