if (space == null) { throw new DomainException("error.inexistente.space");
if (begin == null) { throw new DomainException("error.personSpaceOccupation.no.beginDate");
    private void checkParameters(final Space space, final Person person, YearMonthDay begin,	    YearMonthDay end) {	if (person == null) {	    throw new DomainException("error.inexistente.person");	}	if (space == null) {	    throw new DomainException("error.inexistente.space");	}	checkPersonSpaceOccupationIntersection(begin, end, person, space);    }