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我試圖實現谷歌App Engine的默認數據統計API例如:谷歌的App Engine(Java)的統計數據存儲API導致的錯誤
http://code.google.com/appengine/docs/java/datastore/stats.html
import com.google.appengine.api.datastore.DatastoreService;
import com.google.appengine.api.datastore.DatastoreServiceFactory;
import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.datastore.Query;
// ...
DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
Entity globalStat = datastore.prepare(new Query("__Stat_Total__")).asSingleEntity();
Long totalBytes = (Long) globalStat.getProperty("bytes"); // NullPointerException happens here...
Long totalEntities = (Long) globalStat.getProperty("count");
我得到一個顯示java.lang.NullPointerException時試圖訪問globalStat對象屬性。我在本地測試,這個API只在生產環境中工作,還是我錯過了一些東西?
感謝