public List<Enrolment> getActiveEnrollments(ExecutionYear executionYear) {
private List<Enrolment> getActiveEnrollments(ExecutionPeriod executionPeriod, Registration registration) {
    public List<Enrolment> getActiveEnrollments(ExecutionYear executionYear) {	List<Enrolment> results = new ArrayList<Enrolment>();	for (ExecutionPeriod executionPeriod : executionYear.getExecutionPeriods()) {	    results.addAll(getActiveEnrollments(executionPeriod));	}	return results;    }