*            例外
     */
    public void log(final LogMessage logMessage, final Throwable throwable) {
        assertArgumentNotNull("logMessage", logMessage);

        final LogLevel level = logMessage.getLevel();
        if (isEnabledFor(level)) {
            final String message = logMessage.getMessage();
            switch (level) {
            case DEBUG:
                log.debug(message, throwable);

        for (final String name : loggerNames) {
            if (loggerName.startsWith(name)) {
                final Level sourceLevel = event.getLevel();
                if (sourceLevel != Level.ERROR) {
                    return event;
                }
                return new Log4jLogEvent.Builder(event).setLevel(Level.WARN).build();
            }
        }
        return event;
    }

    @PluginFactory

        split(ComponentUtil.getFessConfig().getLoggingAppPackages(), ",")
                .of(stream -> stream.map(String::trim).filter(StringUtil::isNotEmpty).forEach(s -> Configurator.setLevel(s, logLevel)));
    }

    public String getLogLevel() {
        return System.getProperty(Constants.FESS_LOG_LEVEL, Level.WARN.toString());
    }