<i18n dev> getCalendarInstance for Service Provider Interface

[Fiestas .Net]

Hello,

I made a SPI extension that implements Basque (eu_ES) locale at:

http://java-basque-locale.googlecode.com

One of the users of the extension has reported an issue about
Calendar.getCalendarInstance(basqueLocale) method. It happens that for
the Basque Locale I developed the calendar it returns has as the
firstDayOfTheWeek the Sunday, when it should be the Monday.

But I haven't found any abstract method to resolve the issue.

Is there any way to do it?

Thank you.