Java 17: Issue with JavaFX SceneBuilder not updating UI after List changes
I'm writing unit tests and I'm dealing with Can someone help me understand I've searched everywhere and can't find a clear answer..... I'm working on a JavaFX application using Java 17, and I've run into a frustrating issue where changes to a `List` that backs my UI components through bindings do not reflect in the UI. After modifying the `List`, I expected the UI to update automatically, but it remains stale. Here's a simplified version of my code: ```java import javafx.application.Application; import javafx.collections.FXCollections; import javafx.collections.ObservableList; import javafx.scene.Scene; import javafx.scene.control.ListView; import javafx.scene.layout.VBox; import javafx.stage.Stage; public class MyApp extends Application { private ObservableList<String> items; @Override public void start(Stage primaryStage) { items = FXCollections.observableArrayList("Item 1", "Item 2"); ListView<String> listView = new ListView<>(items); VBox vbox = new VBox(listView); Scene scene = new Scene(vbox, 300, 250); primaryStage.setScene(scene); primaryStage.setTitle("List Example"); primaryStage.show(); // Simulate adding an item after a delay new Thread(() -> { try { Thread.sleep(2000); // Trying to modify the list on another thread items.add("Item 3"); } catch (InterruptedException e) { e.printStackTrace(); } }).start(); } public static void main(String[] args) { launch(args); } } ``` After running the application, I notice that the `ListView` is not updating to include "Item 3" after the sleep. I tried using `Platform.runLater()` to update the list, but that didn't seem to fix the issue. Here's what I attempted: ```java Platform.runLater(() -> items.add("Item 3")); ``` However, I still don't see the update reflected in the UI. Is there something I'm missing in terms of JavaFX threading or ObservableList behavior? How can I ensure that my UI updates correctly when the underlying data changes? Am I missing something obvious? I'm working in a macOS environment. Any ideas what could be causing this? This is my first time working with Java latest. Thanks in advance! This issue appeared after updating to Java 3.9. Any ideas how to fix this?