The closing of the session is not so much of a problem. The problem is
that those objects themselve hold references to the session when they
have lazy collections (which is the default in Hibernate 3+). And that
session is stale after the request (as you close the session).
I'm not sure whether this is relevant anymore for the latests
Hibernate versions... maybe it got smarter about where it gets the
session from. You might check this, and maybe ask around on ##wicket
at irc.freenode.net.
Eelco
On 2/10/06, VGJ <[EMAIL PROTECTED]> wrote:
> I am keeping references of the objects though...as I am passing the objects
> around, not just references to some of the properties of the object(s).
>
> As I understand it, however, closing the Session in a Filter will ensure
> that the session gets closed at the proper time and I should not have a
> problem? I haven't actually test my app much yet...I'll have to play around
> w/ it.
>
> Would using a ContextListener to manage my sessions be more safe in the
> context of use w/ Wicket?
>
>
> On 2/10/06, Eelco Hillenius < [EMAIL PROTECTED]> wrote:
> >
> > Yeah, even though there are this disadvantages, it is a really good
> > idea to use detachable models when you work with Hibernate. Or unproxy
> > your objects before you keep them as state.
> >
> > In fact, the example that you gave would be fine, as you are not
> > holding the actual hibernate object, but just get a few strings out of
> > it. As long as you don't keep references to your Hibernate objects
> > (either by putting them in models, or keeping them as properties of
> > your components), you'll be fine.
> >
> >
> > Eelco
> >
> >
> > On 2/10/06, VGJ < [EMAIL PROTECTED]> wrote:
> > > Ugh...not sure I like that solution...you described exactly why too.
> > >
> > > I'm using Hibernate and I'm opening my sessions in my DAO layer and
> closing
> > > them w/ a Filter...will this still affect me (i.e. stale sessions)?? I
> just
> > > started using Wicket yesterday so I'm a poppin-fresh newbie.
> > >
> > > On 2/10/06, Eelco Hillenius < [EMAIL PROTECTED]> wrote:
> > > >
> > > > Yep, that's it. Instead of passing your domain object directly, you
> > > > might consider putting it behind a IModel instance:
> > > >
> > > > public class HeaderPanel extends Panel
> > > > {
> > > > public HeaderPanel(String id, IModel blog)
> > > > {
> > > > super(id);
> > > >
> > > > add(new Label("name", new PropertyModel(blog, "name"));
> > > > add(new Label("synopsis", new PropertyModel(blog,
> > > "synopsis"));
> > > > }
> > > > }
> > > >
> > > > or
> > > >
> > > > public class HeaderPanel extends Panel
> > > > {
> > > > public HeaderPanel(String id, IModel blog)
> > > > {
> > > > super(id, new CompoundPropertyModel(blog));
> > > >
> > > > add(new Label("name"));
> > > > add(new Label("synopsis"));
> > > > }
> > > > }
> > > >
> > > > Pro for using IModel instead of domain object: you can later decide to
> > > > use detachable models, which is usually a good idea when you use
> > > > Hibernate (otherwise you'll end up with stale Session references in
> > > > your objects) and which will use less session memory.
> > > >
> > > > Con: it's more work, makes the code harder to follow, you have to do
> > > > refactorings of properties by hand and less efficient if memory is not
> > > > a problem.
> > > >
> > > > Oooh, I whish we could use generics for the core project so that the
> > > > first few cons were eliminated.
> > > >
> > > > Eelco
> > > >
> > > >
> > > > On 2/10/06, V. Jenks <[EMAIL PROTECTED] > wrote:
> > > > > I'm having a little trouble understanding how to use Panels
> correctly.
> > > > >
> > > > > I'm trying to convert a JSP that has many JSP 2.0 tagfile "includes"
> of
> > > > > which I pass objects into so they can display some of the data that
> the
> > > > > "master" JSP tag displays.
> > > > >
> > > > > In Wicket, I've re-created the tagfiles as Panels and I'm trying to
> pass
> > > > > data to them from the "master" page class through the Panels'
> > > > > constructors..like so:
> > > > >
> > > > > public class HeaderPanel extends Panel
> > > > > {
> > > > > public HeaderPanel(String id, Blog blog)
> > > > > {
> > > > > super(id);
> > > > >
> > > > > add(new Label("name", blog.getName()));
> > > > > add(new Label("synopsis", blog.getSynopsis()));
> > > > > }
> > > > > }
> > > > >
> > > > > I'm guessing that this is the way to do this as I haven't been able
> to
> > > > > find any examples stating otherwise.
> > > > >
> > > > > Am I on the right track? Maybe the wiki could use a JSP-to-Wicket
> > > > > upgrade path type of document?
> > > > >
> > > > > Thanks!
> > > > >
> > > > >
> > > > >
> > > > >
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