You should probably read this as well: http://www.datanucleus.org/products/accessplatform_1_1/jdo/attach_detach.html
On Fri, Nov 13, 2009 at 1:31 PM, IlyaE <[email protected]> wrote: > I'm not detaching the object. Should i be? Do i still need modified > fetching code if i use detached objects? > > On Nov 13, 4:23 pm, "Max Ross (Google)" > <[email protected]<maxr%[email protected]> > > > wrote: > > Can you please post the code where you're actually detaching the Project > > object? > > > > > > > > On Fri, Nov 13, 2009 at 1:15 PM, IlyaE <[email protected]> wrote: > > > It seems rather simple enough but i still cannot get it working > > > correctly. I set the annotations in my classes and modified the PM > > > factory > > > > > [Account] > > > @Persistent(mappedBy = "account", defaultFetchGroup="true") > > > private List<Key> projects; > > > > > [Project] > > > @Persistent(defaultFetchGroup="true") > > > private Key account; > > > > > [Factory] (based off starter GAE project documentation) > > > public static PersistenceManagerFactory get() { > > > FetchPlan fp = > > > pmfInstance.getPersistenceManager().getFetchPlan(); > > > fp.setGroup(FetchPlan.DEFAULT); > > > > > return pmfInstance; > > > } > > > > > I'm still seeing the same null pointer exception. > > > > > On Nov 13, 3:28 pm, "Max Ross (Google)" > > > <[email protected]<maxr%[email protected]> > <maxr%[email protected] <maxr%[email protected]>> > > > > > wrote: > > > > That sounds like a good topic for a Snippets That Work blog post. I > > > don't > > > > have time to construct the example for you but I'd recommend reading > > > > > > > http://www.datanucleus.org/products/accessplatform_1_1/jdo/fetchgroup... > > > > > > If after reading this you're still not able to get your code working, > > > please > > > > post your model objects and your code and I can take a look. > > > > > > Max > > > > > > On Fri, Nov 13, 2009 at 11:49 AM, IlyaE <[email protected]> > wrote: > > > > > Max, > > > > > > > Can you please provide an example of how to set the Account in a > fetch > > > > > group? What about detaching the entire Project object and then > saving > > > > > it in the session? > > > > > > > On Nov 13, 1:50 pm, "Max Ross (Google)" > > > > > <[email protected]<maxr%[email protected]> > <maxr%[email protected] <maxr%[email protected]>> > > > <maxr%[email protected] <maxr%[email protected]> < > maxr%[email protected] <maxr%[email protected]>>> > > > > > > > wrote: > > > > > > Presumably you have a Project in your HttpSession with a null > > > Account. > > > > > This > > > > > > is most likely related to FetchGroups. You probably want to put > your > > > > > > Project.account field in the default fetch group. That way it > will > > > > > always > > > > > > be available when you close the persistence manager you used to > load > > > the > > > > > > Project. > > > > > > > > On Thu, Nov 12, 2009 at 7:29 PM, IlyaE <[email protected]> > wrote: > > > > > > > I'm seeing an odd issue when loading my jsps for the first time > > > (after > > > > > > > deployment). > > > > > > > > > I have an Account object that has many Projects > > > > > > > [Account] > > > > > > > @Persistent(mappedBy = "account") > > > > > > > private List<Key> projects; > > > > > > > > > and on the otherside > > > > > > > [Project] > > > > > > > @Persistent > > > > > > > private Key account; > > > > > > > > > Now when i first load my jsp that is forwarded from a servlet, > i > > > get a > > > > > > > NPE on the "Long id = p.getAccount().getId();" in this code > > > > > > > > > Project p = (Project) > > > > > request.getSession().getAttribute("project"); > > > > > > > Account account = null; > > > > > > > if (p != null) { > > > > > > > Long id = p.getAccount().getId(); > > > > > > > account = pm.getObjectById(Account.class, id); > > > > > > > > > I know p is not null (since this code runs) and i know that it > is > > > > > > > associated with an account. > > > > > > > > > The really odd thing is... If i refresh the page, everything > works > > > as > > > > > > > expected. So this NPE only occurs after i deploy a new version > of > > > the > > > > > > > app, or certain files expire. > > > > > > > Do i need to initialize anything? > > > > > > > > > Thanks! > > > > > > > > > -- > > > > > > > > > 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 > > > > > > > [email protected]. > > > > > > > To unsubscribe from this group, send email to > > > > > > > [email protected]<google-appengine-java%[email protected]><google-appengine-java%2B > [email protected]><google-appengine-java%2B > > > [email protected]><google-appengine-java%2B > > > > > [email protected]> > > > > > > > . > > > > > > > For more options, visit this group at > > > > > > >http://groups.google.com/group/google-appengine-java?hl=. > > > > > > > -- > > > > > > > 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 > > > > > [email protected]. > > > > > To unsubscribe from this group, send email to > > > > > [email protected]<google-appengine-java%[email protected]><google-appengine-java%2B > [email protected]><google-appengine-java%2B > > > [email protected]> > > > > > . > > > > > For more options, visit this group at > > > > >http://groups.google.com/group/google-appengine-java?hl=. > > > > > -- > > > > > 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 > > > [email protected]. > > > To unsubscribe from this group, send email to > > > [email protected]<google-appengine-java%[email protected]><google-appengine-java%2B > [email protected]> > > > . > > > For more options, visit this group at > > >http://groups.google.com/group/google-appengine-java?hl=. > > -- > > 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 > [email protected]. > To unsubscribe from this group, send email to > [email protected]<google-appengine-java%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=. > > > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. 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