[appengine-java] Re: Using @EmbeddedID and @Embedded with JPA ...
should'a RTFM'ed :) On Aug 27, 1:20 am, datanucleus wrote: > > btw why does em.flush() throw an exception declaring that it requires > > a transaction and that there is none in context when the Persistence > > Provider is clearly configured for non-tx writes > > You mean according to the JPA spec 3.1.1, for flush() > > @throws TransactionRequiredException if there is no transaction > > > so it complies with the JPA TCK then. Don't call flush in a non-tx > context. > > --Andy (DataNucleus) --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
[appengine-java] Re: Using @EmbeddedID and @Embedded with JPA ...
> btw why does em.flush() throw an exception declaring that it requires > a transaction and that there is none in context when the Persistence > Provider is clearly configured for non-tx writes You mean according to the JPA spec 3.1.1, for flush() @throws TransactionRequiredException if there is no transaction so it complies with the JPA TCK then. Don't call flush in a non-tx context. --Andy (DataNucleus) --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
[appengine-java] Re: Using @EmbeddedID and @Embedded with JPA ...
that's funny because it seems to "work"; well when I say work,
em.persist() of such an entity does not throw ... I'll see what
happens when I try to query an object with such a key ...
errr ... also parenthetically, if it doesn't support @EmbeddedId then
it's not really a conformant implementation of JPA ... :D
btw why does em.flush() throw an exception declaring that it requires
a transaction and that there is none in context when the Persistence
Provider is clearly configured for
non transactional read/writes, surely a flush() would either silently
"do nothing" or commit/write any pending objects to the ds???
:)
Thanks
- larry
On Aug 26, 2:57 pm, "Jason (Google)" wrote:
> You have four choices for key type which are described
> athttp://code.google.com/appengine/docs/java/datastore/creatinggettinga
> An embedded Id won't work with App Engine since it can't be naturally
> represented as a Key object.
> - Jason
>
>
>
> On Tue, Aug 25, 2009 at 2:09 PM, Larry Cable wrote:
>
> > I have given up, seems like this is not supported, the runtime
> > complains that the "MyId" class is not a supported Key Class ... go
> > figure ...
>
> > On Aug 24, 4:15 pm, Larry Cable wrote:
> > > Has anyone managed to get @EmbeddedId with JPA to work in GAE/
> > > DataNucleus???
>
> > > @Entity
> > > public class MyEntity {
> > > //...
> > > @EmbeddedId public MyId id;
>
> > > }
>
> > > // ...
>
> > > @Embeddable
> > > public class MyId {
> > > //...
>
> > > public String id;
>
> > > }
>
> > > I'm getting an "unsupported primary key type" exception at runtime
> > > during em.flush()
>
> > > any thoughts? examples of working code?
>
> > > I am pretty sure it's pilot error ... but the documentation for this
> > > is pretty thin on the ground ...
>
> > > will try and isolate an actual "working" example and post that here
> > > also ...- Hide quoted text -
>
> - Show quoted text -
--~--~-~--~~~---~--~~
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
-~--~~~~--~~--~--~---
[appengine-java] Re: Using @EmbeddedID and @Embedded with JPA ...
You have four choices for key type which are described at
http://code.google.com/appengine/docs/java/datastore/creatinggettinganddeletingdata.html#Keys.
An embedded Id won't work with App Engine since it can't be naturally
represented as a Key object.
- Jason
On Tue, Aug 25, 2009 at 2:09 PM, Larry Cable wrote:
>
> I have given up, seems like this is not supported, the runtime
> complains that the "MyId" class is not a supported Key Class ... go
> figure ...
>
> On Aug 24, 4:15 pm, Larry Cable wrote:
> > Has anyone managed to get @EmbeddedId with JPA to work in GAE/
> > DataNucleus???
> >
> > @Entity
> > public class MyEntity {
> > //...
> > @EmbeddedId public MyId id;
> >
> > }
> >
> > // ...
> >
> > @Embeddable
> > public class MyId {
> > //...
> >
> > public String id;
> >
> > }
> >
> > I'm getting an "unsupported primary key type" exception at runtime
> > during em.flush()
> >
> > any thoughts? examples of working code?
> >
> > I am pretty sure it's pilot error ... but the documentation for this
> > is pretty thin on the ground ...
> >
> > will try and isolate an actual "working" example and post that here
> > also ...
> >
>
--~--~-~--~~~---~--~~
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
-~--~~~~--~~--~--~---
[appengine-java] Re: Using @EmbeddedID and @Embedded with JPA ...
I have given up, seems like this is not supported, the runtime
complains that the "MyId" class is not a supported Key Class ... go
figure ...
On Aug 24, 4:15 pm, Larry Cable wrote:
> Has anyone managed to get @EmbeddedId with JPA to work in GAE/
> DataNucleus???
>
> @Entity
> public class MyEntity {
> //...
> @EmbeddedId public MyId id;
>
> }
>
> // ...
>
> @Embeddable
> public class MyId {
> //...
>
> public String id;
>
> }
>
> I'm getting an "unsupported primary key type" exception at runtime
> during em.flush()
>
> any thoughts? examples of working code?
>
> I am pretty sure it's pilot error ... but the documentation for this
> is pretty thin on the ground ...
>
> will try and isolate an actual "working" example and post that here
> also ...
--~--~-~--~~~---~--~~
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
-~--~~~~--~~--~--~---
