[appengine-java] JDO - Add a child - Error
Hi! I have a problem when add a class Equipo(child) one
Torneo(parent).
The code:
Transaction tx = pm.currentTransaction();
try {
tx.begin();
unTorneo.agregarEquipo(unEquipo);
//pm.makePersistent(unEquipo);
Torneo tor = (Torneo) pm.detachCopy(unTorneo);
pm.makePersistent(tor);
tx.commit();
System.out.println(persistioTorneoConEquipo);
} finally {
//pm.close();
if (tx.isActive()) {
tx.rollback();
}
}
}
The exception:
INTERNAL_SERVER_ERROR
Caused by:
java.lang.NullPointerException
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.deleteObject(DatastorePersistenceHandler.java:
581)
at
org.datanucleus.store.appengine.DatastoreFKListStoreSpecialization.removeAt(DatastoreFKListStoreSpecialization.java:
145)
at
org.datanucleus.store.mapped.scostore.FKListStore.removeAt(FKListStore.java:
525)
at
org.datanucleus.store.mapped.scostore.AbstractListStore.remove(AbstractListStore.java:
318)
at org.datanucleus.sco.backed.List.remove(List.java:907)
at org.datanucleus.sco.SCOListIterator.remove(SCOListIterator.java:
145)
at
org.datanucleus.sco.SCOUtils.updateListWithListElements(SCOUtils.java:
828)
at org.datanucleus.sco.simple.List.attachCopy(List.java:232)
at
org.datanucleus.store.fieldmanager.AttachFieldManager.storeObjectField(AttachFieldManager.java:
205)
at
org.datanucleus.state.AbstractStateManager.providedObjectField(AbstractStateManager.java:
1037)
at model.Torneo.jdoProvideField(Torneo.java)
at model.Torneo.jdoProvideFields(Torneo.java)
at
org.datanucleus.state.JDOStateManagerImpl.provideFields(JDOStateManagerImpl.java:
2715)
at
org.datanucleus.state.JDOStateManagerImpl.internalAttachCopy(JDOStateManagerImpl.java:
4055)
at
org.datanucleus.state.JDOStateManagerImpl.attachCopy(JDOStateManagerImpl.java:
3987)
at
org.datanucleus.ObjectManagerImpl.attachObjectCopy(ObjectManagerImpl.java:
1778)
at
org.datanucleus.ObjectManagerImpl.persistObjectInternal(ObjectManagerImpl.java:
1260)
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
controllers.ControladorTorneo.agregarEquipoConTorneo(ControladorTorneo.java:
135)
at struts.action.NuevoEquipo.execute(NuevoEquipo.java:38)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
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