code: public StreamList listStreams(String sessionId) throws OpenTokException {
          String streams = this.client.listStreams(sessionId);
          try {
              return streamListReader.readValue(streams);
          } catch (JsonProcessingException e) {
              throw new RequestException("Exception mapping json: " + e.getMessage());
          } catch (IOException e) {
              throw new RequestException("Exception mapping json: " + e.getMessage());
          }
      }
docs: Gets a list of {@link Stream} object for the given session ID.
  
  @param sessionId The session ID.
  
  @return The list of {@link Stream} objects.