[CLOSED] AggregationRowConfig with RPC return null pointer

[fother]

set the class Customer to

public class Customer implements BeanModelTag, Serializable {

change the code in BeanModelGridExample to

public class BeanModelGridExample extends LayoutContainer {

	@Override
	protected void onRender(Element parent, int index) {
		super.onRender(parent, index);
		setStyleAttribute("padding", "20px");

		GridCellRenderer<BeanModel> render = new GridCellRenderer<BeanModel>() {

			public Object render(BeanModel model, String property, ColumnData config, int rowIndex, int colIndex, ListStore<BeanModel> store,
					Grid<BeanModel> grid) {
				return "test " + model.get("age");
			}

		};

		// gwt service
		final ExampleServiceAsync service = (ExampleServiceAsync) Registry.get(Examples.SERVICE);

		// proxy and reader
		RpcProxy<List<Customer>> proxy = new RpcProxy<List<Customer>>() {
			@Override
			public void load(Object loadConfig, AsyncCallback<List<Customer>> callback) {
				service.getCustomers(callback);
			}
		};
		BeanModelReader reader = new BeanModelReader();

		// loader and store
		ListLoader<ListLoadResult<ModelData>> loader = new BaseListLoader<ListLoadResult<ModelData>>(proxy, reader);
		ListStore<BeanModel> store = new ListStore<BeanModel>(loader);

		loader.load();

		// column model
		List<ColumnConfig> columns = new ArrayList<ColumnConfig>();
		columns.add(new ColumnConfig("name", "Name", 200));
		columns.add(new ColumnConfig("email", "Email", 100));

		ColumnConfig age = new ColumnConfig("age", "Age", 50);
		age.setRenderer(render);

		columns.add(age);

		AggregationRowConfig<BeanModel> totals = new AggregationRowConfig<BeanModel>();

		totals.setSummaryType("age", SummaryType.AVG);
		totals.setRenderer("age", new AggregationRenderer<BeanModel>() {

			public Object render(Number value, int colIndex, Grid<BeanModel> grid, ListStore<BeanModel> store) {
				return NumberFormat.getCurrencyFormat().format(value.doubleValue());
			}
		});

		ColumnModel cm = new ColumnModel(columns);
		cm.addAggregationRow(totals);

		Grid<BeanModel> grid = new Grid<BeanModel>(store, cm);
		grid.setAutoExpandColumn("name");
		grid.setSize(400, 200);

		add(grid);
	}

on method getCustomers() of the class ExampleServiceImpl, add one break point in

return customers;

DEBUG the GXT explorer demo application and click to see the BeanModelGrid example.. you will see that the grid will render.. and return a null pointer exception.. so.. click in button Resume(F8) the data will render and the aggregation row will appears correctely..

Real situation.. when call a remote procedure.. can be a complex calc and delay more than the normal..

I believe that the behavior of the aggregation row should be like GridCellRenderer

[fother]

in ColumnFooter you need verify in the line 228

add this condition

if (value != null) {
  Object obj = renderer.render(value, j, (Grid) grid, (ListStore) store);
}

[fother]

other real situation.. the RPC need access other database.. that delay more than normal..

[sven]

The issue is in your renderer and not GXT. I close this issue.

[fother]

no!

to solve this I always need add this condition in my code..

		totals.setRenderer("age", new AggregationRenderer<BeanModel>() {

			public Object render(Number value, int colIndex, Grid<BeanModel> grid, ListStore<BeanModel> store) {
				
				if (value != null) {
					return NumberFormat.getCurrencyFormat().format(value.doubleValue());
				} else {
					return "";
				}
			}
		});

[sven]

yes and that is correct. If value is null you cant call doubleValue on it.

[fother]

yes I know about this

the problem that this method is called twice.. when the grid is render.. that the value is null and when the data its load.. I believe that if the value is null, cannot call the method render.. because in all situation will return null pointer..

[sven]

Also that is correct. The footer should also be displayed with 0 records in the grid.

[fother]

I agree with you.. but only the html and widget can be render when have 0 records..

the method render no can.. because what the value for average sum and other when dont have records?

[sven]

That is why you define a renderer. So you can say what should be displayed in that case.