Vaadin & Joda DateTime

I am using vaadin 6.6 and joda DateTime 1.6.2 I am using the solution described in How to use DateField with the Joda DateTime property?

The value is set / obtained correctly, but, unfortunately, I get a transition exception:

The exception is the throw inside the BeanValidationValidator:

the method is JodaDateTime and the value is java.util.Date JodaTime is not assigned from the date JodaTime does not have a row constructor

private Object convertValue (Object value)
        throws Property.ConversionException {
    // Try to assign the compatible value directly
    if (value == null
            || method.getType (). isAssignableFrom (value.getClass ())) {
        return value;
    } else {
        try {
            // Gets the string constructor
            final Constructor constr = method.getType (). getConstructor (
                    new Class [] {String.class});

            return constr.newInstance (new Object [] {value.toString ()});

        } catch (final java.lang.Exception e) {
            throw new Property.ConversionException (e);
        }
    }
}

Do you have some ideas?