Griffon/JavaFX - Adding a change listener to a text field Part 2

gistfile1.groovy

import javafx.beans.value.ChangeListener
import javafx.beans.value.ObservableValue
import org.apache.commons.lang.StringUtils

// model
@FXBindable String amount1

// view
textField(id: 'amount1', text: bind(model.amount1Property))

noparent {
    amount1.textProperty().addListener({ ObservableValue<? extends String> observable, String oldValue, String newValue ->
        try {
            if (StringUtils.isNotBlank(newValue)) {
                Integer.parseInt(newValue);
            }
        } catch (Exception e) {
            observable.setValue(oldValue);
        }
    } as ChangeListener<String>)
}