Be aware that inheritance is not supported by GAE yet.
The problem might come from this issue.
See :
http://code.google.com/intl/fr-FR/appengine/docs/java/datastore/dataclasses.
html
cyrille
On 19/09/10 18:55, "lisandrodc" <lisandr...@gmail.com> wrote:
> Thanks dushyant , but the exception is of an error of JDO,datanucleus
> (seemingly).
> That it has to see with the keys it seems to me, is not the problem
> that I from my code
> can use "Long.parseLong(String) to parse". This is something internal
> that that should do datanucleus.
> Regards.
> Lisandro
>
> On 19 sep, 12:19, dushyant bing <dush...@gmail.com> wrote:
>> java.lang.ClassCastException: java.lang.Long cannot be cast to
>> java.lang.String
>>
>> use Long.parseLong(String) to parse
>>
>> Sent from my iPad
>>
>> On Sep 19, 2010, at 7:52 PM, lisandrodc <lisandr...@gmail.com> wrote:
>>
>> Hi! I have a problem with persist a child class.
>> The classes are:
>>
>> The parent class:
>>
>> @PersistenceCapable
>>
>> @Inheritance(strategy = InheritanceStrategy.SUBCLASS_TABLE)
>> public abstract class Fecha {
>>
>> @PrimaryKey
>> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
>> private Key id;
>> @Persistent
>> private String nombre;
>> @Persistent
>> private Date
>> @Persistent
>> private Date fechaFin;
>>
>> @Persistent(defaultFetchGroup = "true")
>> List<Partido> partidos;
>>
>> The child class:
>>
>> @PersistenceCapable
>>
>> public class RegFechaUsuario extends Fecha {
>>
>> @Persistent
>> private int puntos;
>> @Persistent
>> private Long idUsuarioFecha;
>> @Persistent
>> private Long idFechaOriginal;
>>
>> And the code of run the exception is:
>> Transaction tx = pm.currentTransaction();
>> try {
>> tx.begin();
>>
>> pm.makePersistentAll(regFechaUsuario);
>> //here is the exception
>> tx.commit();
>>
>> And the regFechaUsuario is created with the build:
>>
>> public RegFechaUsuario(String nombre, Date fechaIni, Date fechaFin,
>> Long idUsuarioFecha, Long idFechaOriginal, List<Partido>partidos)
>> {
>> //super(nombre,fechaIni,fechaFin,partidos);
>> this.puntos = 0;
>> this.idUsuarioFecha = idUsuarioFecha;
>> this.idFechaOriginal = idFechaOriginal;
>> this.partidos=partidos;
>>
>> }
>>
>> The exception is:
>> Problem accessing /Prode/JugarFecha.action. Reason:
>>
>> java.lang.Long cannot be cast to java.lang.String
>>
>> Caused by:
>>
>> java.lang.ClassCastException: java.lang.Long cannot be cast to
>> java.lang.String
>> at
>> org.datanucleus.store.appengine.DatastoreRelationFieldManager.checkForParentS
>> witch(DatastoreRelationFieldManager.java:
>> 202)
>> at org.datanucleus.store.appengine.DatastoreRelationFieldManager
>> $1.setObjectViaMapping(DatastoreRelationFieldManager.java:133)
>> at org.datanucleus.store.appengine.DatastoreRelationFieldManager
>> $1.apply(DatastoreRelationFieldManager.java:112)
>> at
>> org.datanucleus.store.appengine.DatastoreRelationFieldManager.storeRelations(
>> DatastoreRelationFieldManager.java:
>> 81)
>> at
>> org.datanucleus.store.appengine.DatastoreFieldManager.storeRelations(Datastor
>> eFieldManager.java:
>> 955)
>> at
>> org.datanucleus.store.appengine.DatastorePersistenceHandler.storeRelations(Da
>> tastorePersistenceHandler.java:
>> 546)
>> at org.datanucleus.store.appengine.DatastorePersistenceHandler.
>>
>> Regards
>> Lisandro
>>
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