final Disposable disposable = disposables.removeLast();
            try {
                disposable.dispose();
            } catch (final Throwable t) {
                t.printStackTrace(); // must not use Logger.
            }
        }
        disposables.clear();
        Introspector.flushCaches();
    }

    for (int i = 0; i < threadCount; i++) {
      executor.execute(() -> {
        try {
          drainQueue();
        } catch (Throwable e) {
          e.printStackTrace();
        }
      });
    }
    executor.shutdown();
  }

  private void drainQueue() throws Exception {
    for (HttpUrl url; (url = queue.take()) != null; ) {
      if (!fetchedUrls.add(url)) {

    @Override
    public String toString() {
        if (rootCause != null) {
            final StringWriter sw = new StringWriter();
            final PrintWriter pw = new PrintWriter(sw);
            rootCause.printStackTrace(pw);
            return super.toString() + "\n" + sw;
        }
        return super.toString();
    }

            Thread.sleep(10);
            sink.writeUtf8(String.format(" * %s = %s\n", i, factor(i)));
          }
          sink.close();
        } catch (IOException | InterruptedException e) {
          e.printStackTrace();
        }
      }

      private String factor(int n) {
        for (int i = 2; i < n; i++) {
          int x = n / i;
          if (x * i == n) return factor(x) + " × " + i;
        }

     * }
     * int dot = name.indexOf('.');
     * if (dot == -1)
     * break;
     * name = name.substring(dot + 1);
     * }
     * } catch (NamingException ne) {
     * if (log.level > 1)
     * ne.printStackTrace(log);
     * }
     *
     * throw uhe != null ? uhe : new UnknownHostException("invalid name");
     * }
     */

    Object addr;
    String calledName;

    /**

                dst[dstIndex] = (byte) '\0';
                dstIndex++;
            }
        } catch (final UnsupportedEncodingException uee) {
            if (LogStream.level > 1) {
                uee.printStackTrace(log);
            }
        }

        return dstIndex - start;
    }

    String readString(final byte[] src, final int srcIndex) {
        return readString(src, srcIndex, 256, useUnicode);

                            .error("Error: " + e.getMessage())
                            .build());
                    if (context.options().showErrors().orElse(false)) {
                        e.printStackTrace(context.terminal.writer());
                    }
                    return ERROR;
                }
            }
        }
    }

        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
        try (final StringWriter sw = new StringWriter(); final PrintWriter pw = new PrintWriter(sw)) {
            t.printStackTrace(pw);
            pw.flush();
            return systemHelper.abbreviateLongText(sw.toString());
        } catch (final IOException e) {
            logger.warn("Failed to print the stack trace {}", t.getMessage(), e);

        if (logger == null) {
            System.err.println(message);
            if (showStackTrace && e != null) {
                e.printStackTrace(System.err);
            }
            return;
        }
        if (showStackTrace) {
            logger.error(message, e);
        } else {
            logger.error(message);

      }
    } catch (e: Throwable) {
      if (KNOWN_FAILURES.contains(testData.toString())) {
        System.err.println("Ignoring known failure: $testData")
        e.printStackTrace()
      } else {
        throw e
      }
    }
  }

  private fun testHttpUrl(testData: WebPlatformUrlTestData) {
    val url =
      when (testData.base) {