Problem with loading resource Files in JavaFX

Question

so I am currently working on two JavaFX Projects and on both I have following lines of Code:

package com.fire.example;

import com.fire.example.database.SQLiteDatabase;
import com.fire.example.services.BackupService;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

import java.util.Objects;

public class FireApp extends Application {

    private final BackupService backupService = new BackupService();

    public static void main(String[] args) {
        SQLiteDatabase sqLiteDatabase = new SQLiteDatabase();
        if (sqLiteDatabase.openDBConnection()) {
            sqLiteDatabase.initDB();
        }
        launch();
    }

    @Override
    public void start(Stage stage) {
        backupService.createBackUpFolder();
        backupService.createAutomaticBackup();
        backupService.deleteBackupsOlderThanOneWeek();
        Platform.runLater(() -> {
            try {
                Parent root = FXMLLoader.load(Objects.requireNonNull(FireApp.class.getClassLoader().getResource("com.fire.example/pages/LoginPage.fxml")));
                Scene loginScene = new Scene(root,1000,700);
                stage.setScene(loginScene);
                stage.setResizable(false);
                stage.setOnCloseRequest(e -> {
                    Platform.exit();
                    System.exit(0);
                });
                stage.setTitle("Fire App");
                stage.centerOnScreen();
                stage.show();
            }catch (Exception e){
                e.printStackTrace();
                throw new RuntimeException(e);
            }
        });
    }
}

How ever, when I am trying to start the Project over IntelliJ IDE it works perfectly fine. But when starting either of the projects via ./gradlew run, it throws a Nullpointer at

FXMLLoader.load(Objects.requireNonNull(FireApp.class.getClassLoader().getResource("com.fire.example/pages/LoginPage.fxml")));

I get that it must have something to do with how the IDE and how gradlew loads the resources.

I have tried creating a jpackage and looking for the file structure but everything seems fine. Right now I have no ideads on how to fix this problem.

Any Help appreciated. Thanks in advance.