@Override
            public ApiFuture<ListSourcesPagedResponse> getFuturePagedResponse(
                UnaryCallable<ListSourcesRequest, ListSourcesResponse> callable,
                ListSourcesRequest request,
                ApiCallContext context,
                ApiFuture<ListSourcesResponse> futureResponse) {
              PageContext<ListSourcesRequest, ListSourcesResponse, Source> pageContext =
                  PageContext.create(callable, LIST_SOURCES_PAGE_STR_DESC, request, context);
              return ListSourcesPagedResponse.createAsync(pageContext, futureResponse);
            }
The default scopes of the service.
java-vmmigration/google-cloud-vmmigration/src/main/java/com/google/cloud/vmmigration/v1/stub/VmMigrationStubSettings.java