如何在运行时引导FXML文件？

Question

我有一个用TitledPanes动态填充的Accordion窗格。每个TitlePane都需要保存一个子AnchorPane，它将显示该对象的相关信息。子项AnchorPane保存在单独的FXML文件中，需要在TitledPane扩展时加载。

这是我正在尝试使用的控制器：

public class PeopleViewController {

DataSource data;

@FXML
private Accordion accordion;
@FXML
private AnchorPane detailAnchor;
@FXML
private TableView<HashMap<String, String>> dataTable;
@FXML
private TableColumn<HashMap<String, String>,String> propertyiesColumn;
@FXML
private TableColumn<HashMap<String, String>,String> detailsColumn;

public ScheduleViewController(){
    data = new DataSource();
}


@FXML
private void initialize() {
    ObservableList<String> nameList = FXCollections.observableArrayList(dataSource.getNames()); 
    for(String name:nameList){
        accordion.getPanes().add(buildTitledPane(name));
    }
    accordion.setVisible(true);
}

private TitledPane buildTitledPane(final String text){
    final TitledPane tp = new TitledPane();
    tp.setText(text);
    tp.expandedProperty().addListener(new ChangeListener<Boolean>() {
        @Override
        public void changed(
                ObservableValue<? extends Boolean> observable,
                Boolean oldValue, Boolean newValue) {
            if(tp.isExpanded()){
            getPersonData(tp);
            }
        }
    });
    return tp;
}


@FXML
private void getPersonData(TitledPane tp){
    try {
        detailAnchor = FXMLLoader.load(getClass().getResource("PersonDetail.fxml"));
    } catch (IOException e) {
        e.printStackTrace();
    }
    //Will add data to the table here
    tp.setContent(detailAnchor);
}

但是getPersonData（）会抛出java.lang.reflect.InvocationTargetException ...引起：java.lang.NullPointerException。我显然没有正确加载文件。我做错了什么？