docs: public Participant getParticipant(String sessionId, String participantPrivateId) throws OpenViduException {
  		Session session = sessions.get(sessionId);
  		if (session == null) {
  			throw new OpenViduException(Code.ROOM_NOT_FOUND_ERROR_CODE, "Session '" + sessionId + "' not found");
  		}
  		Participant participant = session.getParticipantByPrivateId(participantPrivateId);
  		if (participant == null) {
  			throw new OpenViduException(Code.USER_NOT_FOUND_ERROR_CODE,
  					"Participant '" + participantPrivateId + "' not found in session '" + sessionId + "'");
  		}
  		return participant;
  	}