错误切换与FXML

场景所以，我想这样转2个FXML文件之间的场景，但如果我尝试启动应用程序，我得到这个错误：错误切换与FXML

Exception in Application start method 
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 com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389) 
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328) 
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.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767) 
Caused by: java.lang.RuntimeException: Exception in Application start method 
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917) 
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182) 
at java.lang.Thread.run(Thread.java:745) 
Caused by: javafx.fxml.LoadException: Error resolving onAction='#handleButtonAction', either the event handler is not in the Namespace or there is an error in the script. 

/C:/Users/j3Ypi/Dropbox/05_Praktikum/survey/out/production/survey/survey/view/moduleA.fxml:28 
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2597) 
at javafx.fxml.FXMLLoader.access$100(FXMLLoader.java:103) 
at javafx.fxml.FXMLLoader$Element.processEventHandlerAttributes(FXMLLoader.java:610) 
at javafx.fxml.FXMLLoader$ValueElement.processEndElement(FXMLLoader.java:770) 
at javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2823) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2532) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441) 
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2409) 
at survey.Main.showModuleA(Main.java:40) 
at survey.Main.start(Main.java:24) 
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863) 
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326) 
at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295) 
at java.security.AccessController.doPrivileged(Native Method) 
at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294) 
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95) 
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) 
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191) 
... 1 more 
Exception running application survey.Main

我尝试了几种方法来加载FXML文件，但每次发生相同的错误。我也试过了社区建议的多种潜在解决方案，但似乎没有解决我的问题。他们中的大多数人表示这将是一个正确的路径，但我在控制器中加载了与主应用中完全相同的路径，并且在控制器中没有正确启动应用程序的handleButtonAction（）。现在我几个小时都在坚持这项基本任务。我使用IDEA，这里是我的代码：

主营：

package survey; 

import javafx.application.Application; 
import javafx.fxml.FXMLLoader; 
import javafx.scene.Scene; 
import javafx.scene.layout.AnchorPane; 
import javafx.scene.layout.BorderPane; 
import javafx.stage.Stage; 

import java.io.IOException; 

public class Main extends Application { 

private Stage primaryStage; 
private BorderPane rootLayout; 

@Override 
public void start(Stage primaryStage) throws Exception{ 
    this.primaryStage = primaryStage; 
    this.primaryStage.setTitle("Modul A"); 

    initRootlayout(); 

    showModuleA(); 
} 

private void initRootlayout() throws IOException{ 
     FXMLLoader loader = new FXMLLoader(); 
     loader.setLocation(Main.class.getResource("view/rootLayout.fxml")); 
     rootLayout = loader.load(); 

     Scene scene = new Scene(rootLayout); 
     primaryStage.setScene(scene); 
     primaryStage.show(); 
} 

private void showModuleA() throws IOException { 
     FXMLLoader loader = new FXMLLoader(); 
     loader.setLocation(Main.class.getResource("view/moduleA.fxml")); 
     AnchorPane rootPane = loader.load(); 

     rootLayout.setCenter(rootPane); 
} 


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

控制器：

package survey.view; 

import javafx.fxml.FXML; 
import javafx.fxml.FXMLLoader; 
import javafx.fxml.Initializable; 
import javafx.scene.Parent; 
import javafx.scene.Scene; 
import javafx.scene.control.Button; 
import javafx.stage.Stage; 

import java.awt.event.ActionEvent; 
import java.io.IOException; 
import java.net.URL; 
import java.util.ResourceBundle; 

public class moduleAController implements Initializable { 

@FXML private Button bBack; 
@FXML private Button bForward; 

@FXML 
private void handleButtonAction(ActionEvent event) throws IOException{ 

    Stage stage; 
    Parent root; 

    if (event.getSource() == bBack){ 
     stage = (Stage) bBack.getScene().getWindow(); 
     root = FXMLLoader.load(getClass().getResource("view/moduleB.fxml")); 
    } else { 
     stage = (Stage) bForward.getScene().getWindow(); 
     root = FXMLLoader.load(getClass().getResource("view/moduleA.fxml")); 
    } 

    Scene scene = new Scene(root); 
    stage.setScene(scene); 
    stage.show(); 

} 

@Override 
public void initialize(URL location, ResourceBundle resources) { 

} 
}

FXML：

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

<?import javafx.scene.control.Button?> 
<?import javafx.scene.control.Label?> 
<?import javafx.scene.control.RadioButton?> 
<?import javafx.scene.control.TextArea?> 
<?import javafx.scene.control.ToggleGroup?> 
<?import javafx.scene.layout.AnchorPane?> 
<?import javafx.scene.layout.BorderPane?> 
<?import javafx.scene.layout.ColumnConstraints?> 
<?import javafx.scene.layout.GridPane?> 
<?import javafx.scene.layout.RowConstraints?> 

<AnchorPane fx:id="rootPane" prefHeight="470.0" prefWidth="950.0" styleClass="background" stylesheets="@DarkTheme.css" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="survey.view.moduleAController"> 
    <children> 
     <BorderPane layoutX="12.0" prefHeight="470.0" prefWidth="950.0"> 
     <top> 
      <GridPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="62.0" prefWidth="450.0" BorderPane.alignment="BOTTOM_RIGHT"> 
       <columnConstraints> 
       <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> 
        <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> 
        <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> 
      </columnConstraints> 
       <rowConstraints> 
       <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> 
      </rowConstraints> 
       <children> 
        <Button fx:id="bBack" mnemonicParsing="false" onAction="#handleButtonAction" prefHeight="30.0" prefWidth="110.0" text="Zurück" GridPane.columnIndex="1" /> 
        <Button fx:id="bForward" mnemonicParsing="false" onAction="#handleButtonAction" prefHeight="30.0" prefWidth="110.0" text="Vorwärts" GridPane.columnIndex="2" /> 
        <Label fx:id="lModul" text="Modul:" GridPane.halignment="CENTER" GridPane.valignment="CENTER" /> 
      </children> 
     </GridPane> 
    </top> 
     <left> 
      <GridPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="300.0" prefWidth="100.0" BorderPane.alignment="CENTER"> 
       <columnConstraints> 
       <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> 
      </columnConstraints> 
       <rowConstraints> 
        <RowConstraints maxHeight="126.0" minHeight="10.0" prefHeight="95.0" vgrow="SOMETIMES" /> 
       <RowConstraints maxHeight="126.0" minHeight="10.0" prefHeight="95.0" vgrow="SOMETIMES" /> 
       <RowConstraints maxHeight="180.0" minHeight="10.0" prefHeight="104.0" vgrow="SOMETIMES" /> 
       <RowConstraints maxHeight="253.0" minHeight="10.0" prefHeight="95.0" vgrow="SOMETIMES" /> 
      </rowConstraints> 
       <children> 
        <Label fx:id="lFrageA" text="1. Frage A" GridPane.halignment="CENTER" GridPane.rowIndex="1" /> 
        <Label fx:id="lFrageB" text="2. Frage B" GridPane.halignment="CENTER" GridPane.rowIndex="2" /> 
        <Label fx:id="lFrageC" text="3. Frage C" GridPane.halignment="CENTER" GridPane.rowIndex="3" /> 
       <Label text="Modul A" GridPane.halignment="CENTER" /> 
      </children> 
     </GridPane> 
    </left> 
     <center> 
      <GridPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="300.0" prefWidth="189.0" BorderPane.alignment="CENTER"> 
       <columnConstraints> 
       <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> 
       <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> 
      </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> 
       <children> 
        <RadioButton fx:id="bCheckA1" mnemonicParsing="false" GridPane.halignment="CENTER" GridPane.rowIndex="1"> 
        <toggleGroup> 
         <ToggleGroup fx:id="groupA" /> 
       </toggleGroup> 
       </RadioButton> 
        <RadioButton fx:id="bCheckA2" mnemonicParsing="false" toggleGroup="$groupA" GridPane.columnIndex="1" GridPane.halignment="CENTER" GridPane.rowIndex="1" /> 
        <RadioButton fx:id="bCheckB1" mnemonicParsing="false" GridPane.halignment="CENTER" GridPane.rowIndex="2"> 
        <toggleGroup> 
         <ToggleGroup fx:id="groupB" /> 
       </toggleGroup></RadioButton> 
        <RadioButton fx:id="bCheckB2" mnemonicParsing="false" toggleGroup="$groupB" GridPane.columnIndex="1" GridPane.halignment="CENTER" GridPane.rowIndex="2" /> 
        <RadioButton fx:id="bCheckC1" mnemonicParsing="false" GridPane.halignment="CENTER" GridPane.rowIndex="3"> 
        <toggleGroup> 
         <ToggleGroup fx:id="groupC" /> 
       </toggleGroup></RadioButton> 
        <RadioButton fx:id="bCheckC2" mnemonicParsing="false" toggleGroup="$groupC" GridPane.columnIndex="1" GridPane.halignment="CENTER" GridPane.rowIndex="3" /> 
        <Label fx:id="lTrue" text="trifft zu" GridPane.halignment="CENTER" /> 
        <Label fx:id="lFalse" text="trifft nicht zu" GridPane.columnIndex="1" GridPane.halignment="CENTER" /> 
      </children> 
     </GridPane> 
    </center> 
     <bottom> 
      <GridPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="62.0" prefWidth="600.0" BorderPane.alignment="BOTTOM_CENTER"> 
       <columnConstraints> 
       <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> 
       <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> 
        <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> 
      </columnConstraints> 
       <rowConstraints> 
       <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> 
      </rowConstraints> 
       <children> 
        <Button mnemonicParsing="false" prefHeight="30.0" prefWidth="160.0" text="Neue Befragung" GridPane.halignment="CENTER" /> 
        <Button fx:id="bSave" mnemonicParsing="false" prefHeight="30.0" prefWidth="130.0" text="Speichern" GridPane.columnIndex="1" GridPane.halignment="CENTER" /> 
        <Button mnemonicParsing="false" prefHeight="30.0" prefWidth="130.0" text="Auswertung" GridPane.columnIndex="2" GridPane.halignment="CENTER" /> 
      </children> 
     </GridPane> 
    </bottom> 
     <right> 
      <GridPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="300.0" prefWidth="300.0" BorderPane.alignment="CENTER_RIGHT"> 
       <columnConstraints> 
       <ColumnConstraints hgrow="SOMETIMES" maxWidth="-Infinity" minWidth="10.0" prefWidth="100.0" /> 
      </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> 
       <children> 
        <TextArea maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="70.0" prefWidth="250.0" GridPane.rowIndex="1" /> 
        <TextArea maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="70.0" prefWidth="250.0" GridPane.rowIndex="2" /> 
        <TextArea maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="70.0" prefWidth="250.0" GridPane.rowIndex="3" /> 
        <Label text="Kommentar" /> 
      </children> 
     </GridPane> 
    </right> 
    </BorderPane> 
</children> 
</AnchorPane>

我感谢所有帮助。提前致谢！

编辑：除了错误导入Action Action之外，路径中还是有一个错误。控制器位于视图文件夹中，因此路径仅为moduleB.fxml而不是view/moduleB.fxml。

感谢您的帮助！

来源

2017-08-30 jeypeu

你的第二个问题的解决方案如下：

root = FXMLLoader.load(getClass().getClassLoader().getResource("xxx/yyy/view/moduleB.fxml)"

其中xxx和yyy是从你的Java项目中的封装结构。例如src/foo/var/view/moduleB.fxml - >“foo/var/view/moduleB.fxml”

您之所以试图在运行时加载它，需要添加getClassLoader()您将从控制器获得实际的班级路径，因为您正在调用控制器中的getClass()方法。这就是它无法找到你的fxml文件的原因。它期望它位于控制器包的底层视图包中。我希望它现在的作品:)

第一个问题：

你在你的控制脚本有一个小错误。你输入了错误的ActionEvent。你进口

import java.awt.event.ActionEvent;

但需要导入

import javafx.event.ActionEvent;

这应该修复它。

来源

2017-08-30 08:24:25 phaen

哦，我的上帝，你是对的！谢谢。但实际上还有另一个错误。控制器不在主文件夹中，但在视图文件夹中。因此，除了导入ActionEvent的错误外，该路径也是错误的。 – jeypeu

错误切换与FXML

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