Invocation target Exception in Construtor - JavaFx

Question

I am building a javafx project in which I am facing some problems listed below.

First, I was getting a NullPointerException when i was not initializing the 2 classes in constructor sfc = new ServerFrameController(); & sf = new ServerFrame(); .Even after searching for hours, I was not able to figure out the cause for the null pointer exception. Then i thought maybe initializing the classes might help. But After adding these two lines I am getting InvocationTargetException . Please help!!

Exception:

Exception in Application constructor
java.lang.reflect.InvocationTargetException  
Caused by: java.lang.StackOverflowError  
    at com.socket.ServerFrameController.<init>(ServerFrameController.java:35)  
    at com.socket.ServerFrame.<init>(ServerFrame.java:28)  

Class 1:

public class ServerFrame extends Application {

    public ServerFrameController sfc;
    public SocketServer server;
    public Thread serverThread;
    public String filePath = "D:\\Data.xml";
    public JFileChooser fileChooser;
    public JFXPanel fxPanel;

    public ServerFrame() {
        sfc = new ServerFrameController();
        fxPanel = new JFXPanel();
        fxPanel.setVisible(true);
        fileChooser = new JFileChooser();
    }
    // Some More Code.....
}

Class 2:

public class ServerFrameController implements Initializable {

    ServerFrame sf;
    @FXML
    public TextField jTextField3;
    @FXML
    public Button jButton2;
    @FXML
    public Button jButton1;
    @FXML
    public TextArea jTextArea1;

    public ServerFrameController() {
        sf = new ServerFrame();
    }
}

Answer 1

You can avoid the issue of StackOverflowError by passing a reference to the ServerFrame to the controller, but in general it is bad practice to pass a reference of this from within the constructor.

public class ServerFrameController implements Initializable {

    ServerFrame sf;
    @FXML
    public TextField jTextField3;
    @FXML
    public Button jButton2;
    @FXML
    public Button jButton1;
    @FXML
    public TextArea jTextArea1;

    public ServerFrameController(ServerFrame sf) {
        this.sf = sf;
    }
}
public class ServerFrame extends Application {

    public ServerFrameController sfc;
    public SocketServer server;
    public Thread serverThread;
    public String filePath = "D:\\Data.xml";
    public JFileChooser fileChooser;
    public JFXPanel fxPanel;

    public ServerFrame() {
        sfc = new ServerFrameController(this);
        fxPanel = new JFXPanel();
        fxPanel.setVisible(true);
        fileChooser = new JFileChooser();
    }
    // Some More Code.....
}

Best would probably be to figure out the NullPointerException and find the proper solution for that. I would guess that is is somehow related to the order everything is initialized.