docs: public DescribeEventDetailsResult withSuccessfulSet(EventDetails... successfulSet) {
          if (this.successfulSet == null) {
              setSuccessfulSet(new java.util.ArrayList<EventDetails>(successfulSet.length));
          }
          for (EventDetails ele : successfulSet) {
              this.successfulSet.add(ele);
          }
          return this;
      }