code: public void marshall(RdsDbInstance rdsDbInstance, ProtocolMarshaller protocolMarshaller) {
  
          if (rdsDbInstance == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(rdsDbInstance.getRdsDbInstanceArn(), RDSDBINSTANCEARN_BINDING);
              protocolMarshaller.marshall(rdsDbInstance.getDbInstanceIdentifier(), DBINSTANCEIDENTIFIER_BINDING);
              protocolMarshaller.marshall(rdsDbInstance.getDbUser(), DBUSER_BINDING);
              protocolMarshaller.marshall(rdsDbInstance.getDbPassword(), DBPASSWORD_BINDING);
              protocolMarshaller.marshall(rdsDbInstance.getRegion(), REGION_BINDING);
              protocolMarshaller.marshall(rdsDbInstance.getAddress(), ADDRESS_BINDING);
              protocolMarshaller.marshall(rdsDbInstance.getEngine(), ENGINE_BINDING);
              protocolMarshaller.marshall(rdsDbInstance.getStackId(), STACKID_BINDING);
              protocolMarshaller.marshall(rdsDbInstance.getMissingOnRds(), MISSINGONRDS_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }
docs: Marshall the given parameter object.