JavaFX异常加载FXML文件
JavaFX exception loading FXML file
我一直在开发桌面应用程序，我需要在其中使用 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。我加载任何 FXML 文件都没有问题，除了这个讨厌的文件 (FXMLImgList.fxml)。
主要思想是按下按钮时，会出现一个新的 window。这是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();
}
包资源管理器中的项目如下所示：
https://image.ibb.co/ihGMoS/Capture.png (Can't post images)
我从 try-catch 块中得到这个异常：
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.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase.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$MouseHandler.access00(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$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$handleMouseEvent3(GlassViewEventHandler.java:417)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null7(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.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase.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$MouseHandler.access00(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$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$handleMouseEvent3(GlassViewEventHandler.java:417)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null7(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，例如这个文件：
@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();
}
此事件处理程序背后的想法几乎相同，按下按钮 -> window 打开 并且工作正常。我尝试了很多这样的操作，比如编辑返回的 URL，但似乎没有任何效果。
我注意到第 67 行的消息：
Caused by: java.lang.IllegalArgumentException: Invalid URL: unknown
protocol: c
但是结果：
System.out.println(getClass().getResource("/res/FXMLVentana.fxml"));
System.out.println(getClass().getResource("/res/FXMLImgList.fxml"));
输出：
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
这是 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，我完全没有想法，而且我在网上找到的任何东西似乎都无法解决问题。感谢任何帮助，谢谢！
在您的堆栈跟踪中有 2 个异常。
当你试图将它传递给 Scene 的构造函数时，最后的那个简单地表明 root 为 null。这是因为加载 fxml 失败。这不是因为无效的 fxml url，而是在 ImgListController.initialize 方法中创建一个 Image 的结果，其值不是 URL 作为构造函数参数。可能你传递了一个绝对文件路径。
您可以使用 File 或 Path 类 为文件获取 URL：
File f = ...
URL url = f.toURI().toURL();
Image img = new Image(url.toExternalForm());
注意： 如果发生异常，您不应该简单地继续您的逻辑，并且该方法的其余部分依赖于 try-block 无异常完成。这样你会得到 2 个异常，而不仅仅是一个。
备选方案是：
重新抛出
抛出新的 IllegalStateException("This should not happen", e1);
- 显示错误后返回 user/logging 错误。
- 等...
我一直在开发桌面应用程序，我需要在其中使用 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。我加载任何 FXML 文件都没有问题，除了这个讨厌的文件 (FXMLImgList.fxml)。
主要思想是按下按钮时，会出现一个新的 window。这是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();
}
包资源管理器中的项目如下所示：
https://image.ibb.co/ihGMoS/Capture.png (Can't post images)
我从 try-catch 块中得到这个异常：
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$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8413)
at javafx.scene.control.Button.fire(Button.java:185)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$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.access00(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$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent3(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$null7(WinApplication.java:177)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalArgumentException: Invalid URL: unknown protocol: c
at javafx.scene.image.Image.validateUrl(Image.java:1121)
at javafx.scene.image.Image.<init>(Image.java:659)
at application.ImgListController.initialize(ImgListController.java:64)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
... 61 more
Caused by: java.net.MalformedURLException: unknown protocol: c
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at javafx.scene.image.Image.validateUrl(Image.java:1115)
... 64 more
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8413)
at javafx.scene.control.Button.fire(Button.java:185)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$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.access00(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$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent3(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$null7(WinApplication.java:177)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.Trampoline.invoke(Unknown Source)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
at javafx.fxml.FXMLLoader$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，例如这个文件：
@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();
}
此事件处理程序背后的想法几乎相同，按下按钮 -> window 打开 并且工作正常。我尝试了很多这样的操作，比如编辑返回的 URL，但似乎没有任何效果。
我注意到第 67 行的消息：
Caused by: java.lang.IllegalArgumentException: Invalid URL: unknown protocol: c
但是结果：
System.out.println(getClass().getResource("/res/FXMLVentana.fxml"));
System.out.println(getClass().getResource("/res/FXMLImgList.fxml"));
输出：
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
这是 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，我完全没有想法，而且我在网上找到的任何东西似乎都无法解决问题。感谢任何帮助，谢谢！
在您的堆栈跟踪中有 2 个异常。
当你试图将它传递给 Scene 的构造函数时，最后的那个简单地表明 root 为 null。这是因为加载 fxml 失败。这不是因为无效的 fxml url，而是在 ImgListController.initialize 方法中创建一个 Image 的结果，其值不是 URL 作为构造函数参数。可能你传递了一个绝对文件路径。
您可以使用 File 或 Path 类 为文件获取 URL：
File f = ...
URL url = f.toURI().toURL();
Image img = new Image(url.toExternalForm());
注意： 如果发生异常，您不应该简单地继续您的逻辑，并且该方法的其余部分依赖于 try-block 无异常完成。这样你会得到 2 个异常，而不仅仅是一个。
备选方案是：
重新抛出
抛出新的 IllegalStateException("This should not happen", e1);
- 显示错误后返回 user/logging 错误。
- 等...