Go there... http://code.google.com/intl/fr-FR/appengine/docs/java/datastore/relationship 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" <lisandr...@gmail.com> 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 <crll...@gmail.com> 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" <lisandr...@gmail.com> 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; >>> } >> >> -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.