code: public void marshall(DescribeActivitiesRequest describeActivitiesRequest, ProtocolMarshaller protocolMarshaller) {
  
          if (describeActivitiesRequest == null) {
              throw new SdkClientException("Invalid argument passed to marshall(...)");
          }
  
          try {
              protocolMarshaller.marshall(describeActivitiesRequest.getAuthenticationToken(), AUTHENTICATIONTOKEN_BINDING);
              protocolMarshaller.marshall(describeActivitiesRequest.getStartTime(), STARTTIME_BINDING);
              protocolMarshaller.marshall(describeActivitiesRequest.getEndTime(), ENDTIME_BINDING);
              protocolMarshaller.marshall(describeActivitiesRequest.getOrganizationId(), ORGANIZATIONID_BINDING);
              protocolMarshaller.marshall(describeActivitiesRequest.getActivityTypes(), ACTIVITYTYPES_BINDING);
              protocolMarshaller.marshall(describeActivitiesRequest.getResourceId(), RESOURCEID_BINDING);
              protocolMarshaller.marshall(describeActivitiesRequest.getUserId(), USERID_BINDING);
              protocolMarshaller.marshall(describeActivitiesRequest.getIncludeIndirectActivities(), INCLUDEINDIRECTACTIVITIES_BINDING);
              protocolMarshaller.marshall(describeActivitiesRequest.getLimit(), LIMIT_BINDING);
              protocolMarshaller.marshall(describeActivitiesRequest.getMarker(), MARKER_BINDING);
          } catch (Exception e) {
              throw new SdkClientException("Unable to marshall request to JSON: " + e.getMessage(), e);
          }
      }
docs: Marshall the given parameter object.