org.hibernate.NonUniqueObjectException is a really common problem. My
guess is that the DataStoreUser is being loaded once to pass it into
the page constructor and again by the LoadableDetachableModel within
the same Hibernate session. Same persistent object loaded into two
separate instance variables in the same (Hibernate) session -- boom,
NonUniqueObjectException.
There are a couple of ways to fix this. The "correct" solution is to
avoid loading the object more than once in the first place. For
instance, maybe you could take a user id instead of a user object
into your page constructor to remove one of the load operations. The
standard solution is to use Session.merge() instead of, say,
Session.saveOrUpdate() (I assume you're getting this exception when
the Hibernate session flushes).
In any event, this is happening because LoadableDetachableModel is
working as intended and thereby revealing one of Hibernate's many
"quirks" -- not because of a problem in Wicket.
-Ryan
On Feb 10, 2007, at 2:31 AM, Matthew Kwong wrote:
>
> Hi fellows,
>
> Last time I asked how to use chain in CompoundPropertyModel with
> LoadableDetachableModel, it worked since my page has no form (no
> submit).
> This time, I make another page and try to use the chain again, and
> hibernate
> throws org.hibernate.NonUniqueObjectException when I submit the form.
>
> Caused by: org.hibernate.NonUniqueObjectException: a different
> object with
> the same identifier value was already associated with the session:
> [datastore2.model.DataStoreRole#1]
>
> My Panel:
>
> public UserDetail(String id, DataStoreUser user, final Panel
> prevPanel) {
> super(id);
> add(new FeedbackPanel("feedback"));
>
> add(new Link("back") {
> public void onClick() {
> getParent().replaceWith(prevPanel);
> }
> });
>
> Form form = new Form("form") {
> protected void onSubmit() {
> DataStoreUser user = (DataStoreUser)
> this.getModelObject();
> try {
> getDelegate().saveUser(user);
> info("You have saved the user profile: " +
> user.getFullname() + ".");
> } catch (Exception e) {
> e.printStackTrace();
> error("Your user profile state is stale
> (someone has
> updated the same user profile while you are on this page). Please
> press BACK
> and come back.");
> }
> }
> };
>
> form.setModel(new CompoundPropertyModel(new
> LoadableDataStoreUserModel(getDelegate().getDataStoreUser(user.getId
> ()))));
> form.add(new Label("id"));
> form.add(new Label("username"));
> form.add(new RequiredTextField("firstname"));
> form.add(new
> TextField("lastname").setConvertEmptyInputStringToNull(false));
> form.add(new Label("email"));
> form.add(new Palette("roles", new
> Model((Serializable)getDelegate().getDataStoreRoles()), new
> RoleChoiceRenderer(), 10, true));
> add(form);
> }
>
> Is LoadableDetachableModel working for form processing? Because it is
> working if I only have
> form.setModel(new
> CompoundPropertyModel(getDelegate().getDataStoreUser(user.getId())));
>
> The reason why i want this loadable since I want to update the page
> with
> "F5" refresh button again if someone has changed the same user in
> another
> computer.
>
> Thank you :)
> Matthew Kwong
> --
> View this message in context: http://www.nabble.com/
> LoadableDetachableModel-in-form-processing-tf3204839.html#a8899449
> Sent from the Wicket - User mailing list archive at Nabble.com.
>
>
> ----------------------------------------------------------------------
> ---
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> security?
> Get stuff done quickly with pre-integrated technology to make your
> job easier.
> Download IBM WebSphere Application Server v.1.0.1 based on Apache
> Geronimo
> http://sel.as-us.falkag.net/sel?
> cmd=lnk&kid=120709&bid=263057&dat=121642
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