我可以通过使用以下方法使其工作:
DatastoreFactory datastoreFactory = new DefaultDatastoreFactory();
Supplier<Datastore> datastore = () -> datastoreFactory.create(DatastoreOptions.getDefaultInstance());
//Register Datastore Entity classes
DatastoreMappingContext datastoreMappingContext = new DatastoreMappingContext();
datastoreMappingContext.setInitialEntitySet(new HashSet<>(Arrays.asList(Employee.class)));
ObjectToKeyFactory objectToKeyFactory = new DatastoreServiceObjectToKeyFactory(datastore);
DatastoreEntityConverter datastoreEntityConverter = new DefaultDatastoreEntityConverter(datastoreMappingContext, objectToKeyFactory);
DatastoreOperations datastoreOperations = new DatastoreTemplate(datastore,datastoreEntityConverter, datastoreMappingContext, objectToKeyFactory);
EmployeeRepository employeeRepository = new SimpleDatastoreRepository<>(datastoreOperations, Employee.class);
employeeRepository.count(); // findAll() etc