Hi! Thaks Cyrille, The link has served me. Regards Lisandro On 8 sep, 12:03, Cyrille Vincey <[email protected]> wrote: > Go > there...http://code.google.com/intl/fr-FR/appengine/docs/java/datastore/relat... > s.html#Polymorphic_Relationships > > ... And you'll read this : > " Even though the JDO specification includes support for polymorphic > relationships, polymorhpic relationships are not yet supported in the App > Engine JDO implementation. This is a limitation we hope to remove in future > releases of the product. If you need to refer to multiple types of objects > via a common base class we recommend following the same strategy we > recommend for implementing unowned relationships: store a Key reference." > > Bye. > > On 08/09/10 02:14, "lisandrodc" <[email protected]> wrote: > > > Thanks Cyrille, but.. > > Might someone confirm to me authentically that really inheritance is > > not supported? > > If it is like that, a serious enough failing.... > > On the part of the documentation of google it does not confirm it but > > he > > does not deny it either... > > The error is "error. > > org.datanucleus.exceptions.NoPersistenceInformationException: The > > class "com.onwebconsulting.inventory.model.Part" is required to be > > persistable yet no Meta-Data/Annotations can be found for this class. > > Please check that the Meta-Data/annotations is defined in a valid > > file" > > > Regards > > Lisandro > > On 7 sep, 09:48, Cyrille Vincey <[email protected]> wrote: > >> I have read somewhere in the appengine doc that class inheritance is not > >> really supported by JDO yet... > > >> On 07/09/10 00:39, "lisandrodc" <[email protected]> wrote: > > >>> Hi all, > >>> I've used hibernate for a while, and I'm having a bit of trouble > >>> switching to JDO. I have several entities that all entities will > >>> share. Rather than a parent table, I'd prefer these columns be > >>> embedded directly in each entity. As such, I've defined my abstract > >>> entity and child entity in the classes below. However, whenever I > >>> try > >>> to run my unit tests or the jetty environment, I always receive the > >>> following error. > >>> org.datanucleus.exceptions.NoPersistenceInformationException: The > >>> class "com.onwebconsulting.inventory.model.Part" is required to be > >>> persistable yet no Meta-Data/Annotations can be found for this class. > >>> Please check that the Meta-Data/annotations is defined in a valid > >>> file > >>> location.]] > >>> According to my Eclipse console I have 1 class that has been > >>> Enhanced. Any ideas what I'm doing wrong? > >>> DataNucleus Enhancer completed with success for 1 classes. Timings : > >>> input=268 ms, enhance=51 ms, total=319 ms. Consult the log for full > >>> details > >>> @Inheritance(strategy = InheritanceStrategy.NEW_TABLE) > >>> public class Part extends Auditable{ > >>> @Persistent > >>> private String name; > >>> @Persistent > >>> private String description; > >>> @Persistent > >>> private String partNumber; > >>> @Persistent > >>> private long quantity; > >>> @Persistent > >>> private String manuacturersPartNumber; > >>> @Persistent > >>> private String manufacturerName; > >>> @Persistent > >>> private String suppliersPartNumber; > >>> @Persistent > >>> private String supplierName; > >>> @Persistent > >>> private String supplierWebsite; > >>> @Persistent > >>> private float salePrice; > >>> @Persistent > >>> private float supplierPrice; > >>> ... Getters and Setters > >>> } > >>> @PersistenceCapable(identityType = IdentityType.APPLICATION) > >>> @Inheritance(strategy = InheritanceStrategy.SUBCLASS_TABLE) > >>> public abstract class Auditable { > >>> @PrimaryKey > >>> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) > >>> private Key id; > >>> @Persistent > >>> private Date createDate; > >>> @Persistent > >>> private Date updatedDate; > >>> @Persistent > >>> private long version; > >>> public Key getId() { > >>> return id; > >>> } > >>> public Date getCreateDate() { > >>> return createDate; > >>> } > >>> public Date getUpdatedDate() { > >>> return updatedDate; > >>> } > >>> public long getVersion(){ > >>> return version; > >>> } > >
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