class“class”com.google.appengine.api.datastore.Key”不可持久

Question

我正在嘗試刪除給定鍵列表的多個實體，即：

List keys = obj.getKeys(); pm.deletePersistentAll(keys);

但是，當我嘗試刪除實體時，出現以下異常：

javax.jdo.JDOUserException: One or more instances could not be deleted
at org.datanucleus.jdo.JDOPersistenceManager.deletePersistentAll(JDOPersistenceManager.java:809)
at org.datanucleus.store.appengine.jdo.DatastoreJDOPersistenceManager.access$301(DatastoreJDOPersistenceManager.java:39)
at org.datanucleus.store.appengine.jdo.DatastoreJDOPersistenceManager$2.call(DatastoreJDOPersistenceManager.java:112)
at org.datanucleus.store.appengine.jdo.DatastoreJDOPersistenceManager$2.call(DatastoreJDOPersistenceManager.java:110)
at org.datanucleus.store.appengine.jdo.DatastoreJDOPersistenceManager$BatchManagerWrapper.call(DatastoreJDOPersistenceManager.java:125)
at org.datanucleus.store.appengine.jdo.DatastoreJDOPersistenceManager$BatchManagerWrapper.access$200(DatastoreJDOPersistenceManager.java:121)
at org.datanucleus.store.appengine.jdo.DatastoreJDOPersistenceManager.deletePersistentAll(DatastoreJDOPersistenceManager.java:110)

   NestedThrowablesStackTrace: org.datanucleus.jdo.exceptions.ClassNotPersistenceCapableException: The class "The class "com.google.appengine.api.datastore.Key" is not persistable. This means that it either hasnt been enhanced, or that the enhanced version of the file is not in the CLASSPATH (or is hidden by an unenhanced version), or the Meta-Data/annotations for the class are not found." is not persistable. This means that it either hasnt been enhanced, or that the enhanced version of the file is not in the CLASSPATH (or is hidden by an unenhanced version), or the Meta-Data for the class is not found.
at org.datanucleus.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:241)

有誰之前經歷過這個嗎？ 我確保我的課程得到了增強，並且所有課程都被標記為 PersistenceCapable。

謝謝

Answer 1

您只能刪除持久性 object（您傳遞給 pm.deletePersistentAll 的內容）。 “密鑰”不是持久的 object

Answer 2

要按鍵刪除實體，請嘗試

DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
ds.delete(key)