JavaFX, Gradle and JPMS reading resources always returns null

I am trying to read resources for my JavaFX application but it only works, if the module-info is not defined. If the module-info is defined, I always receive null for the following code:

// Replace ... with a specific path, for example: JavaFX_Logo.png
String url = getClass().getResource("...").toExternalForm();

Source tried:

• How do I determine the correct path for FXML files, CSS files, Images, and other resources needed by my JavaFX Application?
• https://github.com/gradle/gradle/issues/890#issuecomment-603289940

MWE: I made an minimal working example in github if someone is interested to see the output. I am using the IDE called IntelliJ and build tool called Gradle (Kotlin DSL).

• https://github.com/Zentox/ExampleFX

Example code:

package app;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;


public class App extends Application {

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

    @Override
    public void start(final Stage primaryStage) throws Exception {
        BorderPane root = new BorderPane();
        Pane pane = new Pane(root);
        String url = getClass().getResource("JavaFX_Logo.png").toExternalForm(); // Returns NPE, because getResource return null
        ImageView imageView = new ImageView(url);
        pane.getChildren().add(imageView);
        Scene scene = new Scene(pane, 1024, 768);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

}

modul-info:

module ExampleFX.main {
    requires javafx.graphics;

    exports app;
}

Resources to the image: src/main/resources/app/JavaFX_Logo.png

Build structure:

build
 ┣ classes
 ┃ ┗ java
 ┃ ┃ ┗ main
 ┃ ┃ ┃ ┗ app
 ┃ ┃ ┃ ┃ ┗ App.class
 ┣ distributions
 ┃ ┣ ExampleFX-1.0-SNAPSHOT.tar
 ┃ ┗ ExampleFX-1.0-SNAPSHOT.zip
 ┣ generated
 ┃ ┗ sources
 ┃ ┃ ┣ annotationProcessor
 ┃ ┃ ┃ ┗ java
 ┃ ┃ ┃ ┃ ┗ main
 ┃ ┃ ┗ headers
 ┃ ┃ ┃ ┗ java
 ┃ ┃ ┃ ┃ ┗ main
 ┣ libs
 ┃ ┗ ExampleFX-1.0-SNAPSHOT.jar
 ┣ resources
 ┃ ┗ main
 ┃ ┃ ┗ app
 ┃ ┃ ┃ ┗ JavaFX_Logo.png
 ┣ scripts
 ┃ ┣ ExampleFX
 ┃ ┗ ExampleFX.bat
 ┗ tmp
 ┃ ┣ compileJava
 ┃ ┃ ┗ source-classes-mapping.txt
 ┃ ┗ jar
 ┃ ┃ ┗ MANIFEST.MF

Edit:

• Added modul-info