JavaFX: Artifact displays empty window only

Question

Preface: I am pretty new to JavaFX

Made an simple image resizing application and need to build an artifact of the application. Using IntelliJ and Eclipse (tried both), i built normal JAR artifacts and JavaFX artifacts. Both are executable, but only show an empty window.

When starting the application out of the IDE, there is no problem; the window containing all subpanes get displayed as they should.

Any ideas how to solve this problem? Thanks in advance!

Attached code of the application initialization part and a picture of the resulting windows - maybe it helps.

public class MainApp extends Application {

private Stage primaryStage;
private BorderPane rootLayout;

private SettingsViewController settingController;
private MainViewController mainViewController;

@Override
public void start(Stage primaryStage) {
    this.primaryStage = primaryStage;
    this.primaryStage.setTitle("SimpleImageResizer");

    this.primaryStage.getIcons().add(new Image("file:icon.png"));

    this.primaryStage.setOnCloseRequest(we -> ConfigurationCache.getInstance().pushConfig());

    targetResolutions.addAll(Arrays.asList(ResolutionPreset.values()));
    supportedFileFormats.addAll(Arrays.asList(SupportedFileFormat.values()));

    initRootLayout();

    showMainView();
    showSettingsView();
    primaryStage.setResizable(false);
}

public void initRootLayout() {
    try {
        // Load root layout from fxml file.
        FXMLLoader loader = new FXMLLoader();
        loader.setLocation(MainApp.class.getResource("view/RootLayout.fxml"));
        rootLayout = loader.load();

        // Show the scene containing the root layout.
        Scene scene = new Scene(rootLayout);
        primaryStage.setScene(scene);
        primaryStage.show();
    } catch (IOException e) {
        e.printStackTrace();
    }
}
.
.
.
public static void main(String[] args) {
    launch(args);
}

Answer 1

You didn't provide enough information to solve your problem, so here's an example that does work:

Create a package application and put this class into it:

application/Main.java

package application;

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 {
    @Override
    public void start(Stage primaryStage) {
        try {
            Parent root = FXMLLoader.load(getClass().getResource("/application/RootLayout.fxml"));
            Scene scene = new Scene(root,400,400);
            primaryStage.setScene(scene);
            primaryStage.show();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

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

Create a "RootLayout.fxml" in the package application.

application/RootLayout.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.AnchorPane?>


<AnchorPane xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8">
   <children>
      <Pane layoutX="-125.0" layoutY="-143.0" prefHeight="200.0" prefWidth="200.0">
         <children>
            <Button layoutX="134.0" layoutY="161.0" mnemonicParsing="false" text="Button" />
         </children>
      </Pane>
   </children>
</AnchorPane>

In Eclipse select

Export -> Runnable JAR file -> Extract required libraries into generated JAR

(of course you need to specify the proper launch configuration)

The generated JAR can be executed and has the nodes from the fxml.

Answer 2

loader.setLocation(MainApp.class.getResource("view/RootLayout.fxml"));

try with

loader.setLocation(MainApp.class.getResource("/view/RootLayout.fxml"));

NetBeans the first variant will not compile in IDE