Take a look at the examples projects too. The phonebook example should
be very usefull to give you an idea how to use typical database driven
applications.
Eelco
On 2/10/06, VGJ <[EMAIL PROTECTED]> wrote:
> I'll try it...not being a Swing programmer and never really having to think
> about how this type of event model works...I had no idea I could do it that
> way.
>
> Thanks very much for the info! I'll see what happens once I get it working.
>
>
> On 2/10/06, Johan Compagner <[EMAIL PROTECTED]> wrote:
> > that looks like very wrong code
> > Don't know where these pieces of code are in:
> >
> > //get default directory
> > Directory ed =
> DirectoryProxy.getDefaultWithEmployees();
> >
> > //get employees from directory
> > List<Employee> employees = ed.getEmployees();
> >
> > but if that is in a webpage constructor or something that it is really
> wrong.
> > Because youre list never changes?
> >
> > Why do you need to split that list?
> >
> > But can't you do something like this:
> >
> > IModel loadingModel = new LoadableDetachableModel()
> > {
> > protected Object load()
> > {
> > //get default directory
> > Directory ed =
> DirectoryProxy.getDefaultWithEmployees();
> >
> > //get employees from directory
> > List<Employee> employees = ed.getEmployees();
> > }
> > };
> >
> > Model modelFirstHalf = new Model(loadingModel)
> > {
> > public Object getObject(final Component component)
> > {
> > // get the loading model
> > Model model = super.getObject(component);
> > List<Employee> employees = model.getObject(null);
> > List<Employee> empList1 = employees.subList(0,
> employees.size()/2);
> > return empList1;
> > }
> >
> > detach()
> > {
> > Model model = super.getObject(component);
> > model.detach();
> > }
> > }
> >
> > and then a second half model also giving that loadingModel.
> >
> > This is just a quick sample. Just give the 2 models a shared object that
> loads the employees once and detached it when
> > the "real" models are detached.
> >
> > johan
> >
> >
> >
> >
> >
> > On 2/11/06, VGJ <[EMAIL PROTECTED]> wrote:
> > > This might put me in a bind then.
> > >
> > > What I showed you before was really a simplified, edited version of the
> code I'm really using.
> > >
> > > What I've got is similar only I have to split that single List into two
> other lists...doing something like this:
> > >
> > > //get default directory
> > > Directory ed =
> DirectoryProxy.getDefaultWithEmployees();
> > >
> > > //get employees from directory
> > > List<Employee> employees = ed.getEmployees ();
> > >
> > > //get full size of employee collection
> > > int listSize = employees.size();
> > > int breakPt = listSize / 2; //...divide in two
> > >
> > > IModel empModel1 = new LoadableDetachableModel()
> > > {
> > > protected Object load()
> > > {
> > > //list 1
> > > List<Employee> empList1 = employees.subList(0, breakPt);
> > >
> > > return empList1;
> > > }
> > > };
> > >
> > > IModel empModel2 = new LoadableDetachableModel()
> > > {
> > > protected Object load()
> > > {
> > > //list 2
> > > List<Employee> empList2 = employees.subList(breakPt,
> listSize);
> > >
> > > return empList2;
> > > }
> > > };
> > >
> > > ...you can probably see my dilemma...to do what I'm doing, I'd have to
> place all of the "global" code inside of each inner-class because I can't
> access it - and that would be unacceptable since I'd have to make another
> round-trip to the database to get the same exact data twice. I know this
> isn't typical but obviously, we all don't write typical code all of the
> time. In this case I'm forced to display the list on the page in two even
> columns side-by-side.
> > >
> > > Any suggestions?
> > >
> > >
> > >
> > > On 2/10/06, Igor Vaynberg < [EMAIL PROTECTED]> wrote:
> > > > if you think that is ugly, maybe wicket is not for you :)
> > > >
> > > > in wicket you use anonymous classes often. an alternative would be to
> make that anonymous class into a private static class, or if it is reusable
> make it a public static class.
> > > >
> > > > unlike many other web frameworks out there wicket requires you to use
> the full facilities of OO in java, so if you want to use wicket you might as
> well learn those.
> > > >
> > > > the loadable model is a good pracice anyways, because it does not
> store your list in session which it would've been given your original code.
> storing that list in session is a waste of space.
> > > >
> > > > i think the problem is that the list that is returned is not
> serializable and so it cannot be stored in session. that is a hibernate
> specific detail. what you can do is copy that list into an array list, but
> that is not a good solution imho, the loadable detachable model is.
> > > >
> > > >
> > > > -Igor
> > > >
> > > >
> > > >
> > > > On 2/10/06, VGJ < [EMAIL PROTECTED]> wrote:
> > > > > Phew, that could get ugly. Could I fix this by making my domain
> classes serializable? Bare with me, I'm still pretty new to Java as well as
> Wicket :)
> > > > >
> > > > >
> > > > >
> > > > > On 2/10/06, Igor Vaynberg <[EMAIL PROTECTED]> wrote:
> > > > > > and if it is, looks like whatever list is returned is not
> serializable so wicket cannot wrap it with a model for you.
> > > > > >
> > > > > > here is how to fix that and make the model detacahable, which is
> good anyways:
> > > > > >
> > > > > >
> > > > > > IModel listModel=new LoadableDetachableModel() {
> > > > > > Object load() {
> > > > > > //get default directory
> > > > > > Directory ed =
> DirectoryProxy.getDefaultWithEmployees();
> > > > > >
> > > > > >
> > > > > > //get employees from directory
> > > > > > return ed.getEmployees();
> > > > > > }
> > > > > > }
> > > > > >
> > > > > > add(new ListView("emoloyees", listModel)...
> > > > > >
> > > > > >
> > > > > > -Igor
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > On 2/10/06, Igor Vaynberg <[EMAIL PROTECTED]> wrote:
> > > > > > > is that the root cause of the exception?
> > > > > > >
> > > > > > > -Igor
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > On 2/10/06, VGJ < [EMAIL PROTECTED]> wrote:
> > > > > > > > I'm trying to convert a single page of an existing application
> using Wicket...just to see how it works. The entire app was built on JDK
> 5.0. It uses hibernate and retrieves lists of data with generics...and it
> may be what is causing my problems since I've spotted a comment here and
> there that Wicket doesn't support Java 5?
> > > > > > > >
> > > > > > > > It's a simple test...I've got my 3 files:
> > > > > > > >
> > > > > > > > CheckIn.html
> > > > > > > > CheckIn.java
> > > > > > > > CheckInApp.java
> > > > > > > >
> > > > > > > > Here's where I'm pulling a List from a proxy class in the
> middle-layer of the application and trying to display it:
> > > > > > > >
> > > > > > > > public class CheckIn extends WebPage
> > > > > > > > {
> > > > > > > > public CheckIn()
> > > > > > > > {
> > > > > > > > //get default directory
> > > > > > > > Directory ed =
> DirectoryProxy.getDefaultWithEmployees();
> > > > > > > >
> > > > > > > > //get employees from directory
> > > > > > > > List<Employee> employees = ed.getEmployees();
> > > > > > > >
> > > > > > > > //list 1
> > > > > > > > add(new ListView("employees", empList)
> > > > > > > > {
> > > > > > > > // This method is called for each 'entry' in the
> list.
> > > > > > > > protected void populateItem(ListItem item)
> > > > > > > > {
> > > > > > > > //get employee object
> > > > > > > > Employee employee =
> (Employee)item.getModelObject();
> > > > > > > >
> > > > > > > > //other employee labels
> > > > > > > > item.add(new Label("firstName",
> employee.getFirstName()));
> > > > > > > > item.add(new Label("lastName",
> employee.getLastName()));
> > > > > > > > }
> > > > > > > > });
> > > > > > > > }
> > > > > > > > }
> > > > > > > >
> > > > > > > > Here's part of the exception I'm getting:
> > > > > > > >
> > > > > > > > ...
> > > > > > > > 14:25:09,613 ERROR RequestCycle:785 - Unexpected runtime
> exception [page = null]
> > > > > > > > java.lang.ClassCastException: java.util.RandomAccessSubList
> > > > > > > > at
> wicket.markup.html.list.ListView.<init>(ListView.java:135)
> > > > > > > > at com.portlets.ui.CheckIn$1.<init>(CheckIn.java:58)
> > > > > > > > at com.portlets.ui.CheckIn.<init>(CheckIn.java:55)
> > > > > > > >
> > > > > > > > Any ideas? Thanks!
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
>
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