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How do I call back to the main node so I can switch to a different scene in javafx

so I am trying to switch to a different scene in javafx. I am working on a project where the user will select on a food category via a combobox, which will switch to a new scene that has all the recipes under that specific category.
The problem is I am able to load my MainMenuScene, but I am not sure how to switch to a different scene, which I think is because of how I have structured my code.
My code is structured where I can GUIAPP (which starts the entire GUI)
private static View myView;
private static Recipe myRecipe;
public GUIApp() {
myView = new View();
myRecipe = new Recipe();
}
public static View getView() {
return myView;
}
public static Recipe getRecipe() {
return myRecipe;
}
#Override
public void start(Stage primaryStage) throws Exception {
System.out.println("Starting app...");
myView.setStage(primaryStage);
}
public static void main(String [] args) {
myRecipe = new Recipe();
launch(args);
}
}
Then View, which sets the primary Stage (which is MainMenuScene)
private Stage myStage;
private Scene myMainMenuScene;
private Scene myMealScene;
public View() {
myMainMenuScene = new MainMenuScene(new BorderPane());
}
public Stage getStage() {
return myStage;
}
public Scene getMealScene() {
return myMealScene;
}
public void setStage(Stage primaryStage) {
myStage = primaryStage;
myStage.setScene(myMainMenuScene);
myStage.setTitle("Recipe Database");
myStage.setWidth(600);
myStage.setHeight(400);
Scene scene = myMainMenuScene;
myStage.setScene(scene);
myStage.show();
}
}
Here is MainMenuScene, where it calls the recipe code I had previously made
private BorderPane myRoot;
private String f, t;
Label label = new Label();
public MainMenuScene(Parent root) {
super(root);
myRoot = (BorderPane) root;
BorderPane titleBox = new BorderPane();
titleBox.setStyle("-fx-font: 24 arial;");
myRoot.setTop(titleBox);
Text title = new Text("Recipe Database Tool");
title.setFont(new Font(50));
titleBox.setCenter(title);
//VBox and HBox creation
VBox leftBox = new VBox();
VBox rightBox = new VBox();
VBox centerBox = new VBox();
//Button search = new Button("Recipe Categories");
Button create = new Button("Create/Upload a New Recipe");
//Creates a combobox that gets the category name from Recipe
ComboBox<String> search = new ComboBox<String>();
search.getItems().addAll(GUIApp.getRecipe().getCategory());
search.setOnAction((e) -> {
search.getSelectionModel().selectFirst();
});
/*
****//Create a button that switches to MealScene when a category is selected
Button select = new Button("Select");
select.setOnAction((e) -> {
View.getStage().setScene(View.getMealScene());****
});
*/
//myRoot for each Box
myRoot.setLeft(leftBox);
myRoot.setRight(rightBox);
myRoot.setCenter(centerBox);
//adding the search categories button to the left box
leftBox.setAlignment(Pos.CENTER);
leftBox.setSpacing(30);
leftBox.getChildren().add(search);
//adding the create a new recipe to the right box
rightBox.setAlignment(Pos.CENTER);
rightBox.setSpacing(30);
rightBox.getChildren().add(create);
}
}
I tried calling the button by using View, but I am getting an error that I am not sure how to fix.
Here's the error: It's asking for View.getStage() to make getStage a static method in View, which I don't want to do and View.getMealScene to also become static
Please let me know! I would love to learn how to prevent this in the future

Passing parameter from a popup Scene with its own controllers to a main controller JavaFX

User clicks on a button that opens a popup second scene that allows the user to select some values, then close and pass the selection to the first scene.
First Controller
Set<String> set;
public void initialize(URL url, ResourceBundle rb){
set = new TreeSet<String>():
}
#FXML
public Set<String> addValue (MouseEvent e) throws IOException {
Stage stage = new Stage ();
root = FXMLoader.load(getClass).getResources(2ndFXML.fxml);
stage.initModality(Modality.APPLICATION_MODAL);
stage.iniOwner(clickedButton.getScene().getWindow();
stage.showAndWait():
return set;
}
2nd Controller
#FXML
public void addSelection (MouseEvent e) throws IOException {
if (event.getSource() == button){
stage = (Stage) button.getScene().getWindow();
set.addAll(listSelection)
stage.close
}
But the value never makes it back to the first controller.

Since you're using showAndWait(), all you need to do is define an accessor method for the data in the second controller:
public class SecondController {
private final Set<String> selectedData = new TreeSet<>();
public Set<String> getSelectedData() {
return selectedData ;
}
#FXML
private void addSelection (MouseEvent e) {
// it almost never makes sense to define an event handler on a button, btw
// and it rarely makes sense to test the source of the event
if (event.getSource() == button){
stage = (Stage) button.getScene().getWindow();
selectedData.addAll(listSelection)
stage.close();
}
}
}
Then retrieve it in the first controller when the window has been closed:
#FXML
public void addValue(MouseEvent e) throws IOException {
Stage stage = new Stage ();
FXMLLoader loader = new FXMLLoader(getClass().getResource(2ndFXML.fxml));
Parent root = loader.load();
// I guess you forgot this line????
stage.setScene(new Scene(root));
stage.initModality(Modality.APPLICATION_MODAL);
stage.iniOwner(clickedButton.getScene().getWindow();
stage.showAndWait();
SecondController secondController = loader.getController();
Set<String> selectedData = secondController.getSelectedData();
// do whatever you need to do with the data...
}

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 Treeview shows no items

I try to implement an TreeView in my JavaFX App. But unfortenatly no items are showed, but i cannot find an issue. I search for some example and did it like them.
I put an TreeView Control to my FXML File in SceneBuilder and selected the ControllerClass which was generated and slected the Treeview field from this class as an id for the TreeView Control in SceneBuilder.
That's my Controller code:
public class MainSceneController implements Initializable {
#FXML
TreeView<String> treeview;
#FXML
Button btn;
#Override
public void initialize(URL url, ResourceBundle rb) {
TreeItem<String> root = new TreeItem<>("root");
for(int i = 0; i < 10; i++) {
TreeItem<String> child = new TreeItem<>("Children " + i);
root.getChildren().add(child);
}
root.setExpanded(true);
this.treeview = new TreeView<>(root);
treeview.getSelectionModel().setSelectionMode(SelectionMode.SINGLE);
}
#FXML
public void addTreeViewItem() {
}
#FXML
private void showAddStreamDialog() {
try {
Parent p;
p = FXMLLoader.load(getClass().getResource("AddStream.fxml"));
Scene s = new Scene(p);
Stage stage = new Stage();
stage.initModality(Modality.APPLICATION_MODAL);
stage.setScene(s);
stage.show();
} catch (IOException ex) {
Logger.getLogger(MainSceneController.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
Any idea's whats wrong?

You shouldn't assign new instance to the this.treeview because this field was already initialized by the FXLoader.
So instead of this.treeview = new TreeView<>(root); you need simply to set the root item this.treeview.setRoot(root);

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();
}