JavaFX: Need help understanding setControllerFactory

JavaFX: Need help understanding setControllerFactory

By : Immanuel Julianto La
Date : October 17 2020, 06:10 PM
this one helps.
I repeatedly came across the method setControllerFactory. Unfortunately I can't find a good explanation for how to use it properly and what it's specific purpose is
code :
FXMLLoader loader = new FXMLLoader(...);
loader.setControllerFactory(c -> {
   return new MyController("foo", "bar");
public enum View {

    public final String location;

    View(String location) {
        this.location = "/views/" + location;
public final class MyApp extends Application {

    // Singleton
    private static MyApp singleton;
    public MyApp() { singleton = this; }
    public static MyApp getSingleton() { return singleton; }

    // Main window
    private Stage stage;

    private Map<View, Parent> parents = new HashMap<>();

    public void start(Stage primaryStage) {
        stage = primaryStage;
        stage.setTitle("My App");
        stage.setScene(new Scene(parents.get(View.LOGIN)));

    public void add(View view) {
        var loader = new FXMLLoader(getClass().getResource(view.location));

        try {
            Parent root = loader.load();
            parents.put(view, root);
        } catch (IOException e) { /* Do something */ }

    public void remove(View view) {

    public void activate(View view) {

    public void removeAllAndActivate(View view) {
public final class Login implements Initializable {

    MyApp app = MyApp.getSingleton();

    // Some @FXML variables here..

    @FXML private void login() {
        // Authenticate..

    @FXML private void createAccount() {

    public void initialize(URL url, ResourceBundle rb) {}

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By : sneha
Date : March 29 2020, 07:55 AM
around this issue My code has gotten quite large and so I've decided to build a runnable JAR to see how it's done. I probably should've tried sooner because I'm getting 2 different errors related to the project structure, first is the "no main manifest attribute error" when trying to run the JAR from command prompt. Double-clicking the JAR does nothing (Win7). The second issue is related to the FXMLLoader explained lower down. , Is my project structure incorrect?
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Checking the SDK for my pc revealed that there was no SDK selected. I'm not sure how it was working before.
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