为什么List视图不重复List 在检票口？

Question

当我调试List说，间接列表没有实例化。但是我觉得它在JPA中变得很懒惰。它不在Listview中呈现，但它应该有节点。我错过了什么吗？

//.....code......
private ListView<String> reqs; // Requirements
private Label lblreqs;  //Label for repeat requirements
//...code...
    final LigaBaseball lbb = LigaBBServ.buscarPorID(Integer
            .parseInt(idLiga)); //Get Baseball league from database

    if (lbb == null || pageParameters == null
            || pageParameters.get("idLiga") == null)
        throw new RestartResponseException(VerLigas.class); //If null redirect.
//...code...

    add(reqs = new ListView<String>("reqs", new ListModel<String>(lbb.getRequisitos()))//LAZYly get List from LigaBaseball(BaseballLeague) {
        @Override
        protected void populateItem(ListItem<String> item) {
        /*When I debug item is null
*/
            item.add(lblreqs = new Label("lblreqs", (item.getModelObject())));
        }
    });

//...code...

Answer 1

嗯...根据你发布的代码创建的这个（相当简约的）UnitTest，确实如此，但也许我错过了这一点......

package net.unbewaff;

public class DemoTestCase {

    private WicketTester tester = new WicketTester();
    private Panel panel = new MyPanel("panel");

    @Test
    public void testIt() {
        tester.startComponentInPage(panel);
        tester.assertComponent("panel", Panel.class);
        tester.assertComponent("panel:reqs", ListView.class);
        tester.assertComponent("panel:reqs:0", ListItem.class);
        tester.assertLabel("panel:reqs:0:lblreqs", "1");
        tester.assertComponent("panel:reqs:1", ListItem.class);
        tester.assertLabel("panel:reqs:1:lblreqs", "2");
        tester.assertComponent("panel:reqs:2", ListItem.class);
        tester.assertLabel("panel:reqs:2:lblreqs", "3");
        tester.assertComponent("panel:reqs:3", ListItem.class);
        tester.assertLabel("panel:reqs:3:lblreqs", "4");
    }

    private final class MyPanel extends Panel {

        private MyPanel(String id) {
            super(id);
        }

        public void onInitialize() {
            ListView<String> reqs;

            final LigaBaseball lbb = new LigaBaseball();

            reqs = new ListView<String>("reqs", new ListModel<String>(lbb.getRequisitos())) {

                protected void populateItem(ListItem<String> item) {
                    item.add(new Label("lblreqs", (item.getModelObject())));
                }
            };

            add(reqs);

            super.onInitialize();
        }
    }

    class LigaBaseball {

        public List<String> getRequisitos() {
            String[] a = { "1", "2", "3", "4" };
            return Arrays.asList(a);
        }
    }
}

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测试集：net.unbewaff.DemoTestCase

测试运行：1，失败：0，错误：0，跳过：0，经过的时间：0.032秒