code: public void marshall(GameSessionPlacement gameSessionPlacement, ProtocolMarshaller protocolMarshaller) {
  
          if (gameSessionPlacement == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(gameSessionPlacement.getPlacementId(), PLACEMENTID_BINDING);
              protocolMarshaller.marshall(gameSessionPlacement.getGameSessionQueueName(), GAMESESSIONQUEUENAME_BINDING);
              protocolMarshaller.marshall(gameSessionPlacement.getStatus(), STATUS_BINDING);
              protocolMarshaller.marshall(gameSessionPlacement.getGameProperties(), GAMEPROPERTIES_BINDING);
              protocolMarshaller.marshall(gameSessionPlacement.getMaximumPlayerSessionCount(), MAXIMUMPLAYERSESSIONCOUNT_BINDING);
              protocolMarshaller.marshall(gameSessionPlacement.getGameSessionName(), GAMESESSIONNAME_BINDING);
              protocolMarshaller.marshall(gameSessionPlacement.getGameSessionId(), GAMESESSIONID_BINDING);
              protocolMarshaller.marshall(gameSessionPlacement.getGameSessionArn(), GAMESESSIONARN_BINDING);
              protocolMarshaller.marshall(gameSessionPlacement.getGameSessionRegion(), GAMESESSIONREGION_BINDING);
              protocolMarshaller.marshall(gameSessionPlacement.getPlayerLatencies(), PLAYERLATENCIES_BINDING);
              protocolMarshaller.marshall(gameSessionPlacement.getStartTime(), STARTTIME_BINDING);
              protocolMarshaller.marshall(gameSessionPlacement.getEndTime(), ENDTIME_BINDING);
              protocolMarshaller.marshall(gameSessionPlacement.getIpAddress(), IPADDRESS_BINDING);
              protocolMarshaller.marshall(gameSessionPlacement.getPort(), PORT_BINDING);
              protocolMarshaller.marshall(gameSessionPlacement.getPlacedPlayerSessions(), PLACEDPLAYERSESSIONS_BINDING);
              protocolMarshaller.marshall(gameSessionPlacement.getGameSessionData(), GAMESESSIONDATA_BINDING);
              protocolMarshaller.marshall(gameSessionPlacement.getMatchmakerData(), MATCHMAKERDATA_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }
docs: Marshall the given parameter object.