JavaFX Controller is removed by garbage collector while the fxml file is still shown

App.java

package org.example;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class App extends Application {

	public static void main(String[] args) {
		launch(args);
	}


	@Override
	public void start(Stage primaryStage) throws Exception {
		FXMLLoader fxmlLoader = new FXMLLoader(this.getClass().getResource("/Test.fxml"));

		Parent load = fxmlLoader.load();

		primaryStage.setScene(new Scene(load));
		primaryStage.show();
	}
}

MyView.java

package org.example;

import javafx.beans.binding.Bindings;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ToggleButton;

public class MyView {

	@FXML
	public ToggleButton togglebutton;
	@FXML
	public Label label;
	@FXML
	public Button gcButton;

	private MyViewModel viewModel = new MyViewModel();

	public void initialize() {
		label.textProperty().bind(Bindings.concat("Selected: ", togglebutton.selectedProperty()));

		togglebutton.selectedProperty().addListener((observable, oldValue, newValue) -> System.out.println("togglebutton"));

		viewModel.selectedProperty().bindBidirectional(togglebutton.selectedProperty());


		gcButton.setOnAction(e -> {
			System.gc();
		});
	}
}

MyViewModel.java

package org.example;

import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;

public class MyViewModel {

	private BooleanProperty selected = new SimpleBooleanProperty();

	public MyViewModel() {
		selected.addListener((observable, oldValue, newValue) -> System.out.println("viewModel"));
	}

	public BooleanProperty selectedProperty() {
		return selected;
	}
}

Test.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.Separator?>
<?import javafx.scene.control.ToggleButton?>
<?import javafx.scene.layout.VBox?>

<VBox maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" spacing="10.0" xmlns="http://javafx.com/javafx/8.0.65" xmlns:fx="http://javafx.com/fxml/1" fx:controller="org.example.MyView">
   <children>
      <Label fx:id="label" text="Label" />
      <ToggleButton fx:id="togglebutton" mnemonicParsing="false" text="ToggleButton" />
      <Separator prefWidth="200.0" />
      <Button mnemonicParsing="false" fx:id="gcButton" text="Run GC" />
   </children>
   <padding>
      <Insets bottom="20.0" left="20.0" right="20.0" top="20.0" />
   </padding>
</VBox>