docs: public void marshall(DescribeSessionsRequest describeSessionsRequest, ProtocolMarshaller protocolMarshaller) {
  
          if (describeSessionsRequest == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(describeSessionsRequest.getStackName(), STACKNAME_BINDING);
              protocolMarshaller.marshall(describeSessionsRequest.getFleetName(), FLEETNAME_BINDING);
              protocolMarshaller.marshall(describeSessionsRequest.getUserId(), USERID_BINDING);
              protocolMarshaller.marshall(describeSessionsRequest.getNextToken(), NEXTTOKEN_BINDING);
              protocolMarshaller.marshall(describeSessionsRequest.getLimit(), LIMIT_BINDING);
              protocolMarshaller.marshall(describeSessionsRequest.getAuthenticationType(), AUTHENTICATIONTYPE_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }