The error message detail is 'Object with
id "agp0cnV4bWFwcGVychkLEgdUd2VldGVyIgxrZXlkb3NhdHJ1Y2sM" is managed
by a different Object Manager.'
----------------------------------------
Looks like you are using more than one PersistenceManager (PM)
instance on the same object. Are you closing PM instances immediately
after use? I use the following pattern for PMs:
PersistenceManagerFactory pmf =
DataExchange.getPersistenceManagerFactory();
PersistenceManager pm = pmf.getPersistenceManager();
Transaction tx = pm.currentTransaction();
try
{
tx.begin();
// Do persistence stuff here...
tx.commit();
}
finally
{
try
{
if (tx.isActive()) // Because of an exception, say
tx.rollback();
}
finally
{
pm.close();
}
}
@Order(extensions = @Extension(vendorName="datanucleus", key="list-
ordering", value="key ASC"))
----------------------------------------
You have changed the Truck PK field name, so you should replace "key
ASC" with "keyName ASC".
Enjoy?
On Sep 27, 10:12 pm, culov <[email protected]> wrote:
> Ian-
>
> Thanks a lot for your reply. The error message detail is 'Object with
> id "agp0cnV4bWFwcGVychkLEgdUd2VldGVyIgxrZXlkb3NhdHJ1Y2sM" is managed
> by a different Object Manager.'
>
> The objects aren't being handled by any other method except the
> addTrucks method in my DAO. They are never added to the datastore.
> I've changed the code around a bit. I'm now assigning keys using a
> unique id. Tweeter now looks like...
>
> @PrimaryKey
> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> @Extension(vendorName="datanucleus", key="gae.encoded-pk",
> value="true")
> private String encodedKey;
> @Persistent
> @Extension(vendorName="datanucleus", key="gae.pk-name",
> value="true")
> private String keyName;
> ....
> @Persistent(mappedBy = "tweeter")
> @Order(extensions = @Extension(vendorName="datanucleus",
> key="list-
> ordering", value="key ASC"))
> private List<Truck> trucks;
>
> and Truck:
> @PrimaryKey
> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> @Extension(vendorName="datanucleus", key="gae.encoded-pk",
> value="true")
> private String encodedKey;
> @Persistent
> @Extension(vendorName="datanucleus", key="gae.pk-name", value="true")
> private String keyName;
> ....
> @Persistent(dependent = "true")
> private Tweeter tweeter;
>
> I have a feeling that I'm just not modelling the situation correctly.
> The case would more accurately be defined as N-1, because I will never
> access the List of Trucks stored in the Tweeter object.... I only want
> to access the Tweeter object stored in each truck. It really seems
> like it should be very simple.
>
> Thanks alot!
> On Sep 27, 1:18 am, Ian Marshall <[email protected]> wrote:
>
> > Two things....
>
> > 1. More importantly, what is the detail of your
> > javax.jdo.JDOUserException, and what is your code that is associated
> > with this exception?
>
> > 2. I personally use bi-directional relationships between parent and
> > children. So in your case, you could add to your Tweeter class:
>
> > @Persistent(mappedBy="tweeter")
> > @Element(dependent="true")
> > @Order(extensions = @Extension(vendorName="datanucleus", key="list-
> > ordering", value="key ASC"))
> > private ArrayList<Truck> liTrucks = new ArrayList<Truck>();
>
> > but you might want to omit the "@Element" line.
>
> > On Sep 26, 11:07 pm, culov <[email protected]> wrote:
>
> > > I'm looking to tighten up some of my server-side code, but I'm having
> > > trouble properly establishing the relationship between entities.
> > > Before, I was using unencoded Strings as keys, but after reading the
> > > documentation here, I've changed them to encoded app-generated
> > > Strings.
>
> > > I have two Entities, Trucks and Tweeters. What I'd like is an
> > > accessible Tweeter inside every Truck. Every truck has to have a
> > > Tweeter associated with it (there may be many Trucks with the same
> > > Tweeter), but a Tweeter may have no Trucks. Thus, the Tweeter should
> > > be the parent, and the Truck the child. I'm having lots of trouble
> > > persisting the classes in the datastore and I'm hoping someone can
> > > look over how I created the classes and detect my errors. Currently im
> > > getting a javax.jdo.JDOUserException. When I try to persist a Truck
> > > object. Here's the relevant portion of my child class, Truck:
>
> > > @PrimaryKey
> > > @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> > > @Extension(vendorName="datanucleus", key="gae.encoded-pk",
> > > value="true")
> > > private String key;
> > > ....
> > > @Persistent(defaultFetchGroup = "true")
> > > private Tweeter tweeter;
> > > and the parent, Tweeter:
>
> > > @PrimaryKey
> > > @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> > > @Extension(vendorName="datanucleus", key="gae.encoded-pk",
> > > value="true")
> > > private String key;
> > > I never set any of the keys anywhere, and based on the logs, the keys
> > > are being set as they should be. I think there must be a critical
> > > misunderstanding of the relationship on my part thats leading me to
> > > see an error regardless of what I try. I know I can use
> > > com.google.appengine.api.datastore.Key, but my classes are also used
> > > client-side by GWT, so I can't import the Key class from the GAE
> > > library.
>
> > > Thanks so much for the help!
>
>
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