package groovyfx;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    /**
     * Loads GroovyCIA Mainwindow
     *
     * @param primaryStage
     * @throws Exception
     */
    @Override
    public void start(Stage primaryStage) throws Exception{

        FXMLLoader loader = new FXMLLoader();
        loader.setLocation(getClass().getResource("../gui/GroovyCIA.fxml"));
        Parent root = loader.load();
        Scene scene = new Scene(root);

        scene.getStylesheets().add("gui/StyleSheet.css");
        primaryStage.setTitle("GroovyCIA (Testers FX Edition)");
        primaryStage.setScene(scene);
        primaryStage.show();
    }


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

package groovyfx;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    /**
     * Loads GroovyCIA Mainwindow
     *
     * @param primaryStage      First Stage
     * @throws                  Exception
     */
    @Override
    public void start(Stage primaryStage) throws Exception{

        FXMLLoader loader = new FXMLLoader();
        loader.setLocation(getClass().getResource("../gui/GroovyCIA.fxml"));
        Parent root = loader.load();
        Scene scene = new Scene(root);

        scene.getStylesheets().add("gui/StyleSheet.css");
        primaryStage.setTitle("GroovyCIA (Testers FX Edition)");
        primaryStage.setScene(scene);
        primaryStage.show();
    }


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

Comment added