nope you are right ... it's not useless ... apologies
I *think* the problem is in mapping (conceptually) from a mental RDBMS
model
to a GAE DS model ... where "entity group" might be mistaken for
"table" ...
:)
On Aug 26, 3:02 pm, "Jason (Google)" <apija...@google.com> wrote:
> Why do you indicate that the documentation is useless? The links I included
> above state this quite clearly: two entities will be in separate entity
> groups by default, even if they're the same kind. Entity groups DO NOT
> collect entities of the same kind. If you need transaction support, you'll
> need to explicitly set one entity as the parent of the other, which
> basically creates a hierarchy (tree) of entities -- this is an entity group.
> In JDO/JPA, you do this using owned relationships which is covered in my
> second link above.
> - Jason
>
>
>
> On Tue, Aug 25, 2009 at 2:33 PM, Larry Cable <larry.ca...@gmail.com> wrote:
>
> > I have exactly the same problem, I instantiate a number of @Entity
> > objects
> > (all of the same type) persist them, and flush them in the context of
> > the same
> > transaction.
>
> > Since they are all of the same type, and their are no relationships
> > (although there is
> > an @Embedded class/field) I would imagine that they are all modelled
> > as being in the
> > same entity group .. but apparently not.
>
> > The documentation is basically useless at this point ...
>
> > On Aug 15, 1:09 pm, Foreigner <foreigne...@gmail.com> wrote:
> > > While trying to do a bulk update on my entities using JPA I get the
> > > exception bellow.
> > > I understand that you can't do a bulk update on different entity groups
> > in
> > > the same transaction but I guess I don't quite understand what an entity
> > > group is and how I go about making all entities part of the same group I
> > > want.
>
> > > Thanks for the help.
>
> > > fbr
>
> > > Illegal argument
> > > org.datanucleus.exceptions.NucleusUserException: Illegal argument
> > > at
> > org.datanucleus.store.appengine.DatastoreExceptionTranslator.wrapIllegalArgumentException(DatastoreExceptionTranslator.java:42)
> > > at
> > org.datanucleus.store.appengine.RuntimeExceptionWrappingDatastoreService.put(RuntimeExceptionWrappingDatastoreService.java:106)
> > > at
> > org.datanucleus.store.appengine.DatastorePersistenceHandler.put(DatastorePersistenceHandler.java:125)
> > > at
> > org.datanucleus.store.appengine.DatastorePersistenceHandler.put(DatastorePersistenceHandler.java:94)
> > > at
> > org.datanucleus.store.appengine.DatastorePersistenceHandler.updateObject(DatastorePersistenceHandler.java:398)
> > > at
> > org.datanucleus.state.JDOStateManagerImpl.flush(JDOStateManagerImpl.java:4458)
> > > at
> > org.datanucleus.ObjectManagerImpl.flushInternal(ObjectManagerImpl.java:2807)
> > > at
> > org.datanucleus.ObjectManagerImpl.markDirty(ObjectManagerImpl.java:2617)
> > > at
> > org.datanucleus.state.JDOStateManagerImpl.postWriteField(JDOStateManagerImpl.java:4241)
> > > at
> > org.datanucleus.state.JDOStateManagerImpl.setObjectField(JDOStateManagerImpl.java:2287)
> > > at
> > com.yicook.entities.TwitterDailyTip.jdoSetlastSet(TwitterDailyTip.java)
> > > at
> > com.yicook.entities.TwitterDailyTip.setLastSet(TwitterDailyTip.java:36)
> > > at
> > com.yicook.control.bco.TwitterStatusSetterBCO.resetTDT(TwitterStatusSetterBCO.java:60)
> > > at
> > com.yicook.control.bco.TwitterStatusSetterBCO.execute(TwitterStatusSetterBCO.java:40)
> > > at
> > com.yicook.control.ApplicationController.executeControllers(ApplicationController.java:61)
> > > at
> > com.yicook.control.ApplicationController.dispatch(ApplicationController.java:41)
> > > at
> > com.yicook.servlets.FrontController.doPost(FrontController.java:31)
> > > at
> > com.yicook.servlets.FrontController.doGet(FrontController.java:25)
> > > at javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
> > > at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
> > > at
> > org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
> > > at
> > org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
> > > at
> > com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
> > > at
> > org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
> > > at
> > org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
> > > at
> > org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
> > > at
> > org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
> > > at
> > org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
> > > at
> > org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
> > > at
> > com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:54)
> > > at
> > org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
> > > at
> > com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:306)
> > > at
> > org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
> > > at org.mortbay.jetty.Server.handle(Server.java:313)
> > > at
> > org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
> > > at
> > org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:830)
> > > at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
> > > at
> > org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
> > > at
> > org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
> > > at
> > org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
> > > at
> > org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)
> > > Caused by: java.lang.IllegalArgumentException: can't operate on
> > > multiple entity groups in a single transaction. found both Element {
> > > type: "TwitterDailyTip"
> > > id: 77}
>
> > > and Element {
> > > type: "TwitterDailyTip"
> > > id: 78
>
> > > }- Hide quoted text -
>
> > > - Show quoted text -- Hide quoted text -
>
> - Show quoted text -
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