Создание диалогового окна JavaFX внутри задачи JavaFX

Я пытаюсь создать диалоговое окно ввода javafx, я помещаю его в задачу, но мой код не создает никакого диалогового окна.

                Task<Void> passwordBox = new Task<Void>() {

                    @Override

                    protected Void call() throws Exception {

                TextInputDialog dialog = new TextInputDialog("walter");

                dialog.setTitle("Text Input Dialog");

                dialog.setHeaderText("Look, a Text Input Dialog");

                dialog.setContentText("Please enter your name:");



                // Traditional way to get the response value.

                Optional<String> result = dialog.showAndWait();

                if (result.isPresent()){

                    System.out.println("Your name: " + result.get());

                }



                // The Java 8 way to get the response value (with lambda expression).

                result.ifPresent(name -> System.out.println("Your name: " + name));

                return null;

                    }

                };

            Thread pt = new Thread(passwordBox);

            pt.start();

При отладке он собирается внутри следующего метода catch класса задач

catch (final Throwable th) {

                // Be sure to set the state after setting the cause of failure

                // so that developers handling the state change events have a

                // throwable to inspect when they get the FAILED state. Note

                // that the other way around is not important -- when a developer

                // observes the causeOfFailure is set to a non-null value, even

                // though the state has not yet been updated, he can infer that

                // it will be FAILED because it can be nothing other than FAILED

                // in that circumstance.

                task.runLater(() -> {

                    task._setException(th);

                    task.setState(State.FAILED);

                });

                // Some error occurred during the call (it might be

                // an exception (either runtime or checked), or it might

                // be an error. In any case, we capture the throwable,

                // record it as the causeOfFailure, and then rethrow. However

                // since the Callable interface requires that we throw an

                // Exception (not Throwable), we have to wrap the exception

                // if it is not already one.

                if (th instanceof Exception) {

                    throw (Exception) th;

                } else {

                    throw new Exception(th);

                }

Если я не помещаю диалоговое окно в задачу, это приводит к зависанию приложения.