Comment rendre main.java pour exécuter une application qui est conçue par le constructeur de la scène?

Question

J'ai essayé de construire une scène simple en utilisant un générateur de scènes. Mais j'ai échoué à faire un fichier main.java pour exécuter le code! Je ne peux pas comprendre quel est le problème!

Voici mon FXMLDocumentController.java fichier:

import javafx.event.ActionEvent; 
import javafx.fxml.FXML; 

public class FXMLDocumentController { 

    @FXML 
    void btnHandle(ActionEvent event) { 
    } 

} 

Et voici le fichier FXML: sample.fxml

Et le Main.java

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

public class Main extends Application { 

    @Override 
    public void start(Stage stage) throws Exception { 
     Parent root = FXMLLoader.load(getClass().getResource("sample.fxml")); 

     Scene scene = new Scene(root); 

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

    /** 
    * @param args the command line arguments 
    */ 
    public static void main(String[] args) { 
     launch(args); 
    } 
} 

Quand je lance ce code afficher l'erreur et n'a pas pu générer: Exception dans la méthode de démarrage d'application

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$155(LauncherImpl.java:182) 
    at java.lang.Thread.run(Thread.java:745) 
Caused by: java.lang.NullPointerException: Location is required. 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3207) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124) 
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104) 
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097) 
    at Main.start(Main.java:15) 
    at com.sun.javafx.application.LauncherImpl.lambda$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 Main 
C:\Users\Dell\Desktop\Exercise\Java\BasicXml\nbproject\build-impl.xml:1052: The following error occurred while executing this line: 
C:\Users\Dell\Desktop\Exercise\Java\BasicXml\nbproject\build-impl.xml:806: Java returned: 1 
BUILD FAILED (total time: 0 seconds) 

Answer 1

Je suggère de cange la classe racine dans la principale de Parent à AnchorPane:

public class Main extends Application { 
    @Override 
    public void start(Stage stage) throws Exception { 

    AnchorPane root = FXMLLoader.load(getClass().getResource("sample.fxml")); 

    Scene scene = new Scene(root); 

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

/** 
* @param args the command line arguments 
*/ 
    public static void main(String[] args) { 
    launch(args); 
    } 
}