如何在GAE灵活环境中注册Datastore的API环境？ [英] How do I register API environment for Datastore in GAE Flexible Environment?

问题描述

当试图在Google App Engine灵活环境中的Servlet中运行Datastore时，我得到没有为此线程注册API环境。 （详情如下。）

When trying to run Datastore in a Servlet in Google App Engine Flexible Environment I get "No API environment is registered for this thread." (Details below.)

我在StackOverflow上看到关于在本地机器或单元测试中发生的问题，但是这在正常的Servlet中发生在GAE中。

I see questions on StackOverflow about this happening in local machines or unit tests, but this is happening in GAE in a regular Servlet.

以下是我的Datastore代码的全部内容，这是一个简单的查询。我需要注册一个API环境吗？如果是这样，怎么样？

Here is the entirety of my Datastore code, a simple query. Do I need to register an API environment? If so, how?

List<String> kinds = new ArrayList<String>();
DatastoreService datastore = DatastoreServiceFactory.getDatastoreService(DatastoreServiceConfig.Builder                         .withImplicitTransactionManagementPolicy(ImplicitTransactionManagementPolicy.NONE));

PreparedQuery global = datastore.prepare(new Query("__kind__"));
for (Entity globalStat : global.asIterable()) {
   String kindName = globalStat.getKey().getName();
   kinds.add(kindName);
}

Stacktrace

Stacktrace

java.lang.NullPointerException: No API environment is registered for this thread.
    at com.google.appengine.api.datastore.DatastoreApiHelper.getCurrentAppId(DatastoreApiHelper.java:180)
    at com.google.appengine.api.datastore.DatastoreApiHelper.getCurrentAppIdNamespace(DatastoreApiHelper.java:196)
    at com.google.appengine.api.datastore.Query.<init>(Query.java:208)
    at com.google.appengine.api.datastore.Query.<init>(Query.java:139)
    at ...

推荐答案

为了在灵活环境下使用数据存储，您需要使用云数据存储

您可以使用 Compat Enviroment 如果您想使用旧API的数据存储

In order to use the datastore under Flexible environment you need to use the Cloud Datastore
You can use the Compat enviroment if you want to use the datastore using "old" APIs

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