What is the stacktrace when group is null?
On 29/04/2009, HHB <hubaghd...@yahoo.ca> wrote:
> Hey,
> I'm trying to employ DataTable in our application.
> *************************
> public class SortableContactDataProvider
> extends SortableDataProvider {
>
> @SpringBean
> private Service service;
>
> private Group group;
>
> public SortableContactDataProvider(Group group) {
> if (group == null)
> throw new IllegalStateException("Group is null");
> InjectorHolder.getInjector().inject(this);
> setSort("gsm", true);
> this.group = group;
> }
>
> public Iterator iterator(int first, int max) {
> return service.list(group, first, max,
> getSort().getProperty(),
> getSort().isAscending()).iterator();
> }
>
> public int size() {
> return service.listContactsSize(group);
> }
>
> public IModel model(Object object) {
> Contact contact = (Contact) object;
> return new DomainEntityModel<Contact>
> (Contact.class, contact.getId());
> }
>
> public void setGroup(Group group) {
> if (group == null)
> throw new IllegalStateException("Group is null");
> this.group = group;
> }
>
> }
> *************************
> And I use it this way (inside the panel constructor):
> *************************
> Group group = new Group();group.setId(1L);
> SortableContactDataProvider scdp = new
> SortableContactDataProvider(group);
> scdp.setGroup(group);
> final List<IColumn> columns = new ArrayList<IColumn>();
> columns.add(new PropertyColumn(new Model("GSM"), "gsm", "gsm"));
> AjaxFallbackDefaultDataTable contacts = new
> AjaxFallbackDefaultDataTable("table", columns, scdp, 10);
> final WebMarkupContainer wmc = new WebMarkupContainer("contactsTable");
> wmc.setOutputMarkupId(true);
> wmc.add(contacts);
> add(wmc);
> *************************
> When running the application, I got NullPointerException
> from the method size() of the provider, the group object is null.
> Why the object is null?
> and if it is null, why IllegalStateException is not being thrown?
> I'm using Wicket 1.3.5
> Thanks for help.
>
>
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