Programmatically enabling log4j appenders

The standard way to enable 'appenders' in log4j is using log4j.properties file..Here lets check out how an user can enable the 'appenders' programmaticly..This is useful , when user wants a logging mechanism separately, which differs from his/her global logging setting..
This is a sample code i have written to grab proxy service level logging information separately..

    private void setLogger(ProxyService proxy) throws IOException {

        String filename = "logs/" + proxy.getName() + ".log";

        String datePattern = "yyyy-MM-dd";

        String SYSTEM_LOG_PATTERN = "[%d] %5p - %x %m {%c}%n";

        PatternLayout layout = new PatternLayout(SYSTEM_LOG_PATTERN);

        DailyRollingFileAppender appender = null;

        appender = new DailyRollingFileAppender(layout, filename, datePattern);

        Logger proxyLogger = Logger.getLogger("SERVICE_LOGGER." + proxy.getName());

        proxyLogger.setLevel((Level) Level.DEBUG);

        proxyLogger.setAdditivity(false);

        proxyLogger.addAppender(appender);

    }