logger appender

private FileAppender<ILoggingEvent> appenderLog;
private FileAppender<ILoggingEvent> appenderHtml;

private void startLog(File logFile) {
    logFile.getParentFile().mkdirs();

    LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();

    {
        appenderLog = new FileAppender<ILoggingEvent>();
        PatternLayoutEncoder encoder = new PatternLayoutEncoder();

        appenderLog.setContext(context);
        appenderLog.setFile(logFile.getPath() + ".log");
        appenderLog.setEncoder(encoder);

        encoder.setContext(context);
        encoder.setPattern("%date{yyyy-MM-dd HH:mm:ss.SSS} %-5level %42.42logger{42}:%-4.4line - %msg%n");
        encoder.start();

        context.getLogger(GenericImporter.class).addAppender(appenderLog);
        context.getLogger(InstanceCreator.class).addAppender(appenderLog);
        appenderLog.start();
    }

    {
        appenderHtml = new FileAppender<ILoggingEvent>();
        LayoutWrappingEncoder<ILoggingEvent> encoder = new LayoutWrappingEncoder<ILoggingEvent>();
        HTMLLayout layout = new HTMLLayout();

        appenderHtml.setContext(context);
        appenderHtml.setFile(logFile.getPath() + ".html");
        appenderHtml.setEncoder(encoder);

        encoder.setLayout(layout);
        encoder.setContext(context);
        encoder.start();

        layout.setContext(context);
        layout.setPattern("%date{yyyy-MM-dd HH:mm:ss.SSS}%level%logger%line%msg");
        layout.start();

        context.getLogger(GenericImporter.class).addAppender(appenderHtml);
        context.getLogger(InstanceCreator.class).addAppender(appenderHtml);
        appenderHtml.start();
    }
}

private void stoptLog() {
    appenderLog.stop();
    appenderHtml.stop();
}