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Javafx交换fxml文件:线程中出现异常…invocationTargetException

invocationtargetexception runtimeexception fxml nullpointerexception
  •  1
  • Riley Fitzpatrick  · 技术社区  · 7 年前

    我有一个javafx应用程序,用户在其中按下一个按钮,加载一个新的fxml。这个很好用。但是,当我在第二个fxml上创建了另一个按钮,将用户带到第三个fxml时,我在控制台中得到了以下输出。很抱歉在下面写了这么多代码,我不知道什么是重要的或不重要的。有什么想法吗?它说有一个空指针,但我知道productivityslider.fxml的文件路径是正确的。谢谢你的帮助。 

    Jan 13, 2019 4:15:52 PM javafx.fxml.FXMLLoader$ValueElement processValue
WARNING: Loading FXML document with JavaFX API of version 10.0.1 by JavaFX runtime of version 8.0.191
Jan 13, 2019 4:15:55 PM javafx.fxml.FXMLLoader$ValueElement processValue
WARNING: Loading FXML document with JavaFX API of version 10.0.1 by JavaFX runtime of version 8.0.191
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$MouseEventNotification.run(GlassViewEventHandler.java:394)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$353(GlassViewEventHandler.java:432)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:431)
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
    at com.sun.glass.ui.View.notifyMouse(View.java:937)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
    ... 45 more
Caused by: java.lang.NullPointerException: Location is required.
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3207)
    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 application.comfortControl.loadProductivity(comfortControl.java:26)
    ... 55 more

    以下是我的主要Java文件: 

    package application;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;

public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        try {

            // Load FXML file
            Parent root = FXMLLoader.load(getClass().getResource("HumansightFirstDraft.fxml"));

            // Create scene
            Scene scene = new Scene(root, 400, 600);

            //Load CSS
            scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());

            // Display application
            primaryStage.setScene(scene);
            primaryStage.setResizable(false);
            primaryStage.show();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        launch(args);
    }
}

    下面分别是第一个和第二个fxml文件(humansightfirstdraft.fxml&comfortslider.fxml): 

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

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.effect.Blend?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>

<AnchorPane fx:id="rootPane" prefHeight="600.0" prefWidth="400.0" stylesheets="@application.css" xmlns="http://javafx.com/javafx/10.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.HumansightFirstDraftControl">
   <children>
      <Button fx:id="startSurvey" layoutX="135.0" layoutY="500.0" mnemonicParsing="false" onAction="#loadComfort" prefHeight="50.0" prefWidth="130.0" text="Daily Survey" textFill="WHITE">
         <font>
            <Font name="Oxygen" size="18.0" />
         </font>
         <effect>
            <Blend />
         </effect>
      </Button>
      <Label alignment="CENTER" focusTraversable="false" layoutX="60.0" layoutY="320.0" mouseTransparent="true" prefHeight="200.0" prefWidth="300.0" text="text1" wrapText="true">
         <font>
            <Font name="Oxygen" size="18.0" />
         </font>
      </Label>
   </children>
</AnchorPane>

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

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.Slider?>
<?import javafx.scene.effect.Blend?>
<?import javafx.scene.image.Image?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>

<AnchorPane maxHeight="600.0" maxWidth="400.0" minHeight="600.0" minWidth="400.0" prefHeight="600" prefWidth="400" xmlns="http://javafx.com/javafx/10.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.comfortControl">
   <children>
      <Label layoutX="70.0" layoutY="377.0" text="text2">
         <font>
            <Font name="Oxygen" size="18.0" />
         </font>
      </Label>
      <ImageView fitHeight="61.0" fitWidth="346.0" layoutX="32.0" layoutY="415.0" pickOnBounds="true" preserveRatio="true" style="-fx-scale-y: 1.4;">
         <image>
            <Image url="@../../bin/application/sliderColors.png" />
         </image>
      </ImageView>
      <Slider fx:id="comfortSlider" layoutX="36.0" layoutY="424.0" prefHeight="39.0" prefWidth="329.0">
         <effect>
            <Blend />
         </effect>
      </Slider>
      <Button fx:id="toProductivity" layoutX="135.0" layoutY="500.0" mnemonicParsing="false" onAction="#loadProductivity" prefHeight="50.0" prefWidth="130.0" stylesheets="@application.css" text="Next" textFill="WHITE">
         <font>
            <Font name="Oxygen" size="18.0" />
         </font>
      </Button>
   </children>
</AnchorPane>

    这里是第一个和第二个控制器Java文件,分别是: 

    package application;

import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.layout.AnchorPane;

public class HumansightFirstDraftControl implements Initializable{

    @FXML
    private AnchorPane rootPane;

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        // TODO Auto-generated method stub

    }

    @FXML
    private void loadComfort(ActionEvent event) throws IOException {
        AnchorPane pane = FXMLLoader.load(getClass().getResource("/application/comfortSlider.fxml"));
        rootPane.getChildren().setAll(pane);
    }

}

    package application;

import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.layout.AnchorPane;

public class comfortControl implements Initializable{

    @FXML
    private AnchorPane rootPane;

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        // TODO Auto-generated method stub

    }

    @FXML
    private void loadProductivity(ActionEvent event) throws IOException {
        AnchorPane pane = FXMLLoader.load(getClass().getResource("/application/productivitySlider.fxml"));
        rootPane.getChildren().setAll(pane);
    }
}
    1 回复  |  直到 7 年前
        1
  •  0
  •   Riley Fitzpatrick    7 年前

    对我来说,这是一个愚蠢的错误,但我会把我的解决方案贴在一个很可能有人和我一样愚蠢的地方。我所要做的就是将fx:id和anchorspane的名称分别更改为更具体的名称。我给两个锚窗格都取名为rootpanes,所以都很时髦。

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