JavaFX fx:id doesn´t create a Object in the controller class - javafx

Question

Hello I am new to JavaFX and have problems with the fx:id.
I get a null pointer exception in my controller class.
The objects apple and snake are not created, although the fx:id and declarations in the controller class match.
Can someone help me?
Main-Class:
public class Main extends Application {
private Controller controll = new Controller();
#Override
public void start(Stage primaryStage) {
try {
Parent root = FXMLLoader.load(getClass().getResource("World2.fxml"));
Scene scene = new Scene(root);
scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
scene.setOnKeyPressed(controll);
primaryStage.setScene(scene);
primaryStage.show();
} catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}
Controller-Class:
public class Controller implements EventHandler<Event> {
#FXML
private ImageView snake;
#FXML
private ImageView apple;
private int snakeRow = 8;
private int snakeColumn = 10;
private int appleRow = 5;
private int appleColumn = 5;
#Override
public void handle(Event ev) {
KeyEvent event = (KeyEvent) ev;
System.out.println("handle-Methode");
if (event.getCode() == KeyCode.LEFT && snakeColumn > 0) {
snakeColumn--;
System.out.println("Snake-ID: " + snake);
System.out.println("Apple-ID: " + apple);
}
}
FXML:
<ImageView fx:id="apple" fitHeight="39.0" fitWidth="44.0" pickOnBounds="true" GridPane.columnIndex="5" GridPane.rowIndex="5">
<image>
<Image url="#../img/icons8-apfel-48.png" />
</image>
</ImageView>
<ImageView fx:id="snake" fitHeight="36.0" fitWidth="44.0" pickOnBounds="true" GridPane.columnIndex="10" GridPane.rowIndex="8">
<image>
<Image url="#../img/icons8-hydra-48.png" />
</image>
</ImageView>

Answer 1

A controller instance is not associated with a scene unless
It's created by FXMLLoader based on the fx:controller attribute in the fxml. In this case you'd need to retrieve the controller instance from the FXMLLoader instance used to load the fxml after loading:
FXMLLoader loader = new FXMLLoader(getClass().getResource("World2.fxml"));
Parent root = loader.load();
Controller controll = loader.getController();
or
You don't specify the fx:controller attribute but pass a Object to FXMLLoader before loading that is to be used as controller for the scene:
FXMLLoader loader = new FXMLLoader(getClass().getResource("World2.fxml"));
loader.setController(controll);
Parent root = loader.load();