docs: public void marshall(InstanceEntry instanceEntry, ProtocolMarshaller protocolMarshaller) {
  
          if (instanceEntry == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(instanceEntry.getSourceName(), SOURCENAME_BINDING);
              protocolMarshaller.marshall(instanceEntry.getInstanceType(), INSTANCETYPE_BINDING);
              protocolMarshaller.marshall(instanceEntry.getPortInfoSource(), PORTINFOSOURCE_BINDING);
              protocolMarshaller.marshall(instanceEntry.getUserData(), USERDATA_BINDING);
              protocolMarshaller.marshall(instanceEntry.getAvailabilityZone(), AVAILABILITYZONE_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }