ポップアップウィンドウがListViewと衝突するのはなぜですか？

Question

ちょっとこれは私が学校のために書いているプログラムの一部で、ポップアップウィンドウの "event addCustomer"が次の行と衝突します： customersList.setItems（oList）;

メソッドのsetListView（）の下部に？ アイデア？ 残りのプログラムが必要な場合は、リクエストに応じて投稿することができます！

ありがとうございました！

public class FXMLDocumentController implements Initializable { 

    private BankLogic b; 

    private ObservableList<String> oList; 

    @FXML 
    private ListView customersList; 

    @FXML 
    private Button addCustomerButton, deleteCustomerButton; 

    @FXML 
    private Button confirmPop1, cancelPop1, confirmPop2, cancelPop2; 


    @FXML 
    private void addCustomer(ActionEvent event) throws IOException { 

     Stage stage; 
     Parent root; 

     stage = new Stage(); 
     root = FXMLLoader.load(getClass().getResource("FXMLpopUp1.fxml")); 
     stage.setScene(new Scene(root)); 
     stage.initModality(Modality.APPLICATION_MODAL); 
     stage.initOwner(addCustomerButton.getScene().getWindow()); 
     stage.showAndWait(); 
    } // opens a confirm window with 2 buttons: 

    @FXML 
    private void confirmPop1(ActionEvent event) { 

     Stage stg = (Stage) ((Node) event.getSource()).getScene().getWindow(); 
     stg.close(); 

    } 

    @FXML 
    private void cancelPop1(ActionEvent event) { 

     Stage stg = (Stage) ((Node) event.getSource()).getScene().getWindow(); 
     stg.close(); 

    } 

    @Override 
    public void initialize(URL url, ResourceBundle rb) { 
     b = BankLogic.getInstance(); 


     long nr = 198905643943L; 
     b.addCustomer("Kalle karlsson", nr); 
     nr = 198905643843L; 
     b.addCustomer("Peter haraldsson", nr); 
     nr = 198967643943L; 
     b.addCustomer("Hans haraldsson", nr); 
     nr = 198905643978L; 
     b.addCustomer("Harry haraldsson", nr); 
     // 4 objects of a class called Customer! 

     setListView(); // calling method to fill ListView 

    } 

    public void setListView() { 
     oList = FXCollections.observableArrayList(); 

     ArrayList<Customer> tC = b.getCustomerList(); 
     for (Customer c : tC) { 
      String s = c.getName() + " " + c.getPnr(); 
      oList.add(s); 
     } 

     customersList.setItems(oList); // This line collides with my popup window and givs me an exception. 
    } 

} 

例外：

Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException 
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774) 
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657) 
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86) 
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238) 
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191) 
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74) 
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49) 
at javafx.event.Event.fireEvent(Event.java:198) 
at javafx.scene.Node.fireEvent(Node.java:8411) 
at javafx.scene.control.Button.fire(Button.java:185) 
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182) 
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96) 
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89) 
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218) 
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80) 
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238) 
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191) 
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74) 
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54) 
at javafx.event.Event.fireEvent(Event.java:198) 
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757) 
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485) 
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762) 
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494) 
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:352) 
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:275) 
at java.security.AccessController.doPrivileged(Native Method) 
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:388) 
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389) 
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:387) 
at com.sun.glass.ui.View.handleMouseEvent(View.java:555) 
at com.sun.glass.ui.View.notifyMouse(View.java:937) 

Caused by: java.lang.reflect.InvocationTargetException 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:497) 
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71) 
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:497) 
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275) 
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769) 
... 45 more 
Caused by: javafx.fxml.LoadException: file:/NetBeansProjects/Grupp1-Bank/dist/run1287972729/BankSystem.jar!/banksystem/FXMLpopUp1.fxml 

at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2579) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104) 
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097) 
at banksystem.FXMLDocumentController.addCustomer(FXMLDocumentController.java:86) 
... 55 more 
Caused by: java.lang.NullPointerException 
at banksystem.FXMLDocumentController.setListView(FXMLDocumentController.java:193) 
at banksystem.FXMLDocumentController.initialize(FXMLDocumentController.java:180) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548) 
... 63 more 

Answer 1

次の2つの異なるFXMLファイルをロードしている、その結果、二つの異なるコントローラが自動的に作成されます。両方のコントローラーが同じクラスのものになるように設定したスタックトレースから表示されます。

FXMLLoaderがFXMLファイルをロードし、コントローラのインスタンスを作成し、それはfx:id属性が一致するFXMLファイル内の要素と@FXMLを注釈付きフィールドを注入し、その後initialize()メソッドを呼び出します。

FXMLpopUp1.fxmlにはfx:id="customersList"の要素が含まれていないようですので、customersListはそのコントローラにnullのままです。したがって、initialize()メソッドがsetListView()を呼び出すと、NULLポインタ例外が発生します。

FXMLファイルごとに異なるコントローラクラスを使用する必要があります。 FXMLpopUp1.fxmlためのコントローラクラスは

public class PopupController { 

    @FXML 
    private Button confirmPop ; 

    private boolean confirmed = false ; 

    public void isConfirmed() { 
     return confirmed ; 
    } 

    @FXML 
    private void confirmPop() { 
     confirmed = true ; 
     confirmPop.getScene().getWindow().hide(); 
    } 

    @FXML 
    private void cancelPop() { 
     confirmed = false ; 
     confirmPop.getScene().getWindow().hide(); 
    } 
} 

ようになりますし、その後、あなたの「メイン」コントローラで使用すると、スタックトレースから

@FXML 
private void addCustomer(ActionEvent event) throws IOException { 

    Stage stage; 
    Parent root; 

    stage = new Stage(); 
    FXMLLoader loader = new FXMLLoader(getClass().getResource("FXMLpopUp1.fxml")); 
    root = loader.load(); 
    PopupController popupController = loader.getController(); 
    stage.setScene(new Scene(root)); 
    stage.initModality(Modality.APPLICATION_MODAL); 
    stage.initOwner(addCustomerButton.getScene().getWindow()); 
    stage.showAndWait(); 
    if (popupController.isConfirmed()) { 
     // confirm button was pressed... 
    } 
}