Question

我是java的初学者，所以需要帮助。

我有一个适用于Apache POI的javafx应用程序（适用于Excel文件）。当我单击menubutton时，我在Controller类中有一个Error，它应该在Map集合中加载Excel数据，然后显示新的Stage窗口。

但是我有一个奇怪的错误＆＃34;不在FX应用程序线程上; currentThread = JavaFX应用程序线程＆＃34;按下按钮时。这是输出窗口中的红色按钮列表，其中包含以下主要标题：

线程中的异常＆＃34; JavaFX应用程序线程＆＃34; 了java.lang.RuntimeException： java.lang.reflect.InvocationTargetException
- 引起：java.lang.reflect.InvocationTargetException
- 引起：java.lang.IllegalStateException：不在FX应用程序线程上; currentThread = JavaFX应用程序线程

以下是Controller in Controller

的代码

public void SKULoading(ActionEvent ae) {
            Stage stage = (Stage) menuBar.getScene().getWindow();
            stage.hide();

            XSSFWorkbook wb = ExcelModel.OpenFile(stage); //using Filechooser
            ExcelModel book = new ExcelModel(wb);
            Map<Integer, List<String>> data = book.SheetToArray(0);
            book.WBclose();

            Stage primarystage;
            // Since that moment error occurs!
            primarystage = new Stage();
            FXMLLoader loader = new FXMLLoader();
            Pane root = null;
            try {
                root = loader.load(getClass().getResource("/FProject/SKUmanager.fxml").openStream());
            } catch (IOException ex) {
                Logger.getLogger(MainWindowController.class.getName()).log(Level.SEVERE, null, ex);
            }
            Scene scene = new Scene(root);
            primarystage.setScene(scene);
            primarystage.show();
}

我看到了这个话题How to avoid Not on FX application thread; currentThread = JavaFX Application Thread error?，但解决方案就像＆＃34; Platform.runLater（new Runnable（）{}）;＆＃34;如果我几乎包含在Method中的所有代码中，似乎解决了这个问题。但我不确定这是不是正确的决定，因为我之前没有创建任何新线程。

当我删除了行stage.hide();时，显示了新的舞台

或当我离开行stage.hide();并删除行

时

    XSSFWorkbook wb = ExcelModel.OpenFile(stage);
    ExcelModel book = new ExcelModel(wb);
    Map<Integer, List<String>> data = book.SheetToArray(0);
    book.WBclose();

再次显示舞台。

当我替换代码时

FileChooser fileChooser = new FileChooser();
fileChooser.setTitle("Open Resource File");
File file = fileChooser.showOpenDialog(stage);

ExcelModel.OpenFile(stage);

File file = new File("C:\\Users\\Maks\\Desktop\\Test.xlsx");

舞台也被展示了。

所以，我认为，答案是靠近创建/隐藏阶段或使用FileChooser （看起来像使用Filechooser以某种方式影响新舞台隐藏后的新舞台的外观）

UPD

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.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    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.control.MenuItem.fire(MenuItem.java:462)
    at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer.doSelect(ContextMenuContent.java:1405)
    at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer.lambda$createChildren$343(ContextMenuContent.java:1358)
    at com.sun.javafx.event.CompositeEventHandler$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.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$354(GlassViewEventHandler.java:388)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:387)
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
    at com.sun.glass.ui.View.notifyMouse(View.java:937)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
    ... 43 more
Caused by: java.lang.IllegalStateException: Not on FX application thread; currentThread = JavaFX Application Thread
    at com.sun.javafx.tk.Toolkit.checkFxUserThread(Toolkit.java:236)
    at com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(QuantumToolkit.java:423)
    at javafx.stage.Stage.<init>(Stage.java:241)
    at javafx.stage.Stage.<init>(Stage.java:227)
    at FProject.MainWindowController.SKULoading(MainWindowController.java:124)
    ... 53 more

帮助我找出问题的根源，以避免将来出现此类错误。谢谢！

＆＃34;不在FX应用程序线程上; currentThread = JavaFX应用程序线程＆＃34;和＆＃34; InvocationTargetException＆＃34;

0 个答案: