As reported by the user, Mastering FXML tutorial at http://docs.oracle.com/javafx/2/fxml_get_started/fxml_tutorial_intermediate.htm contains unused code:
Some code to delete from Example 4-5 Person Class.
public String getPrimary() {
        return getEmail();
    }
    
    public String getSecondary() {
        return getEmail();
    }