Hi Fixou,
Try replacing this line:
Query query = Device.getPersistenceManager().newQuery(sqlFetchAll);
with this:
Query query = Device.getPersistenceManager().newQuery(Device.class);
eliminating the "String sqlFetchAll" line. I use this approach and it
works for me.
On Jul 25, 3:23 pm, Fixou <fixx...@gmail.com> wrote:
> Here is the code i am trying to run, where "Device" is a
> persistententity stored in the datastore.
>
> @SuppressWarnings("unchecked")
> public static List<Device> findAll() {
> String sqlFetchAll = "select from " + Device.class.getName();
> Query query = Device.getPersistenceManager().newQuery(sqlFetchAll);
> List<Device> Devices = (List<Device>) query.execute();
> return Devices;
>
> }
>
> here is what i am getting:
> SEVERE: [Ljava.lang.StackTraceElement;@35389244
> java.lang.NullPointerException
> at
> org.datanucleus.store.mapped.mapping.PersistenceCapableMapping.prepareDatas
> toreMapping(PersistenceCapableMapping.java:
> 173)
> at
> org.datanucleus.store.mapped.mapping.PersistenceCapableMapping.initialize(P
> ersistenceCapableMapping.java:
> 117)
> at
> org.datanucleus.store.mapped.mapping.MappingFactory.createMapping(MappingFa
> ctory.java:
> 97)
> at
> org.datanucleus.store.mapped.mapping.AbstractMappingManager.getMapping(Abst
> ractMappingManager.java:
> 248)
> at
> org.datanucleus.store.appengine.DatastoreTable.initializeNonPK(DatastoreTab
> le.java:
> 322)
> at
> org.datanucleus.store.appengine.DatastoreTable.buildMapping(DatastoreTable.
> java:
> 288)
> at
> org.datanucleus.store.appengine.DatastoreManager.buildStoreData(DatastoreMa
> nager.java:
> 479)
> at
> org.datanucleus.store.appengine.DatastoreManager.newStoreData(DatastoreMana
> ger.java:
> 437)
> at
> org.datanucleus.store.AbstractStoreManager.addClasses(AbstractStoreManager.
> java:
> 788)
> at
> org.datanucleus.store.AbstractStoreManager.addClass(AbstractStoreManager.ja
> va:
> 759)
> at
> org.datanucleus.store.mapped.MappedStoreManager.getDatastoreClass(MappedSto
> reManager.java:
> 358)
> at
> org.datanucleus.store.appengine.DatastoreManager.getDatastoreClass(Datastor
> eManager.java:
> 709)
> at
> org.datanucleus.store.appengine.query.DatastoreQuery.performExecute(Datasto
> reQuery.java:
> 214)
> at
> org.datanucleus.store.appengine.query.JDOQLQuery.performExecute(JDOQLQuery.
> java:
> 89)
> at org.datanucleus.store.query.Query.executeQuery(Query.java:1489)
> at org.datanucleus.store.query.Query.executeWithArray(Query.java:
> 1371)
> at org.datanucleus.store.query.Query.execute(Query.java:1344)
> at org.datanucleus.jdo.JDOQuery.execute(JDOQuery.java:221)
> at com.fxbeckers.test.Device.findAll(Device.java:233)
> at com.fxbeckers.test.DevicesManager.findWinners(DevicesManager:112)
>
> Does anybody have a clue? i've been stuck on this for 3 days!
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