Found and fixed the issue:
http://code.google.com/p/datanucleus-appengine/issues/detail?id=171
On Wed, Dec 9, 2009 at 11:48 AM, Max Ross (Google) <
maxr+appeng...@google.com <maxr%2bappeng...@google.com>> wrote:
> Could you please post all the model objects that are involved in the
> example? Looks like SpeciesStats is missing. Also, it would be great if
> you could post the code that shows how you populate the Community object
> before persisting.
>
> Thanks,
> Max
>
>
> On Wed, Dec 9, 2009 at 11:40 AM, Max Ross (Google) <
> maxr+appeng...@google.com <maxr%2bappeng...@google.com>> wrote:
>
>> Thanks for the report, investigating now....
>>
>>
>> On Tue, Dec 8, 2009 at 2:33 PM, Pierre Lavignotte <
>> pierre.lavigno...@gmail.com> wrote:
>>
>>> Hi,
>>>
>>> I have a problem when I try to inherit a one-to-many relation ship
>>> from a base entity class.
>>>
>>> The following model works fine :
>>>
>>> @PersistenceCapable(identityType = IdentityType.APPLICATION)
>>> @Inheritance(strategy = InheritanceStrategy.SUBCLASS_TABLE)
>>> public abstract class BaseEntity {
>>>
>>> @PrimaryKey
>>> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
>>> private Key key;
>>>
>>> public Key getKey() {
>>> return key;
>>> }
>>> }
>>>
>>> @PersistenceCapable(identityType = IdentityType.APPLICATION)
>>> public class Community extends BaseEntity {
>>>
>>> @Persistent
>>> @Element(dependent = "true")
>>> private List<SpeciesStats> stats = new ArrayList<SpeciesStats>();
>>>
>>> public List<SpeciesStats> getStats() {
>>> return stats;
>>> }
>>>
>>> @Persistent(dependent = "true")
>>> TackleBox tackleBox;
>>>
>>> public TackleBox getTackleBox() {
>>> return tackleBox;
>>> }
>>>
>>> public void setTackleBox(TackleBox tackleBox) {
>>> this.tackleBox = tackleBox;
>>> }
>>> }
>>>
>>> @PersistenceCapable(identityType = IdentityType.APPLICATION)
>>> public class TackleBox extends BaseEntity {
>>> /* some other properties that eventually extend BaseEntity and so on
>>> */
>>> }
>>>
>>> But if I move "private List<SpeciesStats> stats" from Community to
>>> BaseEntity, I get a runtime exception when trying to read a Community
>>> entity :
>>> Caused by: java.lang.NullPointerException
>>> at org.datanucleus.store.appengine.DatastoreTable.runCallBacks
>>> (DatastoreTable.java:1025)
>>> at org.datanucleus.store.appengine.DatastoreTable.initializeNonPK
>>> (DatastoreTable.java:391)
>>> at org.datanucleus.store.appengine.DatastoreTable.buildMapping
>>> (DatastoreTable.java:285)
>>> at org.datanucleus.store.appengine.DatastoreManager.buildStoreData
>>> (DatastoreManager.java:405)
>>> at org.datanucleus.store.appengine.DatastoreManager.newStoreData
>>> (DatastoreManager.java:363)
>>> at org.datanucleus.store.AbstractStoreManager.addClasses
>>> (AbstractStoreManager.java:788)
>>> at org.datanucleus.store.AbstractStoreManager.addClass
>>> (AbstractStoreManager.java:759)
>>> at
>>> org.datanucleus.store.mapped.MappedStoreManager.getDatastoreClass
>>> (MappedStoreManager.java:358)
>>> at
>>> org.datanucleus.store.appengine.DatastoreManager.getDatastoreClass
>>> (DatastoreManager.java:631)
>>> at
>>> org.datanucleus.store.appengine.query.DatastoreQuery.performExecute
>>> (DatastoreQuery.java:212)
>>> at org.datanucleus.store.appengine.query.JDOQLQuery.performExecute
>>> (JDOQLQuery.java:85)
>>> 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)
>>>
>>> Or trying to persist one :
>>>
>>> java.lang.NullPointerException
>>> at org.datanucleus.store.appengine.DatastoreTable.runCallBacks
>>> (DatastoreTable.java:1025)
>>> at org.datanucleus.store.appengine.DatastoreTable.initializeNonPK
>>> (DatastoreTable.java:391)
>>> at org.datanucleus.store.appengine.DatastoreTable.buildMapping
>>> (DatastoreTable.java:285)
>>> at org.datanucleus.store.appengine.DatastoreManager.buildStoreData
>>> (DatastoreManager.java:405)
>>> at org.datanucleus.store.appengine.DatastoreManager.newStoreData
>>> (DatastoreManager.java:363)
>>> at org.datanucleus.store.AbstractStoreManager.addClasses
>>> (AbstractStoreManager.java:788)
>>> at org.datanucleus.store.AbstractStoreManager.addClass
>>> (AbstractStoreManager.java:759)
>>> at
>>> org.datanucleus.store.mapped.MappedStoreManager.getDatastoreClass
>>> (MappedStoreManager.java:358)
>>> at
>>> org.datanucleus.store.appengine.DatastoreManager.getDatastoreClass
>>> (DatastoreManager.java:631)
>>> at
>>>
>>> org.datanucleus.store.appengine.DatastoreFieldManager.buildMappingConsumer
>>> (DatastoreFieldManager.java:1008)
>>> at
>>>
>>> org.datanucleus.store.appengine.DatastoreFieldManager.buildMappingConsumer
>>> (DatastoreFieldManager.java:998)
>>> at org.datanucleus.store.appengine.DatastoreFieldManager.<init>
>>> (DatastoreFieldManager.java:133)
>>> at org.datanucleus.store.appengine.DatastoreFieldManager.<init>
>>> (DatastoreFieldManager.java:167)
>>> at
>>>
>>> org.datanucleus.store.appengine.DatastorePersistenceHandler.insertPreProcess
>>> (DatastorePersistenceHandler.java:316)
>>> at
>>> org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObjects
>>> (DatastorePersistenceHandler.java:236)
>>> at
>>> org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObject
>>> (DatastorePersistenceHandler.java:225)
>>> 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)
>>>
>>> Same thing if Community inherits from another class that have a
>>> List<SpeciesStats> properties, so Community is the only class that
>>> have this property.
>>>
>>> What's wrong ? Did I miss something with the anotations ?
>>>
>>> Thanks,
>>> Pierre
>>>
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>>>
>>>
>>
>
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