ServiceMonitoring.logService(UnEnrollStudentInGroup.class, userName, studentGroupCode);
StudentGroup studentGroup = FenixFramework.getDomainObject(studentGroupCode);
if (studentGroup == null) {
throw new InvalidSituationServiceException();
}
final List<String> emails = new ArrayList<String>();
final Collection<Person> people = new ArrayList<Person>();
for (final Attends attends : studentGroup.getAttendsSet()) {