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JavaFX异常加载FXML文件(JavaFX exception loading FXML file)

 我一直在研究桌面应用程序，我需要使用JavaFX。 我在使用Scene Builder构建的eclipse上的JavaFX项目中创建了各种FXML文件。 除了这个讨厌的文件（FXMLImgList.fxml）外，我没有任何问题可以加载任何FXML文件。 
 

 主要想法是，当按下按钮时，会出现一个新窗口。 这是我为该按钮的事件处理程序的代码： 
 

@FXML
private void handleOnActionButtonImg(ActionEvent e) throws MalformedURLException, URISyntaxException
{
    FXMLLoader loader = new FXMLLoader(getClass().getResource("/res/FXMLImgList.fxml").toURI().toURL());
    VBox root = null;
    try {
        root = (VBox) loader.load(); // ERROR LOADING HERE
    } catch (IOException e1) {
        e1.printStackTrace();
    }

    ImgListController ilc = loader.getController();
    ilc.init(imgUrl);

    Scene scene = new Scene(root);
    Stage stage = new Stage();
    stage.initModality(Modality.WINDOW_MODAL);
    stage.initOwner((Stage) vBox.getScene().getWindow());
    stage.setScene(scene);
    stage.setResizable(false);
    stage.setTitle("Elegir imagen");
    stage.show();
}

 

 包浏览器中的项目如下所示： 
 

 
 
 https://image.ibb.co/ihGMoS/Capture.png （无法发布图片） 
 

 

 我从try-catch块得到这个异常： 
 

javafx.fxml.LoadException:
/C:/Users/Ximo/Desktop/UNI/2017-2018%20(UPV)/IPC/EclipseWorkspaceIPC/PL03_Ej2/bin/res/FXMLImgList.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.load(FXMLLoader.java:2409)
    at application.VentanaController.handleOnActionButtonImg(VentanaController.java:108)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.reflect.misc.Trampoline.invoke(Unknown Source)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
    at javafx.fxml.FXMLLoader$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:8413)
    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$MouseEventNotification.run(GlassViewEventHandler.java:381)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$353(GlassViewEventHandler.java:417)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
    at com.sun.glass.ui.View.notifyMouse(View.java:937)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalArgumentException: Invalid URL: unknown protocol: c
    at javafx.scene.image.Image.validateUrl(Image.java:1121)
    at javafx.scene.image.Image.<init>(Image.java:659)
    at application.ImgListController.initialize(ImgListController.java:64)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
    ... 61 more
Caused by: java.net.MalformedURLException: unknown protocol: c
    at java.net.URL.<init>(Unknown Source)
    at java.net.URL.<init>(Unknown Source)
    at java.net.URL.<init>(Unknown Source)
    at javafx.scene.image.Image.validateUrl(Image.java:1115)
    ... 64 more
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
    at javafx.fxml.FXMLLoader$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:8413)
    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$MouseEventNotification.run(GlassViewEventHandler.java:381)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$353(GlassViewEventHandler.java:417)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
    at com.sun.glass.ui.View.notifyMouse(View.java:937)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.reflect.misc.Trampoline.invoke(Unknown Source)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
    ... 48 more
Caused by: java.lang.NullPointerException: Root cannot be null
    at javafx.scene.Scene.<init>(Scene.java:336)
    at javafx.scene.Scene.<init>(Scene.java:194)
    at application.VentanaController.handleOnActionButtonImg(VentanaController.java:116)
    ... 58 more

 

 更奇怪的是，其余的FXML文件加载得很好，比如这个： 
 

@FXML
private void handleOnActionButtonMod(ActionEvent event) 
{
    FXMLLoader loader = new FXMLLoader(getClass().getResource("/res/FXMLVentana.fxml"));
    VBox root = null;
    try {
        root = (VBox) loader.load(); // NO ERROR LOADING HERE
    } catch (IOException e) {
        e.printStackTrace();
    }
    VentanaController vac = loader.getController();
    vac.init(observablePersonData, table.getSelectionModel().selectedIndexProperty().getValue());
    Scene scene = new Scene(root);
    Stage stage = new Stage();
    stage.initModality(Modality.WINDOW_MODAL);
    stage.initOwner(this.stage);
    stage.setScene(scene);
    stage.setResizable(false);
    stage.setTitle("Modificar");
    stage.show();
}

 

 这个事件处理程序背后的想法几乎是相同的， 按下按钮 - >窗口打开并工作得很好。 我已经尝试了很多，例如编辑返回的URL，但似乎没有任何工作。 
 

 我已经注意到第67行的消息： 
 

 
 
 引起：java.lang.IllegalArgumentException：无效的URL：未知的协议：c 
 

 

 但是结果如下： 
 

    System.out.println(getClass().getResource("/res/FXMLVentana.fxml"));
    System.out.println(getClass().getResource("/res/FXMLImgList.fxml"));

 

 输出： 
 

 
 
 文件：/ C：/用户/细末/桌面/ UNI / 2017年至2018年20％（UPV）/IPC/EclipseWorkspaceIPC/PL03_Ej2/bin/res/FXMLVentana.fxml 
 
 
 文件：/ C：/用户/细末/桌面/ UNI / 2017年至2018年20％（UPV）/IPC/EclipseWorkspaceIPC/PL03_Ej2/bin/res/FXMLImgList.fxml 
 

 

 以下是FXMLImgList.fxml的代码： 
 

<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>

<VBox fx:id="root" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" spacing="12.0" xmlns="        http://javafx.com/javafx/8.0.151" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.ImgListController">
   <children>
      <HBox alignment="CENTER_RIGHT" spacing="12.0">
         <children>
            <Button fx:id="cancelar" mnemonicParsing="false" onAction="#handleOnActionButtonCancelar" text="Cancelar" />
            <Button fx:id="salvar" mnemonicParsing="false" onAction="#handleOnActionButtonSalvar" text="Salvar" />
         </children>
         <VBox.margin>
            <Insets />
         </VBox.margin>
      </HBox>
   </children>
   <padding>
      <Insets bottom="12.0" left="12.0" right="12.0" top="12.0" />
   </padding>
</VBox>

 

 这里是FXMLVentana.fxml： 
 

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>

<VBox fx:id="vBox" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" spacing="12.0" xmlns="http://javafx.com/javafx/8.0.151" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.VentanaController">
   <children>
      <HBox alignment="CENTER" spacing="30.0">
         <children>
            <Label prefHeight="17.0" prefWidth="53.0" text="DNI" />
            <TextField fx:id="dni" />
         </children>
      </HBox>
      <HBox alignment="CENTER" spacing="30.0">
         <children>
            <Label prefHeight="17.0" prefWidth="53.0" text="Nombre" />
            <TextField fx:id="nombre" />
         </children>
      </HBox>
      <HBox alignment="CENTER" spacing="30.0">
         <children>
            <Label prefHeight="17.0" prefWidth="52.0" text="Apellidos" />
            <TextField fx:id="apellidos" />
         </children>
      </HBox>
      <HBox alignment="CENTER" spacing="30.0">
         <children>
            <Label prefHeight="17.0" prefWidth="52.0" text="Ciudad" />
            <TextField fx:id="city" />
         </children>
      </HBox>
      <HBox alignment="CENTER" spacing="30.0">
         <children>
            <Label prefHeight="17.0" prefWidth="52.0" text="Provincia" />
            <TextField fx:id="province" />
         </children>
      </HBox>
      <HBox alignment="CENTER" spacing="12.0">
         <children>
            <ImageView fx:id="imgView" fitHeight="80.0" fitWidth="80.0" onMouseClicked="#handleImgMouseClick" pickOnBounds="true" preserveRatio    ="true" />
        <Button     fx:id="buttonImg" mnemonicParsing="false" onAction="#handleOnActionButtonImg" text="Imagen" />
     </children    >
  </HBox    >
  <    HBox alignment="CENTER_RIGHT" spacing="12.0">
         <children>
            <Button fx:id="buttonCancelar" mnemonicParsing="false" onAction="#handleOnActionButtonCancelar" text="Cancelar" />
            <Button fx:id="buttonAction" mnemonicParsing="false" onAction="#handleOnActionButtonAction" text="Salvar" />
         </children>
      </HBox>
   </children>
   <padding>
      <Insets bottom="12.0" left="30.0" right="30.0" top="12.0" />
   </padding>
</VBox>

 

 总而言之，我全都没有想法，也没有发现我似乎解决了这个问题。 任何帮助表示赞赏，谢谢！ 

I have been working on a desktop application, where I need to use JavaFX. I have created various FXML files in a JavaFX project on eclipse built with Scene Builder. I have no issues loading any FXML file except for this one pesky file (FXMLImgList.fxml).
 

The main idea is that when a button is pressed, a new window appears. Here is my code for the event handler for that button:
 

@FXML
private void handleOnActionButtonImg(ActionEvent e) throws MalformedURLException, URISyntaxException
{
    FXMLLoader loader = new FXMLLoader(getClass().getResource("/res/FXMLImgList.fxml").toURI().toURL());
    VBox root = null;
    try {
        root = (VBox) loader.load(); // ERROR LOADING HERE
    } catch (IOException e1) {
        e1.printStackTrace();
    }

    ImgListController ilc = loader.getController();
    ilc.init(imgUrl);

    Scene scene = new Scene(root);
    Stage stage = new Stage();
    stage.initModality(Modality.WINDOW_MODAL);
    stage.initOwner((Stage) vBox.getScene().getWindow());
    stage.setScene(scene);
    stage.setResizable(false);
    stage.setTitle("Elegir imagen");
    stage.show();
}

 

The project in the package explorer looks like so:
 

 
 
https://image.ibb.co/ihGMoS/Capture.png (Can't post images)
 

 

I get this exception from the try-catch block:
 

javafx.fxml.LoadException:
/C:/Users/Ximo/Desktop/UNI/2017-2018%20(UPV)/IPC/EclipseWorkspaceIPC/PL03_Ej2/bin/res/FXMLImgList.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.load(FXMLLoader.java:2409)
    at application.VentanaController.handleOnActionButtonImg(VentanaController.java:108)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.reflect.misc.Trampoline.invoke(Unknown Source)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
    at javafx.fxml.FXMLLoader$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:8413)
    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$MouseEventNotification.run(GlassViewEventHandler.java:381)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$353(GlassViewEventHandler.java:417)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
    at com.sun.glass.ui.View.notifyMouse(View.java:937)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalArgumentException: Invalid URL: unknown protocol: c
    at javafx.scene.image.Image.validateUrl(Image.java:1121)
    at javafx.scene.image.Image.<init>(Image.java:659)
    at application.ImgListController.initialize(ImgListController.java:64)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
    ... 61 more
Caused by: java.net.MalformedURLException: unknown protocol: c
    at java.net.URL.<init>(Unknown Source)
    at java.net.URL.<init>(Unknown Source)
    at java.net.URL.<init>(Unknown Source)
    at javafx.scene.image.Image.validateUrl(Image.java:1115)
    ... 64 more
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
    at javafx.fxml.FXMLLoader$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:8413)
    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$MouseEventNotification.run(GlassViewEventHandler.java:381)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$353(GlassViewEventHandler.java:417)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
    at com.sun.glass.ui.View.notifyMouse(View.java:937)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.reflect.misc.Trampoline.invoke(Unknown Source)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
    ... 48 more
Caused by: java.lang.NullPointerException: Root cannot be null
    at javafx.scene.Scene.<init>(Scene.java:336)
    at javafx.scene.Scene.<init>(Scene.java:194)
    at application.VentanaController.handleOnActionButtonImg(VentanaController.java:116)
    ... 58 more

 

What's even stranger, the rest of the FXML files load just fine, for example this one:
 

@FXML
private void handleOnActionButtonMod(ActionEvent event) 
{
    FXMLLoader loader = new FXMLLoader(getClass().getResource("/res/FXMLVentana.fxml"));
    VBox root = null;
    try {
        root = (VBox) loader.load(); // NO ERROR LOADING HERE
    } catch (IOException e) {
        e.printStackTrace();
    }
    VentanaController vac = loader.getController();
    vac.init(observablePersonData, table.getSelectionModel().selectedIndexProperty().getValue());
    Scene scene = new Scene(root);
    Stage stage = new Stage();
    stage.initModality(Modality.WINDOW_MODAL);
    stage.initOwner(this.stage);
    stage.setScene(scene);
    stage.setResizable(false);
    stage.setTitle("Modificar");
    stage.show();
}

 

The idea behind this event handler is pretty much the same, press button -> window opens and works just fine. I've tried many this like editing the returned URL but nothing seems to work.
 

I've notice the message on line 67:
 

 
 
Caused by: java.lang.IllegalArgumentException: Invalid URL: unknown protocol: c
 

 

However the result of:
 

    System.out.println(getClass().getResource("/res/FXMLVentana.fxml"));
    System.out.println(getClass().getResource("/res/FXMLImgList.fxml"));

 

Outputs:
 

 
 
file:/C:/Users/Ximo/Desktop/UNI/2017-2018%20(UPV)/IPC/EclipseWorkspaceIPC/PL03_Ej2/bin/res/FXMLVentana.fxml
 
 
file:/C:/Users/Ximo/Desktop/UNI/2017-2018%20(UPV)/IPC/EclipseWorkspaceIPC/PL03_Ej2/bin/res/FXMLImgList.fxml
 

 

Here's the code for FXMLImgList.fxml: 
 

<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>

<VBox fx:id="root" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" spacing="12.0" xmlns="        http://javafx.com/javafx/8.0.151" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.ImgListController">
   <children>
      <HBox alignment="CENTER_RIGHT" spacing="12.0">
         <children>
            <Button fx:id="cancelar" mnemonicParsing="false" onAction="#handleOnActionButtonCancelar" text="Cancelar" />
            <Button fx:id="salvar" mnemonicParsing="false" onAction="#handleOnActionButtonSalvar" text="Salvar" />
         </children>
         <VBox.margin>
            <Insets />
         </VBox.margin>
      </HBox>
   </children>
   <padding>
      <Insets bottom="12.0" left="12.0" right="12.0" top="12.0" />
   </padding>
</VBox>

 

And here's FXMLVentana.fxml:
 

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>

<VBox fx:id="vBox" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" spacing="12.0" xmlns="http://javafx.com/javafx/8.0.151" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.VentanaController">
   <children>
      <HBox alignment="CENTER" spacing="30.0">
         <children>
            <Label prefHeight="17.0" prefWidth="53.0" text="DNI" />
            <TextField fx:id="dni" />
         </children>
      </HBox>
      <HBox alignment="CENTER" spacing="30.0">
         <children>
            <Label prefHeight="17.0" prefWidth="53.0" text="Nombre" />
            <TextField fx:id="nombre" />
         </children>
      </HBox>
      <HBox alignment="CENTER" spacing="30.0">
         <children>
            <Label prefHeight="17.0" prefWidth="52.0" text="Apellidos" />
            <TextField fx:id="apellidos" />
         </children>
      </HBox>
      <HBox alignment="CENTER" spacing="30.0">
         <children>
            <Label prefHeight="17.0" prefWidth="52.0" text="Ciudad" />
            <TextField fx:id="city" />
         </children>
      </HBox>
      <HBox alignment="CENTER" spacing="30.0">
         <children>
            <Label prefHeight="17.0" prefWidth="52.0" text="Provincia" />
            <TextField fx:id="province" />
         </children>
      </HBox>
      <HBox alignment="CENTER" spacing="12.0">
         <children>
            <ImageView fx:id="imgView" fitHeight="80.0" fitWidth="80.0" onMouseClicked="#handleImgMouseClick" pickOnBounds="true" preserveRatio    ="true" />
        <Button     fx:id="buttonImg" mnemonicParsing="false" onAction="#handleOnActionButtonImg" text="Imagen" />
     </children    >
  </HBox    >
  <    HBox alignment="CENTER_RIGHT" spacing="12.0">
         <children>
            <Button fx:id="buttonCancelar" mnemonicParsing="false" onAction="#handleOnActionButtonCancelar" text="Cancelar" />
            <Button fx:id="buttonAction" mnemonicParsing="false" onAction="#handleOnActionButtonAction" text="Salvar" />
         </children>
      </HBox>
   </children>
   <padding>
      <Insets bottom="12.0" left="30.0" right="30.0" top="12.0" />
   </padding>
</VBox>

 

In conclusion, I'm all out of ideas and nothing I find onlince seems to solve the issue. Any help is appreciated, thanks!

原文：https://stackoverflow.com/questions/49141021
更新时间：2023-05-18 19:05

最满意答案

 前两个示例表示strings ，最后一个示例表示JSON上a boolean值（ http://www.json.org/ ） 
 

 从规格： 
 

 值可以是string in double quotes的string in double quotes number ，或true或false或null ，或an object或an array 。 这些结构可以嵌套 
 

 如果你真的想要a boolean那么使用最后一个例子。 
 

 JSON:API没有说明任何内容，因为规范本身是在JSON之上（继承所有JSON规范） 

The first two examples represent strings and the last example represents a boolean value on JSON (http://www.json.org/)
 

From the spec:
 

A value can be a string in double quotes, or a number, or true or false or null, or an object or an array. These structures can be nested.`
 

If you really want a boolean then use the last example.
 

JSON:API do not say anything about it because, the specification itself is on top of JSON (inherit all the JSON specification)

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