Exception in thread "main" java.lang.reflect.InvocationTargetException JavaFX (First caused by displaying images and playing audio files)

Question

Before you guys gave me another link to look at, I have already researched my case for 2 days and had no luck :(

The question I have is how to declare the ImageView/AudioClip/MediaPlayer without getting the error message

First, let me show you the error message:

Exception in thread "main" java.lang.reflect.InvocationTargetException

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)

Caused by: java.lang.ExceptionInInitializerError
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
    ... 5 more

Caused by: java.lang.IllegalStateException: Not on FX application thread; currentThread = main
    at javafx.graphics/com.sun.javafx.tk.Toolkit.checkFxUserThread(Toolkit.java:291)
    at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(QuantumToolkit.java:424)
    at javafx.graphics/javafx.stage.Stage.<init>(Stage.java:254)
    at javafx.graphics/javafx.stage.Stage.<init>(Stage.java:240)
    at YuanGeometryWar/Output.Main.<clinit>(Main.java:18)
    ... 11 more

I know that this problem is caused because of the declaration of image:

How the line of code is now (Give me error):

URL background = this.getClass().getResource("resources/Image/MenuBackGround.jpg");
ImageView menuBack = new ImageView(new Image(background.toString()));

mainPane.getChildren().add(menuBack);

How it was before (something similar to this and it works):

try(InputStream pathIntro = Files.newInputStream(Paths.get("resources/Image/ControlBack.png"))){
        intro = new ImageView(new Image(pathIntro));

        controlPane.getChildren().add(intro);
    }

I am also having the same problem with getting audioClip or MediaPlayer to work.

I just want to know why is this causing me a problem and what is the proper way to achieve something like this?

The resources folder is not in src and is directly under the project folder

Well, the stack trace you've provided shows the following as the fundamental cause: `Caused by: java.lang.IllegalStateException: Not on FX application thread; currentThread = main`. As you can see, you're executing the problematic code on the wrong thread; execute said code on the _JavaFX Application Thread_ instead. For more specific help, please [edit] your question to provide a [mre]. — Slaw, Dec 28 '19 at 06:30

Exception in thread "main" java.lang.reflect.InvocationTargetException JavaFX (First caused by displaying images and playing audio files)

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