Exception thrown in main method in JavaFX - javafx

Question

I'm facing some problems while executing my main function using javafx .It appears to be a problem in loading the fxml file if I'm not mistaken but I can't seem to find how to fix it .
Exception message:
Exception in Application start method java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.launcher.LauncherHelper$FXHelper.main(Unknown Source)Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$154(LauncherImpl.java:182)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalStateException: Location is not set.
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2434)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2409)
at Gestion.view.MainClass.initialisationContenu(MainClass.java:57)
at Gestion.view.MainClass.start(MainClass.java:28)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
... 1 more
Exception running application Gestion.view.MainClass
Main function:
package Gestion.view;
import java.io.IOException;
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;
public class MainClass extends Application {
private Stage stagePrincipal;
private BorderPane conteneurPrincipal;
#Override
public void start(Stage primaryStage) {
stagePrincipal = primaryStage;
stagePrincipal.setTitle("Application de gestion du centre socio-médical OCP");
initialisationConteneurPrincipal();
initialisationContenu();
}
private void initialisationConteneurPrincipal() {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(MainClass.class.getResource("Welcome.fxml"));
try {
conteneurPrincipal = (BorderPane) loader.load();
Scene scene = new Scene(conteneurPrincipal);
stagePrincipal.setScene(scene);
stagePrincipal.show();
} catch (IOException e) {
e.printStackTrace();
}
}
private void initialisationContenu() {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(getClass()
.getClassLoader()
.getResource("Acceuil1.fxml")
);
try {
AnchorPane conteneurPersonne = (AnchorPane) loader.load();
conteneurPrincipal.setCenter(conteneurPersonne);
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
public Stage getStage() {
return null;
}
}
I've already searched in other similar questions , but the answers given did not work for me.

Answer 1

The problem is that FXMLLoader can't load an object hierarchy from FXML documents.
Fix it by updating the URLs:
loader.setLocation(MainClass.class.getResource("/fxml/Welcome.fxml"));
.getResource("/fxml/Acceuil1.fxml")
and moving Welcome.fxml and Acceuil1.fxml to src/main/resources/fxml directory.