thanks for your answers: Pierre, the StreamingQueryResult is not serializable. However, to my understanding this problem is alleviated when you work with detached objects since you call something like
Collection c = pm.detachCopyAll(resultList); at the end and you are then returning the instance c Rusty, I am creating a wicket-based application from scratch. At the beginning I included spring for dependency injection, transactions, and open session in view behavior. However, I got rid of spring since its behavior in terms of transactions is mosty not required on GAE and also sometimes not completely clear to me. OSIV is nice, but I trying to do that by means of wicket only (if required since we don't work with so many tables as in web application having relational datastores. without spring I am currently not experiencing big problems with detached objects. regards, andr On 10 Nov., 22:54, Rusty Wright <rwright.li...@gmail.com> wrote: > I'm finding that it's nearly impossible to work with the detaching objects > style. I can't tell for sure what's happening other than when I add a > PersistenceCapable object to another PersistenceCapable object's collection > (i.e., the first one will be the child of the second one) that I get an error > about trying to persist objects in different entity groups in the same > transaction. > > I'm using Spring and subclassing JdoDaoSupport and the transactions are > handled for me; I'm not sure if that's part of the problem. With > JdoDaoSupport I never need to open or close the persistence manager or start > and commit transactions, although I do have an xml file that does the aop > proxy wrapping of my classes. > > > > a.mazawrote: > > I've used the merging of transient objects approach for a while as > > described > > inhttp://timepedia.blogspot.com/2009/04/google-appengine-and-gwt-now-ma... > > and it works quite fine. I only subsituted the proposed implementation > > of copying fields by dozer. > > > However, I am still thinking to move to the "detaching objects" > > approach and played around with it a bit. So far, the detaching > > objects approachs seems more cumbersome to me... > > > I would be happy to hear some thoughts... > > > regards, > > andr- Zitierten Text ausblenden - > > - Zitierten Text anzeigen - --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
