periodDAO.simpleLockWrite(period);
    private IPeriod createPeriod(final Calendar startDate, final Calendar endDate)            throws ExcepcaoPersistencia {        final IPeriod period = new Period();        period.setStartDate(startDate);        period.setEndDate(endDate);        period.setNextPeriod(null);        periodDAO.simpleLockWrite(period);        return period;    }