code: public void marshall(DescribeDirectConnectGatewayAssociationProposalsRequest describeDirectConnectGatewayAssociationProposalsRequest,
              ProtocolMarshaller protocolMarshaller) {
  
          if (describeDirectConnectGatewayAssociationProposalsRequest == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(describeDirectConnectGatewayAssociationProposalsRequest.getDirectConnectGatewayId(), DIRECTCONNECTGATEWAYID_BINDING);
              protocolMarshaller.marshall(describeDirectConnectGatewayAssociationProposalsRequest.getProposalId(), PROPOSALID_BINDING);
              protocolMarshaller.marshall(describeDirectConnectGatewayAssociationProposalsRequest.getAssociatedGatewayId(), ASSOCIATEDGATEWAYID_BINDING);
              protocolMarshaller.marshall(describeDirectConnectGatewayAssociationProposalsRequest.getMaxResults(), MAXRESULTS_BINDING);
              protocolMarshaller.marshall(describeDirectConnectGatewayAssociationProposalsRequest.getNextToken(), NEXTTOKEN_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }
docs: Marshall the given parameter object.