docs: public Set<Participant> getParticipants(String sessionId) throws OpenViduException {
  		Session session = sessions.get(sessionId);
  		if (session == null) {
  			throw new OpenViduException(Code.ROOM_NOT_FOUND_ERROR_CODE, "Session '" + sessionId + "' not found");
  		}
  		Set<Participant> participants = session.getParticipants();
  		participants.removeIf(p -> p.isClosed());
  		return participants;
  	}