Hey,
I have 3 classes: Person, Car and Model.
Person has an ArrayList property defined:
List<Car> cars;
Car is an abstract class which class Model extends, I.e.
@PersistenceCapable
@Inheritance(strategy = InheritanceStrategy.SUBCLASS_TABLE)
public abstract class Car {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
protected Key key;
public Car() {
}
}
Model extends Car:
@PersistenceCapable
public class Model extends Car {
public Model() {
}
}
I load a Person object and create a new Car object, I.e.
Person personObj = pm.getObjectById(Person.class, key);
Car newCar = new Model();
I then try to persist the new Car by adding it to the "cars" property
in the Person Class, I.e.
personObj.getCars().add(newCar);
However, when I try this App Engine throws the following exception:
java.lang.ArrayIndexOutOfBoundsException: 0
at
org.datanucleus.store.mapped.scostore.FKListStore.<init>(FKListStore.java:
133)
at
org.datanucleus.store.appengine.DatastoreFKListStore.<init>(DatastoreFKListStore.java:
41)
at
org.datanucleus.store.appengine.DatastoreManager.newFKListStore(DatastoreManager.java:
528)
at
org.datanucleus.store.mapped.MappedStoreManager.getBackingStoreForCollection(MappedStoreManager.java:
729)
at
org.datanucleus.store.mapped.MappedStoreManager.getBackingStoreForField(MappedStoreManager.java:
646)
at org.datanucleus.sco.backed.List.<init>(List.java:104)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:
39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:
27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at
com.google.appengine.tools.development.agent.runtime.Runtime.newInstance_(Runtime.java:
112)
at
com.google.appengine.tools.development.agent.runtime.Runtime.newInstance(Runtime.java:
120)
at org.datanucleus.util.ClassUtils.newInstance(ClassUtils.java:94)
at org.datanucleus.sco.SCOUtils.newSCOInstance(SCOUtils.java:164)
at
org.datanucleus.store.mapped.mapping.AbstractContainerMapping.replaceFieldWithWrapper(AbstractContainerMapping.java:
426)
at
org.datanucleus.store.mapped.mapping.CollectionMapping.postInsert(CollectionMapping.java:
165)
at
org.datanucleus.store.appengine.DatastoreRelationFieldManager.runPostInsertMappingCallbacks(DatastoreRelationFieldManager.java:
217)
at
org.datanucleus.store.appengine.DatastoreRelationFieldManager.access
$200(DatastoreRelationFieldManager.java:48)
at org.datanucleus.store.appengine.DatastoreRelationFieldManager
$1.apply(DatastoreRelationFieldManager.java:116)
at
org.datanucleus.store.appengine.DatastoreRelationFieldManager.storeRelations(DatastoreRelationFieldManager.java:
81)
at
org.datanucleus.store.appengine.DatastoreFieldManager.storeRelations(DatastoreFieldManager.java:
955)
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.storeRelations(DatastorePersistenceHandler.java:
546)
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.insertPostProcess(DatastorePersistenceHandler.java:
304)
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObjects(DatastorePersistenceHandler.java:
256)
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:
1170)
at
org.datanucleus.jdo.JDOPersistenceManager.jdoMakePersistent(JDOPersistenceManager.java:
669)
at
org.datanucleus.jdo.JDOPersistenceManager.makePersistent(JDOPersistenceManager.java:
694)
This sounds much like a similar question that was raised here:
http://groups.google.com/group/google-appengine-java/browse_thread/thread/adf298a9a5b4bd03
Has anyone else seen this issue before?
Thanks
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