Hi,
I never really used OpenSessionInViewFilter, but I remember Juergen
Hoeller saying that he sometimes wished he never wrote OSIV because of
all the potential side-effects.
At the time a ridiculous big percentage of questions on the spring
forum where about OSIV.
This was several years ago though, and I have the impression that a
lot of people are using OSIV now without problems.
I guess it all works fine when you know what you're doing :-)
Maarten
On Tue, Sep 16, 2008 at 10:28 PM, Cédric Thiébault
<[EMAIL PROTECTED]> wrote:
> 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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>
