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java.lang.NullPointerException: No API environment is registered for this thread.	at com.google.appengine.api.datastore.DatastoreApiHelper.getCurrentAppId(DatastoreApiHelper.java:108)	at com.google.appengine.api.datastore.DatastoreApiHelper.getCurrentAppIdNamespace(DatastoreApiHelper.java:118)	at com.google.appengine.api.datastore.Key.(Key.java:104)	at com.google.appengine.api.datastore.Key.(Key.java:88)	at com.google.appengine.api.datastore.Key.(Key.java:84)	at com.google.appengine.api.datastore.Entity.(Entity.java:122)	at com.google.appengine.api.datastore.Entity.(Entity.java:103)	at org.datanucleus.store.appengine.DatastoreFieldManager.(DatastoreFieldManager.java:187)	at org.datanucleus.store.appengine.DatastorePersistenceHandler.insertPreProcess(DatastorePersistenceHandler.java:338)	at org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObjects(DatastorePersistenceHandler.java:251)	at org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObject(DatastorePersistenceHandler.java:240)	at org.datanucleus.state.JDOStateManagerImpl.internalMakePersistent(JDOStateManagerImpl.java:3185)	at org.datanucleus.state.JDOStateManagerImpl.makePersistent(JDOStateManagerImpl.java:3161)	at org.datanucleus.ObjectManagerImpl.persistObjectInternal(ObjectManagerImpl.java:1298)	at org.datanucleus.ObjectManagerImpl.persistObject(ObjectManagerImpl.java:1175)	at org.datanucleus.jdo.JDOPersistenceManager.jdoMakePersistent(JDOPersistenceManager.java:669)	at org.datanucleus.jdo.JDOPersistenceManager.makePersistent(JDOPersistenceManager.java:694)	at com.stuff.server.GreetingServiceImpl.saveContact(GreetingServiceImpl.java:25)	at com.stuff.server.TestCase.testServerCallBack(TestCase.java:18)	at com.stuff.server.TestCase.main(TestCase.java:13)