Ok thanks all...
I will read again about Hibernate sessions :-)
Cedric
On Tue, Sep 16, 2008 at 4:26 PM, Igor Vaynberg <[EMAIL PROTECTED]>wrote:
> +1
>
> -igor
>
> On Tue, Sep 16, 2008 at 1:24 PM, James Carman
> <[EMAIL PROTECTED]> wrote:
> > +1, OSIV works for me just fine, too. You must be doing something
> > weird. The OSIV doesn't commit transactions by default. So, it
> > shouldn't be doing anything weird.
> >
> > On Tue, Sep 16, 2008 at 1:07 PM, Michael Sparer <[EMAIL PROTECTED]>
> wrote:
> >>
> >> Before dropping OpenSessionInviewFilter I'd suggest to have a more
> thorough
> >> look at how hibernate works. e.g. have a look at the different cascade
> >> styles hibernate offers and also at transaction management, then it's
> easy
> >> to know why, and when, hibernate "commits" without explicitly calling
> save
> >> ... but that's no wicket topic after all. I'm using
> opensessioninviewfilter
> >> with loadabledetachablemodels in my webapp and never had problems ...
> >>
> >> just my two cents,
> >> Michael
> >>
> >>
> >> thiebal wrote:
> >>>
> >>> I had lots of problems with a Spring MVC webapp that was using
> >>> OpenSessionInViewFilter : beans were associated directly in DB when
> they
> >>> were added to a collection (like the current Foo/Bar case) even if I
> >>> didn't
> >>> commit explicitly.
> >>> Without the session opened, I can prepare all my entities and just save
> >>> them
> >>> and commit.
> >>>
> >>> I use this filter on another webapp that just load entities form DB but
> >>> does
> >>> not update them. It works perfectly!
> >>>
> >>> I though I would have the same kind of errors with Wicket because this
> is
> >>> not a Wicket part but just a Hibernate functionality.
> >>>
> >>> If in my case, I use the filter, the Bar.foos association will be
> loaded
> >>> just on demand but if I add it a new created Foo entity (transient), it
> >>> will
> >>> try to save it on flush (so before my save/commit) and I will have an
> >>> exception.
> >>> Maybe I'm wrong but I remember this kind of errors with Spring MVC...
> >>>
> >>> Cedric
> >>>
> >>>
> >>> On Tue, Sep 16, 2008 at 10:16 AM, James Carman
> >>> <[EMAIL PROTECTED]>wrote:
> >>>
> >>>> What problems does it cause?
> >>>>
> >>>> On Tue, Sep 16, 2008 at 9:14 AM, Cédric Thiébault
> >>>> <[EMAIL PROTECTED]> wrote:
> >>>> > Thanks Michael.
> >>>> >
> >>>> > But I don't use the OpenSessionInviewFilter and I don't want to use
> it.
> >>>> > It creates more problems than it solves in my edit pages.
> >>>> >
> >>>> > The LoadableDetachableModel will load the whole list of choices, not
> >>>> > just the one that was selected by the user.
> >>>> > I will encounter the same error except if the
> >>>> > LoadableDetachableModel.load method pre-fetch the associations...
> >>>> >
> >>>> > Cedric
> >>>> >
> >>>> >
> >>>> > On Tue, Sep 16, 2008 at 3:01 AM, Michael Sparer <
> [EMAIL PROTECTED]>
> >>>> wrote:
> >>>> >>
> >>>> >> Use LoadableDetachableModels (and be sure that the
> >>>> OpensessionInviewFilter
> >>>> >> goes before the wicketfilter) and your hibernate entity will always
> be
> >>>> in
> >>>> >> the right session
> >>>> >>
> >>>> >> regards,
> >>>> >> Michael
> >>>> >>
> >>>> >> thiebal wrote:
> >>>> >>>
> >>>> >>> My DropDownChoice contains a list of hibernate entities that are
> not
> >>>> >>> fully loaded.
> >>>> >>> But when I select a value in the dropdown I receive a
> >>>> >>> LazyLoadingException because Wicket tries to add an entry in a
> >>>> >>> collection that was not previously loaded.
> >>>> >>>
> >>>> >>> I tried to use a Converter but it is not called because
> >>>> >>> PropertyResolverConverter set directly the value (because their
> >>>> >>> classes are compatible) :
> >>>> >>> if (clz.isAssignableFrom(object.getClass())) {
> >>>> >>> return object;
> >>>> >>> }
> >>>> >>>
> >>>> >>> It works if I preload each entry in the list of choices of the
> >>>> >>> DropDownChoice but it is very expensive. To display the dropdown,
> I
> >>>> >>> just need to retrieve the name of my hibernate entity, not the
> >>>> >>> collection inside this bean.
> >>>> >>> I would like to load the collection only when the user select an
> >>>> >>> option in the select.
> >>>> >>>
> >>>> >>> Code :
> >>>> >>> class Foo {
> >>>> >>> Bar bar;
> >>>> >>>
> >>>> >>> void setBar(Bar bar) {
> >>>> >>> this.bar = bar;
> >>>> >>> bar.getFoos().add(this); // this will throw a
> >>>> >>> LazyLoadingException if I don't fetch the collections before I
> render
> >>>> >>> the DropDownChoice
> >>>> >>> }
> >>>> >>> }
> >>>> >>>
> >>>> >>> class Bar {
> >>>> >>> Collection<Foo> foos;
> >>>> >>> }
> >>>> >>>
> >>>> >>> Is there a nice way to do that ?
> >>>> >>>
> >>>> >>> Thanks in advance :-)
> >>>> >>>
> >>>> >>> Cedric
> >>>> >>>
> >>>> >>>
> ---------------------------------------------------------------------
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> >>>> >>>
> >>>> >>>
> >>>> >>>
> >>>> >>
> >>>> >>
> >>>> >> -----
> >>>> >> Michael Sparer
> >>>> >> http://talk-on-tech.blogspot.com
> >>>> >> --
> >>>> >> View this message in context:
> >>>>
> http://www.nabble.com/DropDownChoice-and-lazy-loaded-choices-tp19501118p19506463.html
> >>>> >> Sent from the Wicket - User mailing list archive at Nabble.com.
> >>>> >>
> >>>> >>
> >>>> >>
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> >>>> >>
> >>>> >>
> >>>> >
> >>>> >
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> >>>> >
> >>>>
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> >>>>
> >>>>
> >>>
> >>>
> >>
> >>
> >> -----
> >> Michael Sparer
> >> http://talk-on-tech.blogspot.com
> >> --
> >> View this message in context:
> http://www.nabble.com/DropDownChoice-and-lazy-loaded-choices-tp19501118p19516254.html
> >> Sent from the Wicket - User mailing list archive at Nabble.com.
> >>
> >>
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> >>
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> >
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