There is a JTextArea in SwingNode，When we click the up arrow, the focus not move into the textarea up line,but to the javafx component textFieldUser.

public class TestArrowKeyLostFocus extends Application {
    @Override
    public void start(Stage primaryStage) throws Exception {
        BorderPane borderPane = new BorderPane();
        HBox hBox = new HBox(5);
        Label labelServer = new Label("Server:");
        TextField textFieldServer = new TextField("http://100.0.6.162");

        Label labelUser = new Label("User:");
        TextField textFieldUser = new TextField("root");
        hBox.getChildren().addAll(labelServer, textFieldServer, labelUser, textFieldUser);
        borderPane.setTop(hBox);
        SwingNode swingNode = new SwingNode();
        createSwingContent(swingNode);
        borderPane.setCenter(swingNode);

        Scene scene = new Scene(borderPane, 1200, 800);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private void createSwingContent(final SwingNode swingNode) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                JPanel jPanel = new JPanel();
                BorderLayout borderLayout = new BorderLayout();
                jPanel.setLayout(borderLayout);
                JTextArea textArea = new JTextArea(200, 300);
                jPanel.add(textArea);
                swingNode.setContent(jPanel);
            }
        });
    }

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


Change the SwingNode's class SwingKeyEventHandler line 825
from:
if (event.getCode() == KeyCode.LEFT ||
                event.getCode() == KeyCode.RIGHT ||
                event.getCode() == KeyCode.TAB)
            {
                event.consume();
            }

to:
if (event.getCode() == KeyCode.LEFT ||
                event.getCode() == KeyCode.RIGHT ||
                event.getCode() == KeyCode.TAB ||
                event.getCode() == KeyCode.UP ||
                event.getCode() == KeyCode.DOWN)
            {
                event.consume();
            }
 will resolve it