I tried both but it was worst with multiple session because entities
were already associated in an other session and it throws
exceptions...
On Thu, Sep 18, 2008 at 10:17 AM, James Carman
<[EMAIL PROTECTED]> wrote:
> Are you using the single session setting on OSIV? Or, are you using
> multiple sessions?
>
> On Thu, Sep 18, 2008 at 9:12 AM, Cédric Thiébault
> <[EMAIL PROTECTED]> wrote:
>> In fact my example with the collection updating automatically was
>> wrong... because, as it was said, the transaction is not committed at
>> the end.
>>
>> But I remember other kind of problems when I wanted to save and commit
>> my modified entities after I loaded and associated them during the
>> request (via OSIV) :
>> I was passing a graph of persistent objects to the manager and I had
>> exception like "a different object with the same identifier value was
>> already associated with the session".
>> I tried then to use a merge but in this case I had other exception (I
>> don't remember exactly which one)...
>>
>> If I don't use OSIV and pass a graph of transient object, it works fine!
>>
>> It must be something wrong with my hibernate mapping but it hard to locate
>> :-(
>>
>> Cedric
>>
>>
>> On Thu, Sep 18, 2008 at 3:26 AM, Maarten Bosteels
>> <[EMAIL PROTECTED]> wrote:
>>>
>>> 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
>>> >> >>>> >>>
>>> >> >>>> >>>
>>> >> ---------------------------------------------------------------------
>>> >> >>>> >>> To unsubscribe, e-mail: [EMAIL PROTECTED]
>>> >> >>>> >>> For additional commands, e-mail: [EMAIL PROTECTED]
>>> >> >>>> >>>
>>> >> >>>> >>>
>>> >> >>>> >>>
>>> >> >>>> >>
>>> >> >>>> >>
>>> >> >>>> >> -----
>>> >> >>>> >> 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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>>> >> >>>> >> For additional commands, e-mail: [EMAIL PROTECTED]
>>> >> >>>> >>
>>> >> >>>> >>
>>> >> >>>> >
>>> >> >>>> >
>>> >> ---------------------------------------------------------------------
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>>> >> >>>> >
>>> >> >>>> >
>>> >> >>>>
>>> >> >>>> ---------------------------------------------------------------------
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>>> >> >>>> For additional commands, e-mail: [EMAIL PROTECTED]
>>> >> >>>>
>>> >> >>>>
>>> >> >>>
>>> >> >>>
>>> >> >>
>>> >> >>
>>> >> >> -----
>>> >> >> 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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>>> >>
>>> >>
>>> >
>>
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>>
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