Scenebuilderを使用したJava FX：Start.Mainを実行している例外が例外です。

Question

このエラーは、コントローラクラスから、scenebuilderを使用してLogin.fxmlファイルにメソッドを接続してから発生します。 login.fxmlファイルのregisterボタンは、regForm.fxmlインターフェイスにリダイレクトされると想定されていますが、代わりにエラーが発生します。

'メイン' クラスコード

package sample; 

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

public class Main extends Application { 

    @Override 
    public void start(Stage primaryStage) throws Exception{ 
     Parent root = FXMLLoader.load(getClass().getResource("sample.fxml")); 
     primaryStage.setTitle("UGNiP Education portal"); 
     Scene scene = new Scene(root); 

     primaryStage.setScene(scene); 
     primaryStage.show(); 
    } 


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

'コントローラ' クラスコード

package sample; 

import javafx.fxml.FXMLLoader; 
import javafx.scene.Node; 
import javafx.scene.Parent; 
import javafx.scene.Scene; 
import javafx.stage.Stage; 

import java.awt.event.ActionEvent; 
import java.io.IOException; 

public class Controller { 

    public void regBtnClicked(ActionEvent event) throws IOException { 

     Parent regForm = FXMLLoader.load(getClass().getResource("regForm.fxml")); 
     Scene regScene = new Scene(regForm); 

     // To get the stage info 
     Stage window = (Stage) ((Node) event.getSource()).getScene().getWindow(); 


     window.setScene(regScene); 
     window.show(); 
    } 
} 

ログインページ

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

<?import javafx.scene.control.Button?> 
<?import javafx.scene.control.Label?> 
<?import javafx.scene.control.PasswordField?> 
<?import javafx.scene.control.TextField?> 
<?import javafx.scene.layout.AnchorPane?> 
<?import javafx.scene.text.Font?> 


<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="294.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.141" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller"> 
    <children> 
     <Label alignment="TOP_CENTER" layoutX="126.0" text="UGNiP Login Page"> 
     <font> 
      <Font size="43.0" /> 
     </font> 
     </Label> 
     <Label layoutX="66.0" layoutY="78.0" prefHeight="17.0" prefWidth="44.0" text="I.D: "> 
     <font> 
      <Font size="14.0" /> 
     </font> 
     </Label> 
     <TextField layoutX="126.0" layoutY="74.0" promptText="123456789" /> 
     <Label layoutX="309.0" layoutY="78.0" prefHeight="17.0" prefWidth="65.0" text="Password:"> 
     <font> 
      <Font size="14.0" /> 
     </font> 
     </Label> 
     <PasswordField layoutX="401.0" layoutY="74.0" promptText="******" /> 
     <Button layoutX="253.0" layoutY="188.0" mnemonicParsing="false" text="Login" /> 
     <Button layoutX="344.0" layoutY="188.0" mnemonicParsing="false" onAction="#regBtnClicked" text="Register" /> 
    </children> 
</AnchorPane> 

login.fxmlため登録フォームのXMLファイル

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

<?import javafx.scene.control.Button?> 
<?import javafx.scene.control.Label?> 
<?import javafx.scene.control.PasswordField?> 
<?import javafx.scene.control.TextField?> 
<?import javafx.scene.layout.AnchorPane?> 
<?import javafx.scene.text.Font?> 


<AnchorPane prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.141" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller"> 
    <children> 
     <TextField layoutX="130.0" layoutY="119.0" promptText="John" /> 
     <TextField layoutX="408.0" layoutY="119.0" promptText="Doe" /> 
     <TextField layoutX="130.0" layoutY="175.0" promptText="123456789" /> 
     <PasswordField layoutX="408.0" layoutY="175.0" promptText="********" /> 
     <TextField layoutX="130.0" layoutY="224.0" promptText="example@example.com" /> 
     <TextField layoutX="408.0" layoutY="224.0" promptText="0771234567" /> 
     <Label layoutX="36.0" layoutY="123.0" text="First Name: " /> 
     <Label layoutX="15.0" layoutY="179.0" text="Identification code: " /> 
     <Label layoutX="52.0" layoutY="228.0" text="Email:" /> 
     <Label layoutX="322.0" layoutY="123.0" text="Last Name: " /> 
     <Label layoutX="325.0" layoutY="179.0" text="Password: " /> 
     <Label layoutX="299.0" layoutY="228.0" text="Telephone Number: " /> 
     <Button layoutX="244.0" layoutY="298.0" mnemonicParsing="false" text="Confirm Registration " /> 
     <Button layoutX="32.0" layoutY="354.0" mnemonicParsing="false" text="Back" /> 
     <Label layoutX="225.0" layoutY="42.0" text="Registration "> 
      <font> 
       <Font size="30.0" /> 
      </font> 
     </Label> 
     <Button layoutX="248.0" layoutY="354.0" mnemonicParsing="false" text="Cancel Registration " /> 
    </children> 
</AnchorPane> 

コンソールでのエラーメッセージ

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:748) 
Caused by: javafx.fxml.LoadException: Error resolving onAction='#regBtnClicked', either the event handler is not in the Namespace or there is an error in the script. 
/C:/Users/muizu/Documents/codes/cwk3/out/production/cwk3/sample/Login.fxml:31 

    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$ValueElement.processEndElement(FXMLLoader.java:770) 
    at javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2823) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2532) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104) 
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097) 
    at sample.Main.start(Main.java:13) 
    at com.sun.javafx.application.LauncherImpl.lambda$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 sample.Main 

Answer 1

お使いのコントローラがそれでregBtnClickedという名前のメソッドを持つ必要があります。

@FXML private void regBtnClicked(ActionEvent event) 
{ 
    .... 
}