I`m using app engine with java and getting this error when trying retrieve
a especific register from datastore.. The exception is
com.rga.google.creativesandbox.service.CampaignService getByUrlDescription:
Operation failed...
java.lang.NullPointerException
at
com.google.appengine.api.datastore.KeyTranslator.convertToPb(KeyTranslator.java:49)
at
com.google.appengine.api.datastore.AsyncDatastoreServiceImpl$V3KeyBatcher.toPb(AsyncDatastoreServiceImpl.java:111)
at
com.google.appengine.api.datastore.AsyncDatastoreServiceImpl$V3KeyBatcher.toPb(AsyncDatastoreServiceImpl.java:102)
at
com.google.appengine.api.datastore.Batcher$BatchIterator.next(Batcher.java:210)
at
com.google.appengine.api.datastore.Batcher$BatchIterator.next(Batcher.java:151)
at
com.google.appengine.api.datastore.AsyncDatastoreServiceImpl$V3Batcher.makeCalls(AsyncDatastoreServiceImpl.java:91)
at
com.google.appengine.api.datastore.AsyncDatastoreServiceImpl.doBatchGet(AsyncDatastoreServiceImpl.java:303)
at
com.google.appengine.api.datastore.AsyncDatastoreServiceImpl.get(AsyncDatastoreServiceImpl.java:280)
at
com.google.appengine.api.datastore.DatastoreServiceImpl$1.runInternal(DatastoreServiceImpl.java:69)
at
com.google.appengine.api.datastore.DatastoreServiceImpl$1.runInternal(DatastoreServiceImpl.java:66)
at
com.google.appengine.api.datastore.TransactionRunner.runInTransaction(TransactionRunner.java:29)
at
com.google.appengine.api.datastore.DatastoreServiceImpl.get(DatastoreServiceImpl.java:66)
at
com.google.appengine.datanucleus.WrappedDatastoreService.get(WrappedDatastoreService.java:80)
at
com.google.appengine.datanucleus.FetchFieldManager.getCollectionFromDatastoreObject(FetchFieldManager.java:666)
at
com.google.appengine.datanucleus.FetchFieldManager.fetchRelationField(FetchFieldManager.java:483)
at
com.google.appengine.datanucleus.FetchFieldManager.fetchObjectField(FetchFieldManager.java:405)
at
org.datanucleus.state.AbstractStateManager.replacingObjectField(AbstractStateManager.java:2353)
at
com.rga.google.creativesandbox.entity.Campaign.jdoReplaceField(Campaign.java)
at
com.rga.google.creativesandbox.entity.Campaign.jdoReplaceFields(Campaign.java)
at
org.datanucleus.state.JDOStateManager.replaceNonLoadedFields(JDOStateManager.java:1992)
at
com.google.appengine.datanucleus.EntityUtils$1.fetchNonLoadedFields(EntityUtils.java:977)
at
org.datanucleus.ObjectManagerImpl.findObject(ObjectManagerImpl.java:2899)
at
com.google.appengine.datanucleus.EntityUtils.entityToPojo(EntityUtils.java:1014)
at
com.google.appengine.datanucleus.query.DatastoreQuery$2.apply(DatastoreQuery.java:229)
at
com.google.appengine.datanucleus.query.DatastoreQuery$2.apply(DatastoreQuery.java:226)
at
com.google.appengine.datanucleus.query.LazyResult.resolveNext(LazyResult.java:96)
at
com.google.appengine.datanucleus.query.LazyResult.resolveAll(LazyResult.java:121)
at
com.google.appengine.datanucleus.query.LazyResult.size(LazyResult.java:115)
at
com.google.appengine.datanucleus.query.StreamingQueryResult.size(StreamingQueryResult.java:151)
at org.datanucleus.store.query.Query.executeQuery(Query.java:1808)
at org.datanucleus.store.query.Query.executeWithMap(Query.java:1693)
at org.datanucleus.api.jpa.JPAQuery.getSingleResult(JPAQuery.java:232)
at
com.rga.google.creativesandbox.dao.CampaignDao.getByUrlDescription(CampaignDao.java:127)
I believe that this error is related with a value None on datastore
campaignResourcesvalue:[datastore_types.Key.from_path(u'Campaign',
5398208297566208L, u'CampaignResource', 5629499534213120L,
_app=u's~creativesandbox-prod', namespace=u'google_creativesandbox_2013'),
*None*, datastore_types.Key.from_path(u'Campaign', 5398208297566208L,
u'CampaignResource', 5707702298738688L, _app=u's~creativesandbox-prod',
namespace=u'google_creativesandbox_2013'),
datastore_types.Key.from_path(u'Campaign', 5398208297566208L,
u'CampaignResource', 6270652252160000L, _app=u's~creativesandbox-prod',
namespace=u'google_creativesandbox_2013')]type:list
I don`t know why this value was placed in that way, In datastore viewer I
can`t change a property of list type and I can`t retrieve this document in
my application, what can I do?
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