NoSuchElementException in Stack trace, tried some other solutions in the community still not helpful

Other possible solutions I got in different forums are not working. Here is my code.

class javaFX extends Application{

	@Override
	public void start(Stage primaryStage) throws Exception{
		primaryStage.setTitle("JavaFX app");
		Label label = new Label("Hello World, JavaFX !");
    	Scene scene = new Scene(label, 400, 200);
    	primaryStage.setScene(scene);
    
		primaryStage.show();
	}
	public static void main(String args[]) {
		Application.launch(args);
	}
}

This is the StackTrace. It is showing NoSuchElementException which is a bit weird.

Exception in Application constructor
Exception in thread "main" 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 sun.launcher.LauncherHelper$FXHelper.main(Unknown Source)
Caused by: java.lang.RuntimeException: Unable to construct Application instance: class xlSheets.javaFX
	at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:907)
	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$159(LauncherImpl.java:182)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NoSuchMethodException: xlSheets.javaFX.<init>()
	at java.lang.Class.getConstructor0(Unknown Source)
	at java.lang.Class.getConstructor(Unknown Source)
	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$165(LauncherImpl.java:818)
	at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$179(PlatformImpl.java:326)
	at com.sun.javafx.application.PlatformImpl.lambda$null$177(PlatformImpl.java:295)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.sun.javafx.application.PlatformImpl.lambda$runLater$178(PlatformImpl.java:294)
	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at com.sun.glass.ui.win.WinApplication.lambda$null$152(WinApplication.java:177)
	... 1 more

The Application.launch() method uses reflection to create an instance of the Application subclass, calling its constructor taking no arguments.

According to the documentation the Appplication subclass

> must be a public subclass of Application with a public no-argument constructor

So in order for this to work, both the Application subclass and the constructor (if explicitly defined) need to be declared public.

The following fixes the problem (I also changed the class name to conform to Java naming conventions):

public class JavaFX extends Application{

    @Override
    public void start(Stage primaryStage) throws Exception{
        primaryStage.setTitle("JavaFX app");
        Label label = new Label("Hello World, JavaFX !");
        Scene scene = new Scene(label, 400, 200);
        primaryStage.setScene(scene);
    
        primaryStage.show();
    }
    public static void main(String args[]) {
        Application.launch(args);
    }
}