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JavaFX How to put FXML Controller Instance to HashMap?

I have many FXML with different Controller and I want to access all Controller Instance in one class using static methods. The reason I am doing this because I want to change the UI of different FXML from different controller. I'm not sure if there is any better way to do it. My problem is in my SceenViews class because I don't know what datatype to use to hold FXML Controller Instance in my controllerMap variable.
Inside my Package: Main.java, ScreenViews.java, Frame.FXML, FrameController.java, Login.FXML, LoginController.java, Dashboard.FXML, DashboardController.java, Journal.FXML, and JournalController.java
Main.java
public class Main extends Application {
#Override
public void start(Stage stage) throws Exception {
ScreenViews.loadFXML("Frame", "Frame.fxml");
ScreenViews.loadFXML("Login", "Login.fxml");
ScreenViews.loadFXML("Dashboard", "Dashboard.fxml");
ScreenViews.loadFXML("Journal", "Journal.fxml");
Scene scene = new Scene((Parent) ScreenViews.getView("Frame"));
scene.setFill(Color.TRANSPARENT);
stage.initStyle(StageStyle.TRANSPARENT);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
In my ScreenViews.java what datatype can I use to hold different controller instance in my controllerMap variable?
public class ScreenViews {
private static HashMap<String, Node> viewMap = new HashMap<>();
//HASHMAP FOR CONTROLLER INSTANCE
private static HashMap<String, datatype? > controllerMap = new HashMap<>();
public static void addView(String name, Node screen) {
viewMap.put(name, screen);
}
public static Node getView(String name) {
return viewMap.get(name);
}
public static void addController(String name, datatype? controller) {
controllerMap.put(name, controller);
}
public static datatype? getController(String name) {
return controllerMap.get(name);
}
public static boolean loadFXML(String name, String resource) {
try {
FXMLLoader fxLoader = new
FXMLLoader(ScreenViews.class.getResource(resource));
Parent loadedFXML = (Parent) fxLoader.load();
addView(name, loadedFXML);
addController(name, fxLoader.getController());
return true;
} catch (IOException e) {
System.out.println(e.getMessage());
return false;
}
}
}
Sample LoginController.java code
public class LoginController implements Initializable {
#Override
public void initialize(URL url, ResourceBundle rb) {
}
#FXML
public void frameSetUI(ActionEvent event) {
ScreenViews.getController("Frame").getFramePane().getChildren().add(ScreenViews.get("Dashboard"));
}
}
Sample FrameController.java code
public class FrameController implements Initializable {
#FXML private StackPane rootPane;
#FXML private AnchorPane titleBar;
#FXML private AnchorPane framePane;
#FXML private Button toDashboard;
#FXML private AnchorPane mainPane;
public void initialize(URL url, ResourceBundle rb) {
}
public AnchorPane getFramePane(){
return framePane;
}
}

JavaFX setText() NullPointerException even though I have set controller and fxml tags

I am trying to fill data into my new scene when I switch to it. The user logs in (which is working because if I toString() him I get everything I need). When I call setText() on the JFXTextField for example, it does not work.
This is my controller. Updatehome is called when I switch to this scene
public class DashboardController {
#FXML JFXTextField txtGastDashboardSuchfeld;
#FXML Label lblGastDashboardNachnameVorname;
#FXML JFXTextField txtGastHomeVorname;
#FXML JFXTextField txtGastHomeNachname;
#FXML JFXTextField txtGastHomeSteuernummer;
#FXML JFXTextField txtGastHomeAusweisnummer;
#FXML JFXTextField txtGastHomeEmail;
#FXML JFXPasswordField pwfGastHomePasswort;
public void updateHome() {
if(Main.user == null) {
Controller.errorMessage("Fataler Fehler", "User konnte nicht aufgelöst werden!");
return;
}
System.out.println(Main.user.toString());
lblGastDashboardNachnameVorname.setText(Main.user.getVollername());
txtGastHomeVorname.setText(Main.user.getVorname());
txtGastHomeNachname.setText(Main.user.getNachname());
txtGastHomeSteuernummer.setText(Main.user.getSteuernummer());
txtGastHomeAusweisnummer.setText(Main.user.getAusweisnummer());
txtGastHomeEmail.setText(Main.user.getEmailAdresse());
pwfGastHomePasswort.setText(Main.user.getPasswort().toString());
}
}
In my Main class I have this (Scenes are being loaded)
public static Controller controller;
public static DashboardController dashboardController;
public static Person user = null;
public static Stage window;
public static TreeMap<String, Scene> scenes = new TreeMap<>();
public static ArrayList<Scene> history = new ArrayList<>();
#Override
public void start(Stage primaryStage) {
window = primaryStage;
controller = new Controller();
dashboardController = new DashboardController();
loadScenes();
}
This is a snippet from the method that loads the scenes into my treemap
FXMLLoader loader = new FXMLLoader(getClass().getResource(fxmlPath));
try {
if(sceneName.contains("dashboard")) {
loader.setController(dashboardController);
} else
loader.setController(controller);
Parent parent = (Parent)loader.load();
scenes.put(sceneName, new Scene(parent));

JavaFX TableView Issues Adding Rows + Organizing Multi Controller and FXML App

I'm new to JavaFX and I've been at this code for about 8 hours now and I've become a bit delusional with the code. My two main problems are:
Can't add new items to the TableView using my popUp box display().
Feels messy and unorganized. Any tips for better communication between FXML and Controllers? (Again I'm new so it could be that I've stared too long at it)
My main class
public class Main extends Application {
public static Stage primaryStage;
public static void main(String[] args) {
launch(args);
}
#Override
public void start(Stage window) throws Exception {
try {
primaryStage = new Stage();
window = primaryStage;
Parent root = FXMLLoader.load(getClass().getResource("Fissto.fxml"));
Scene scene = new Scene(root);
window.setTitle("Fissto - the File Storage App!");
window.setScene(scene);
window.show();
}catch(Exception e){
e.printStackTrace();
}
// C.setLibraryStage();
}
}
My main Controller class (I have two sub ones that connect in the Fissto.fxml)
public class Controller implements Initializable{
Main main;
#FXML LibraryController libraryController = new LibraryController();
#FXML MergePageController mergePageController = new MergePageController();
private AddImageController addImageController = new AddImageController();
#FXML public void initialize(URL location, ResourceBundle resources){
System.out.println("View is now loaded!");
main = new Main();
libraryController.init(this);
mergePageController.init(this);
addImageController.init(this);
}
//Interface Initialization
public void setMergeStage() throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("Controllers/MergePage.fxml"));
Scene scene = new Scene(root);
main.primaryStage.setScene(scene);
}
public void setLibraryStage() throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("Controllers/LibraryPage.fxml"));
Scene scene = new Scene(root);
main.primaryStage.setScene(scene);
}
//Closing a window
public void closeWindow(){
main.primaryStage.close();
}
}
And finally the controller for the page that holds the TableView
public class LibraryController {
private Controller main;
//Library TableView Controllers
#FXML public TableView<Image> library;
#FXML private TableColumn<Image, String> NameColumn = new TableColumn<>();
#FXML private TableColumn<Image, ArrayList<String>> TagsColumn = new TableColumn<>();
#FXML private TableColumn<Image, String> CommentsColumn = new TableColumn<>();
#FXML private TableColumn<Image, String> FileLocationColumn = new TableColumn<>();
#FXML private TableColumn<Image, Integer> PointsColumn = new TableColumn<>();
public void init(Controller main){
System.out.println("LibraryPage Loading");
this.main = main;
addDataToColumns();
library = new TableView<>();
library.getItems().setAll(getImages());
System.out.println("LibraryPage Loaded");
}
//Initializes the column titles
private void addDataToColumns(){
NameColumn.setCellValueFactory(new PropertyValueFactory<>("name"));
TagsColumn.setCellValueFactory(new PropertyValueFactory<>("tags")); //TODO Convert to String format
CommentsColumn.setCellValueFactory(new PropertyValueFactory<>("comments"));
FileLocationColumn.setCellValueFactory(new PropertyValueFactory<>("filelocation"));
PointsColumn.setCellValueFactory(new PropertyValueFactory<>("points"));
}
//Gets all of the images
private ObservableList<Image> getImages() {
//TODO: Add where to actually get the data from
ObservableList<Image> images = FXCollections.observableArrayList();
String s = "Dog, Cat, Jumping Jack,";
ArrayList<String> list = Image.getTagOrganizer(',', s);
images.add(new Image("Test", list, "Comment", "No File Location, yet!", 10));
String k = "Calculus, Complex Numbers, Hard dude,";
ArrayList<String> list2 = Image.getTagOrganizer(',', k);
images.add(new Image("Number2", list2, "I love MathClub", "No File Location, yet!", -10));
return images;
}
This last class is the popup menu that takes in input to put in the GridPane
public class AddImageController {
private Controller main;
public void init(Controller main){
System.out.println("ImagePage Loaded");
this.main = main;
}
//Submitting an image to the library from the AddImagePage
public TextField nameInput;
public TextField tagsInput;
public TextField commentInput;
public TextField pointsInput;
public Label errorMessage;
/** TODO: Make it so that it writes to file then theoretically, the main controller should read from file every so often
* Main functionality for adding the information from the form to the database */
public void submitImage(){
if(!(nameInput.getText().trim().isEmpty()) && !(tagsInput.getText().trim().isEmpty()) && !(pointsInput.getText().trim().isEmpty())) {
if (isInt(pointsInput)) {
// System.out.print("Sent to database, *whoosh!*");
LibraryController c = new LibraryController();
ArrayList<String> s = Image.getTagOrganizer(',', tagsInput.getText());
Image image = new Image(nameInput.getText(), s, commentInput.getText(),"Location Needed", Integer.parseInt(pointsInput.getText()));
c.library.getItems().add(image);
clearInputs();
}
}else {
errorMessage.setText("Fill every field");
}
}
//Clears the input fields in the AddImagePage
public void clearInputs(){
nameInput.clear();
tagsInput.clear();
commentInput.clear();
pointsInput.clear();
errorMessage.setText("");
}
//Submission format verifiers
private boolean isInt(TextField input){
try{
int i = Integer.parseInt(input.getText());
errorMessage.setText("");
return true;
}catch (NumberFormatException e){
System.out.println("Oh no: " + input.getText() + " is not an integer");
errorMessage.setText("Points must be a number");
return false;
}
}
//Image Selection Handler
public void imageSelectionHandler(){
}
}
I understand it may be hard to read, so any feedback on how to make it easier to read in the future is much appreciated.

JavaFX Passing Stage/Switching Scene

I have decided to update my application using JavaFXML, However I am having difficulties passing a scene into my controller. Here is my Controller;
public class MainApp extends Application {
#FXML
public Stage primaryStage;
#FXML
private AnchorPane rootLayout;
#FXML
private JobInterface jInterface;
#Override
public void start(Stage primaryStage) {
primaryStage = new Stage();
setPrimaryStage(primaryStage);
initRootLayout();
}
#FXML
public void initRootLayout(){
try {
primaryStage = getPrimaryStage();
FXMLLoader loader = new FXMLLoader();
loader.setLocation(MainApp.class.getResource("MainInterface.fxml"));
rootLayout = (AnchorPane) loader.load();
Scene scene = new Scene(rootLayout);
primaryStage.setScene(scene);
primaryStage.show();
setPrimaryStage(primaryStage);
} catch (IOException e) {
e.printStackTrace();
}
}
#FXML
private void setJobLayout(){
primaryStage = getPrimaryStage();
jInterface = new JobInterface();
jInterface.initJobLayout();
primaryStage.setScene(jInterface.getScene());
}
public static void main(String[] args) {
launch(args);
}
public Stage getPrimaryStage() {
return primaryStage;
}
public void setPrimaryStage(Stage primaryStage) {
this.primaryStage = primaryStage;
}
}
Here is a method that is changing the scene using a different FXML file and attempting to pass the scene back to the controller;
public class JobInterface {
private AnchorPane rootLayout;
private Scene scene;
public void initJobLayout(){
try {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(MainApp.class.getResource("JobInterface.fxml"));
rootLayout = (AnchorPane) loader.load();
scene = new Scene(rootLayout);
setScene(scene);
} catch (IOException e) {
e.printStackTrace();
}
}
public Scene getScene() {
return scene;
}
public void setScene(Scene scene) {
this.scene = scene;
}
}
The issue I'm having now is a NullPointerException on this line in the main app;
primaryStage.setScene(jInterface.getScene());
I am trying to pass a Stage between methods so that I can only update the Scene and not have to open a new Stage everytime a new method is called. Any ideas on where I am going wrong?

There should be no need to pass the stage or scene. Your Main will load the fxml resource which will have your fxml controller 'in charge' of your fxml file.
#Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("jobController.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
Your controller might look something like this (depending on your fxml design):
public class JobController {
#FXML
private Label label;
#FXML
private void handleButtonAction(ActionEvent event) {
label.setText("This is the controller speaking");
}
}
Now you can 'control' your stage (scene) from the controller. If you are going to create another class which also has to update the scene, pass a reference to the controller to it e.g. from the controller:
TimeClock timeClock = new TimeClock();
timeClock.init(this);
and then in TimeClock.java you have:
private final JobController controller;
public void init (JobController control){
this.controller = control;
}
Now you can access any public method in your controller from the TimeClock class. E.g.
controller.updateLabel("Time clock speaking!");

JavaFX - How to add Item to ListView from different Stage?

How can i add an item to an already existing ListView from a different Stage (Window).
Basically i just want to add Text to the ListView from Window 2 to the ListView in Window 1.
Thanks in advance.
Sorry i forgot this is what i've got so far in my controller class: (im a beginner in javafx ..)
(below i try to add a String to the ListView but this doesnt work...and i dont know why )
public class ClientGUIController implements Initializable {
#FXML private Text usernameText;
#FXML private Button cancelButtonNewDate;
#FXML private TextField newDateTitel,newDateJahr;
#FXML private TextArea newDateNotiz;
#FXML private ComboBox<String> newDateTag,newDateMonat,newDateStunde,newDateMinute;
#FXML private ListView<String> terminListView;
private ObservableList<String> termine =
FXCollections.observableArrayList();
private ObservableList<String> listItems = FXCollections.observableArrayList("Add Items here");
#Override
public void initialize(URL location, ResourceBundle resources) {
}
public Text getUsernameText() {
return usernameText;
}
public void setUsernameText(String username ) {
this.usernameText.setText(username);
terminListView.setItems(listItems);
listItems.add("test");
}
public void newDate() {
Stage newDate = new Stage();
Parent root;
try {
root = FXMLLoader.load(getClass().getResource("newDate.fxml"));
// FXMLLoader loader = new FXMLLoader();
// root = (Parent) loader.load(getClass().getResource("NewDate.fxml").openStream());
} catch (IOException e) {
e.printStackTrace();
return;
}
Scene sceneNewDate = new Scene(root);
// sceneNewDate.getStylesheets().add(getClass().getResource("Style.css").toExternalForm());
newDate.setTitle("Neuer Termin");
newDate.setScene(sceneNewDate);
newDate.show();
}
public void createNewDate() throws IOException {
// Termine meinTermin = new Termine(Integer.parseInt(newDateTag.getValue()), Integer.parseInt(newDateMonat.getValue()), Integer.parseInt(newDateJahr.getText()), newDateTitel.getText(), newDateNotiz.getText(),
// Integer.parseInt(newDateStunde.getValue()), Integer.parseInt(newDateMinute.getValue()));
//Add item to ListView
listItems.add("test"); <- this doesnt work
}
public void closeDialogue(){
Stage stage = (Stage) cancelButtonNewDate.getScene().getWindow();
stage.close();
}
}

One way to do this is to pass listItems to the controller for newDate.fxml, so it can just add to that list. So, assuming the controller class for newDate.fxml is NewDateController, you would do something like:
public class NewDateController {
private ObservableList<String> data ;
public void setData(ObservableList<String> data) {
this.data = data ;
}
// other code as before...
// button handler:
#FXML
private void handleButtonPress() {
data.addItem("test");
}
}
Then in your ClientGUIController, load the fxml like this:
public void newDate() {
Stage newDate = new Stage();
Parent root;
try {
FXMLLoader loader = new FXMLLoader(getClass().getResource("newDate.fxml"));
root = loader.load();
NewDateController controller = loader.getController();
controller.setData(listItems);
} catch (IOException e) {
e.printStackTrace();
return;
}
Scene sceneNewDate = new Scene(root);
newDate.setTitle("Neuer Termin");
newDate.setScene(sceneNewDate);
newDate.show();
}