Just so you know, I think I have solved the problem by setting defaultFetchGroup="true" on the Key property:
@Persistent(defaultFetchGroup="true") private Key text; Might have something to do with the recently closed issue #58 "Queries don't respect fetch groups": http://code.google.com/p/datanucleus-appengine/issues/detail?id=58 What's puzzling is that I have unowned relationships all over the application, however only one class - CMSPage - fails to retrieve the Key properties. I am not sure why Key is not automatically in the default fetch group. Key is not an entity class. It should be ok to fetch it non-lazily by default. Yegor On Sep 4, 1:21 pm, Yegor <yegor.jba...@gmail.com> wrote: > Hi, > > I am experiencing a problem after upgrading to Java SDK 1.2.5. In a > simple CMS application a page is stored as a CMSPage entity, which > points to its text saved as a DetachedText entity using a Key property > (i.e. an unowned relationship) as follows: > > @PersistenceCapable(identityType = IdentityType.APPLICATION) > public class CMSPage { > > @PrimaryKey > @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) > private Key id; > > @Persistent > private Key text; > > public Key getId() { > return id; > } > > public void setId(Key id) { > this.id = id; > } > > public Key getText() { > return text; > } > > public void setText(Key text) { > this.text = text; > } > > } > > The Key property "text" points to: > > @PersistenceCapable(identityType = IdentityType.APPLICATION) > public class DetachedText { > > @PrimaryKey > @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) > private Key id; > > @Persistent > private Text content; > > public DetachedText(Text content) { > this.content = content; > } > > public Key getId() { > return id; > } > > public Text getContent() { > return content; > } > > } > > NOTE: I have removed other properties and code that I found unrelated > to the problem > > After saving the page I can see the "text" field populated in the > development console. The value shows as "DetachedText(5)". I also > verified that the DetachedText entity exists and its ID equals 5. > > However, after I retrieve CMSPage from the datastore using a > javax.jdo.Query the "text" field in the retrieved object is null (both > the Eclipse debugger and the application throwing NPE confirm it). > > What am I doing wrong? > > Any pointers will be appreciated. > > Thanks, > > Yegor --~--~---------~--~----~------------~-------~--~----~ 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-java@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 -~----------~----~----~----~------~----~------~--~---
