FXML LoadException

Question

在我的程序中出现场景有问题，我还没有完成控制器类，我只是想解决它一开始就不能运行的主要问题。注意：这个按下的方法将打开这个createvideo file.This，它是来自另一个类的方法，它可以很好地工作。

@FXML
public void addPressed() {
    final FXMLLoader loader = new FXMLLoader();
    loader.setLocation(getClass().getResource("CreateVideo.fxml"));
    final CreateVideo controller = new CreateVideo();
    loader.setController(controller);
    try {
        final Parent parent = (Parent) loader.load();

        final Stage removeStage = new Stage();
        removeStage.initModality(Modality.APPLICATION_MODAL);
        removeStage.setScene(new Scene(parent, 250, 200));
        removeStage.showAndWait();

    } catch (IOException ex) {
        ex.printStackTrace();
    }
}

}

Createvideo.java

import javafx.fxml.FXML;

public class CreateVideo {

    @FXML
    private boolean Owned;
    private String titleText;
    private String directorText;
    private String Comment;
    private int playingTime;

    public CreateVideo() {
        // TODO Auto-generated constructor stub
    }

    @FXML
    public void create() {
    
    }

    @FXML
    public void cancel() {
        
    }

}

这是我创建的fxml文件的代码。

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

<?import javafx.geometry.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>

<GridPane maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="575.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1">
  <columnConstraints>
    <ColumnConstraints hgrow="SOMETIMES" maxWidth="295.0" minWidth="10.0" prefWidth="106.0" />
    <ColumnConstraints hgrow="SOMETIMES" maxWidth="506.0" minWidth="10.0" prefWidth="494.0" />
  </columnConstraints>
  <rowConstraints>
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
    <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
    <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
    <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
  </rowConstraints>
   <children>
      <Label maxHeight="1.7976931348623157E308" text="Title:" />
      <Label layoutX="10.0" layoutY="35.0" maxHeight="1.7976931348623157E308" text="Director:" GridPane.rowIndex="1" />
      <Label layoutX="10.0" layoutY="102.0" maxHeight="1.7976931348623157E308" text="Playing Time:" GridPane.rowIndex="2" />
      <Label layoutX="10.0" layoutY="169.0" maxHeight="1.7976931348623157E308" text="Comment" GridPane.rowIndex="4" />
      <Label alignment="CENTER_RIGHT" maxHeight="1.7976931348623157E308" text="Own" textAlignment="CENTER" GridPane.columnIndex="1" GridPane.halignment="CENTER" GridPane.rowIndex="3" GridPane.valignment="CENTER" />
      <CheckBox fx:id="Owned" alignment="CENTER" maxHeight="1.7976931348623157E308" mnemonicParsing="false" GridPane.columnIndex="1" GridPane.halignment="CENTER" GridPane.rowIndex="3">
         <GridPane.margin>
            <Insets bottom="10.0" left="10.0" right="60.0" top="10.0" />
         </GridPane.margin>
      </CheckBox>
      <TextField fx:id="titleText" maxHeight="1.7976931348623157E308" GridPane.columnIndex="1" />
      <TextField fx:id="directorText" layoutX="116.0" layoutY="25.0" maxHeight="1.7976931348623157E308" GridPane.columnIndex="1" GridPane.rowIndex="1" />
      <TextField fx:id="Comment" alignment="TOP_LEFT" layoutX="116.0" layoutY="69.0" maxHeight="1.7976931348623157E308" prefHeight="367.0" prefWidth="600.0" GridPane.columnSpan="2" GridPane.rowIndex="5" GridPane.rowSpan="2" />
      <Button mnemonicParsing="false" onAction="#create" text="Create" GridPane.columnIndex="1" GridPane.halignment="RIGHT" GridPane.rowIndex="7">
         <GridPane.margin>
            <Insets bottom="5.0" left="5.0" right="60.0" top="5.0" />
         </GridPane.margin>
      </Button>
      <Button alignment="CENTER_RIGHT" mnemonicParsing="false" onAction="#cancel" text="Cancel" GridPane.columnIndex="1" GridPane.halignment="RIGHT" GridPane.rowIndex="7">
         <GridPane.margin>
            <Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
         </GridPane.margin>
      </Button>
      <Slider fx:id="playingTime" blockIncrement="30.0" majorTickUnit="30.0" max="360.0" maxHeight="1.7976931348623157E308" showTickLabels="true" showTickMarks="true" value="120.0" GridPane.columnIndex="1" GridPane.rowIndex="2">
         <padding>
            <Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
         </padding>
      </Slider>
   </children>
   <padding>
      <Insets top="5.0" />
   </padding>
</GridPane>

javafx.fxml.LoadException: 
/D:/Eclipse%20workspace/uk.ac.aston.oop.javafx.assessed.video/target/classes/uk/ac/aston/oop/javafx/assessed/CreateVideo.fxml:29

    at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2707)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2685)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
    at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:2516)
    at src/uk.ac.aston.oop.javafx.assessed.ListController.addPressed(ListController.java:76)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:77)
    at jdk.internal.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at javafx.base/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:275)
    at javafx.fxml/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:84)
    at javafx.fxml/javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1854)
    at javafx.fxml/javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1724)
    at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:234)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
    at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
    at javafx.graphics/javafx.scene.Node.fireEvent(Node.java:8792)
    at javafx.controls/javafx.scene.control.Button.fire(Button.java:203)
    at javafx.controls/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:208)
    at javafx.controls/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
    at javafx.base/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:247)
    at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:234)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
    at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
    at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3897)
    at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1878)
    at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2623)
    at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:411)
    at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:301)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:450)
    at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:424)
    at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:449)
    at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:557)
    at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:943)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
    at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.lang.IllegalArgumentException: Can not set boolean field uk.ac.aston.oop.javafx.assessed.CreateVideo.Owned to javafx.scene.control.CheckBox
    at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167)
    at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171)
    at java.base/jdk.internal.reflect.UnsafeBooleanFieldAccessorImpl.set(UnsafeBooleanFieldAccessorImpl.java:86)
    at java.base/java.lang.reflect.Field.set(Field.java:799)
    at javafx.fxml/javafx.fxml.FXMLLoader.injectFields(FXMLLoader.java:1173)
    at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processValue(FXMLLoader.java:868)
    at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:762)
    at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2808)
    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2634)
    ... 60 more

Answer 1

问题在你的控制器上。在fxml代码中，您有一些fx:ids集。它们用于引用控制器中的对象。

在您的示例中，带有“CheckBox”“fx:id=”的fx:id=试图将其重新转换为CheckBox类型的属性，名为"owned“。但在控制器中它是一个布尔值。

在控制器中，您需要编写：@FXML private CheckBox owned;

(Java命名约定说属性应该以小写开头)

如果要访问是否选中复选框的布尔值，则需要访问所拥有复选框的属性。你可以通过owned.isSelected()来做这件事。

希望我能帮你？

PS：@FXML注释只适用于一个属性(后面的那个属性)；可能很快就会遇到一个错误