commandThread.start();

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

            if (options.hotThread != null) {
                hotThreadMonitorTask = TimeoutManager.getInstance().addTimeoutTarget(new HotThreadMonitorTarget(), options.hotThread, true);

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

    /**
     * Get the value for the key 'crawler.hotthread.ignore_idle_threads'. <br>
     * The value is, e.g. true <br>