logger.warn("Failed to create system properties file.", e);
            }
        }

        int totalCount = 0;
        int count = 1;
        final ExecutorService executorService = Executors.newFixedThreadPool(options.numOfThreads);
        try {
            while (count != 0) {
                count = ComponentUtil.getThumbnailManager().generate(executorService, options.cleanup);
                totalCount += count;

        executor = newFixedThreadPool(nThreads < 1 ? 1 : nThreads);
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        maxDeleteDocumentCacheSize = fessConfig.getIndexerDataMaxDeleteCacheSizeAsInteger();
        maxRedirectCount = fessConfig.getIndexerDataMaxRedirectCountAsInteger();
    }

    protected ExecutorService newFixedThreadPool(final int nThreads) {

            logger.debug("refreshToken: {}, authority: {}", refreshToken, authority);
        }
        ExecutorService service = null;
        try {
            service = Executors.newFixedThreadPool(1);
            final AuthenticationContext context = new AuthenticationContext(authority, true, service);
            final Future<AuthenticationResult> future =

                if (numThreads <= 0) {
                    numThreads = (Runtime.getRuntime().availableProcessors() * 3) / 2 + 1;
                }
                executorService = Executors.newFixedThreadPool(numThreads);
            }
        }
    }