Hi. I've answered this also on the db4o forum. This is a copy of my
answer:
Which version of db4o are you using?
To me that looks like some kind of regression / accidental API
breakage. Instead of the UniqueFieldValueConstraintViolationException
the EventException is thrown. The unique-field detection is just
another event handler. So it looks like the original
UniqueFieldValueConstraintViolationException is hidden by the event-
exception
Try to catch the EventException an check if the .getCause() is a
UniqueFieldValueConstraintViolationException.
In general the UniqueFieldValueConstraintViolationException should
be the last 'barrier' before violating the constrain. If you know that
you probably will insert a doublicate then I recommend to first check
if that id isn't used yet.
On Jun 22, 3:29 pm, imran ali <imran...@gmail.com> wrote:
> Hi All,
>
> in one of my application i have been downloading lots of data from
> server and then saving in to db4o.
>
> in my case i am saving 200 objects of Recipe class in loops, and on
> every 200 store, i am using commit().
>
> in Recipe Class i have define id as unique as follows
>
> configuration.common().add(new
> UniqueFieldValueConstraint(Recipe.class, "id"));
> when i have been commiting after 200 stor,e it has been throwing
> exception,code at comit is as follows
>
> public void commitdb()
>
> {
>
> try
>
> {
>
> oc.commit(); // oc is object of objectContainer
>
> }
>
> catch(UniqueFieldValueConstraintViolationException exp)
>
> { oc.rollback(); }
>
> }
>
> Still i am getting exception as follows, (i am using db4o on Android)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823):
> com.db4o.events.EventException
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.internal.events.EventRegistryImpl.withExceptionHandlingInCallback(EventRegistryImpl.java:
> 283)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.internal.events.EventRegistryImpl.commitOnStarted(EventRegistryImpl.java:
> 121)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.internal.LocalTransaction.dispatchCommittingCallback(LocalTransaction.java:
> 90)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.internal.LocalTransaction.commit(LocalTransaction.java:65)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.internal.LocalTransaction.commit(LocalTransaction.java:59)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.internal.LocalObjectContainer.commit1(LocalObjectContainer.java:
> 104)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.internal.IoAdaptedObjectContainer.commit1(IoAdaptedObjectContainer.java:
> 171)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.internal.ObjectContainerBase$3.apply(ObjectContainerBase.java:
> 403)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.internal.ObjectContainerBase$3.apply(ObjectContainerBase.java:
> 401)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.internal.ObjectContainerBase.asTopLevelCall(ObjectContainerBase.java:
> 427)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.internal.ObjectContainerBase.commit(ObjectContainerBase.java:
> 401)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.internal.ExternalObjectContainer.commit(ExternalObjectContainer.java:
> 39)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.altaworks.kokaihop.db4o.RecipeProvider.commitdb(RecipeProvider.java:
> 42)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.altaworks.kokaihop.ui.TakeoffActivity$4.run(TakeoffActivity.java:
> 707)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> java.lang.Thread.run(Thread.java:1096)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): Caused by:
> java.lang.NullPointerException
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.constraints.UniqueFieldValueConstraint
> $1.ensureSingleOccurence(UniqueFieldValueConstraint.java:59)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.constraints.UniqueFieldValueConstraint
> $1.onEvent(UniqueFieldValueConstraint.java:96)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.internal.events.Event4Impl.trigger(Event4Impl.java:78)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.internal.events.EventRegistryImpl
> $4.run(EventRegistryImpl.java:123)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.foundation.DynamicVariable.with(DynamicVariable.java:54)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.internal.InCallback.run(InCallback.java:24)
>
> 06-22 18:30:41.568: ERROR/AndroidRuntime(14823): at
> com.db4o.internal.events.EventRegistryImpl.withExceptionHandlingInCallback(EventRegistryImpl.java:
> 279)
>
> What should be solution, i have to store all 200 objects, and if
> already object is present with same id, then over-write with new
> object?
>
> Regards
> Imran ali
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