* @return {@link Logger}
     */
    public static synchronized Logger getLogger(final Class<?> clazz) {
        assertArgumentNotNull("clazz", clazz);

        if (!initialized) {
            initialize();
        }
        Logger logger = loggers.get(clazz);
        if (logger == null) {
            logger = new Logger(clazz);
            loggers.put(clazz, logger);
        }

    }

    public void test_rewrite_multiple_logger_names() {
        String[] loggerNames = { "test.logger", "another.logger", "third.logger" };
        ErrorToWarnRewritePolicy policy = new ErrorToWarnRewritePolicy(loggerNames);

        LogEvent event1 = Log4jLogEvent.newBuilder()
                .setLoggerName("test.logger.sub")
                .setLevel(Level.ERROR)
                .setMessage(new SimpleMessage("test message 1"))

                        if (logger.isDebugEnabled()) {
                            logger.debug("{} exists.", urlQueue.getUrl(), e);
                        }
                        return;
                    }
                    throw e;
                }
                if (logger.isDebugEnabled()) {
                    logger.debug("Storing child urls: {}", resultData.getChildUrlSet());

          if (!buffer.isProbablyUtf8()) {
            logger.log("")
            logger.log("<-- END HTTP (${totalMs}ms, binary ${buffer.size}-byte body omitted)")
            return response
          }

          if (contentLength != 0L) {
            logger.log("")
            logger.log(buffer.clone().readString(charset))
          }

          logger.log(
            buildString {

                responseParams.add(new Pair<>(tokenName, tokenValue));
                if (logger.isDebugEnabled()) {
                    logger.debug("Token: {}", tokenValue);
                }
            } else if (logger.isDebugEnabled()) {
                logger.debug("Token is not found.\n{}", content);
            }
        } catch (final IOException e) {

                    crawler.addExcludeFilter(urlValue);
                    if (logger.isInfoEnabled()) {
                        logger.info("Excluded URL from failures: {}", urlValue);
                    }
                });
            }

            if (logger.isDebugEnabled()) {
                logger.debug("Crawling {}", urlsStr);
            }

            crawler.setBackground(true);

                            if (logger.isDebugEnabled()) {
                                logger.debug("generator path: {}", filePath);
                            }
                            return filePath;
                        }
                    }
                }
                if (logger.isDebugEnabled()) {
                    logger.debug("generator path: {}", s);
                }

            }
        } catch (final MalformedURLException e) {
            logger.warn("Could not parse url: {}", filePath, e);
        }

        if (logger.isDebugEnabled()) {
            logger.debug("Processing SmbFile: {}", filePath);
        }

        try {
            if (file == null) {

        } catch (final ContainerNotAvailableException e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Crawler is stopped.", e);
            } else if (logger.isInfoEnabled()) {
                logger.info("Crawler is stopped.");
            }
            exitCode = Constants.EXIT_FAIL;
        } catch (final Throwable t) {
            logger.error("Crawler does not work correctly.", t);

            if (logger.isDebugEnabled()) {
                logger.debug("SuggestCreator is stopped.", e);
            } else if (logger.isInfoEnabled()) {
                logger.info("SuggestCreator is stopped.");
            }
            exitCode = Constants.EXIT_FAIL;
        } catch (final Throwable t) {
            logger.error("Suggest creator does not work correctly.", t);