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From e...@jpox.org
Subject Re: jdoPreClear on deleted instances
Date Wed, 20 Jul 2005 07:12:54 GMT


The below may look like an afirmative phrase, but it should be seem as of
"please shoot on me".

Can you help me on this?

Quoting erik@jpox.org:
>>>>>>>>>>>>>>>>>
> Thx,
>
> The NullPointException is happening on a collection field, which is lazy
> loaded
> by JPOX, but at this time, the field was not loaded.
>
> The JDO spec states the access to fields is not allowed, but the TCK test
> does
> in the jdoPreClear. If I'm correct, this situation is not determined by the
> spec, and we may have any kind of problems, from returning undetermined
> values
> to the user or raising exceptions to returning the correct value.
>
> Regards,
>>>>>>>>>>>>>>>>



>
> Quoting Craig Russell <Craig.Russell@Sun.COM>:
>
> > Hi Erik,
> >
> > On Jul 17, 2005, at 2:15 AM, erik@jpox.org wrote:
> >
> > > TCK: org.apache.jdo.tck.api.instancecallbacks.CallingJdoPreclear -
> > > JIRA #70
> > >
> > > During commit jdoPreClear is called in p-deleted instances.
> > > jdoPreClear is not
> > > enhanced, and access to persistent fields is not allowed on p-deleted
> > > instances, but the TCK does. Should jdoPreClear be called on p-deleted
> > > instances?
> >
> > Yes. The idea is that jdoPreClear cannot affect the persistent state
> > of instances because it's called during afterCompletion. And the
> > method is not enhanced so no one will ever know. The job of
> > jdoPreClear is to do any cleanup of the instance that might be needed
> > before it transitions to transient.
> >
> > Access to persistent fields (except for identity fields which can
> > always be accessed) of deleted instances is detected by enhanced code
> > that ends up calling the StateManager. While in jdoPreDelete, nothing
> > that the method does is mediated, which is why it cannot call other
> > methods that are enhanced!
> >
> > Craig
> >
> > Craig Russell
> > Architect, Sun Java Enterprise System http://java.sun.com/products/jdo
> > 408 276-5638 mailto:Craig.Russell@sun.com
> > P.S. A good JDO? O, Gasp!
> >
> >
>
>
>




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