Java Fx: bidirectional bindings of different properties

Question

I just tried to bind a Integer and a String property. After some googling this should be possible with one of the two provided methods:
1. public static void bindBidirectional(Property stringProperty, Property otherProperty, StringConverter converter)
2. public static void bindBidirectional(Property stringProperty, Property otherProperty, java.text.Format format)
Unluckily this does not seem to work for me. What am I doing wrong?
import java.text.Format;
import javafx.beans.binding.Bindings;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.util.converter.IntegerStringConverter;
public class BiderectionalBinding {
    public static void main(String[] args) {
        SimpleIntegerProperty intProp = new SimpleIntegerProperty();
        SimpleStringProperty textProp = new SimpleStringProperty();
        Bindings.bindBidirectional(textProp, intProp, new IntegerStringConverter());
        intProp.set(2);
        System.out.println(textProp);
        textProp.set("8");
        System.out.println(intProp);   
}

Answer 1

Hi. Try this:
        Bindings.bindBidirectional(textProp, intProp, new StringConverter<Number>() {
            @Override
            public String toString(Number number) {
                return number.toString();
            @Override
            public Number fromString(String string) {
                return Integer.parseInt(string);
);