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 <ilyaelk...@gmail.com> 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)"
> <maxr+appeng...@google.com<maxr%2bappeng...@google.com>
> >
> 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 <ilyaelk...@gmail.com> 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)"
> > > <maxr+appeng...@google.com<maxr%2bappeng...@google.com>
> <maxr%2bappeng...@google.com <maxr%252bappeng...@google.com>>
> >
> > > 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 <ilyaelk...@gmail.com>
> 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)"
> > > > > <maxr+appeng...@google.com<maxr%2bappeng...@google.com>
> <maxr%2bappeng...@google.com <maxr%252bappeng...@google.com>>
> > > <maxr%2bappeng...@google.com <maxr%252bappeng...@google.com> <
> maxr%252bappeng...@google.com <maxr%25252bappeng...@google.com>>>
> >
> > > > > 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 <ilyaelk...@gmail.com>
> 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!
> >
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