systemMonitorTask = TimeoutManager.getInstance()
                    .addTimeoutTarget(new SystemMonitorTarget(), ComponentUtil.getFessConfig().getThumbnailSystemMonitorIntervalAsInteger(),
                            true);

            final int totalCount = process(options);
            if (totalCount != 0) {
                logger.info("Processed {} thumbnail task(s).", totalCount);

            // Register mock FessConfig
            FessConfig mockConfig = new FessConfig.SimpleImpl() {
                @Override
                public Integer getThumbnailSystemMonitorIntervalAsInteger() {
                    return 60;
                }
            };
            ComponentUtil.register(mockConfig, "fessConfig");

            // Register mock ThumbnailManager

     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     * @throws NumberFormatException When the property is not integer.
     */
    Integer getThumbnailSystemMonitorIntervalAsInteger();

    /**
     * Get the value for the key 'user.code.request.parameter'. <br>
     * The value is, e.g. userCode <br>
     * comment: User code settings