public class LazyLoad extends WebPage {

    public LazyLoad() {
            IColumn[] columns = new IColumn[] {
                            new PropertyColumn(new Model("col1"), "intValue"),
                            new PropertyColumn(new Model("col2"), "class") };
            ISortableDataProvider dataProvider = new SortableDataProvider() {

                    public int size() {
                            return 300000;
                    }

                    public IModel model(Object object) {
                            return new Model((Integer) object);
                    }

                    public Iterator iterator(int first, int count) {
                            return loadEntriesFromDatabase(first, count).iterator();
                    }

                    private List<Integer> loadEntriesFromDatabase(int first, int count) {
                            List<Integer> items = new ArrayList<Integer>();
                            for (int i = 0; i < count; i++) {
                                    items.add(new Integer(first + i));
                            }
                            return items;
                    }

            };
            DefaultDataTable t = new DefaultDataTable("t", columns, dataProvider, 3);
            add(t);
    }

}