throw newLinkageError(e);
      } catch (NoSuchMethodException e) {
        // Only introduced in Java 9.
        return null;
      }
    }

    private static LinkageError newLinkageError(Throwable cause) {
      return new LinkageError(cause.toString(), cause);
    }
  }

  private static final long serialVersionUID = 0L;

            } catch (Exception | LinkageError e) {
                logError("notify", e, eventSpy);
            }
        }
    }

    public void close() {
        if (eventSpies.isEmpty()) {
            return;
        }
        for (EventSpy eventSpy : eventSpies) {
            try {
                eventSpy.close();
            } catch (Exception | LinkageError e) {