Caused by: java.lang.RuntimeException: A bound value cannot be set.
at javafx.scene.control.TextInputControl$TextProperty.set(TextInputControl.java:971)
at javafx.scene.control.TextInputControl.setText(TextInputControl.java:193)

//code
@Override
    public void start(Stage stage) throws Exception {
        final ComboBox cb = new ComboBox();
        final TextField tf = new TextField();
        
        cb.setEditable(true);
        
        Button btnBind = new Button("1. Bind text field");
        btnBind.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent t) {
                cb.getEditor().textProperty().bind(tf.textProperty());
            }
        });
        
        Button btn = new Button("2. Set value");
        btn.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent t) {
                cb.setValue(1);
            }
        });
        
        VBox vb = new VBox(10.);
        vb.getChildren().addAll(cb, tf, btnBind, btn);
        
        Scene scene = new Scene(vb, 200, 300);
        
        stage.setTitle("Bug");
        stage.setScene(scene);
        stage.show();
    }

click button 1. Bind text field
type any text in text field
click button 2. Set value