synchronized (this) {
                    if (loadControlMonitorTask == null) {
                        final int interval = fessConfig.getLoadControlMonitorIntervalAsInteger();
                        loadControlMonitorTask =
                                TimeoutManager.getInstance().addTimeoutTarget(new LoadControlMonitorTarget(this), interval, 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 getLoadControlMonitorIntervalAsInteger();

    /**
     * Get the value for the key 'supported.uploaded.js.extentions'. <br>
     * The value is, e.g. js <br>
     * comment: Supported JavaScript file extensions for upload.