Logback converters for username and sessions

SessionConverter.java

public class SessionConverter extends ClassicConverter {
    @Override
    public String convert(ILoggingEvent event) {
        RequestAttributes attrs = RequestContextHolder.getRequestAttributes();
        if (attrs != null) {
            return attrs.getSessionId();
        }
        return "NO_SESSION";
    }
}

UserConverter.java

public class UserConverter extends ClassicConverter {
    @Override
    public String convert(ILoggingEvent event) {
       Authentication auth = SecurityContextHolder.getContext().getAuthentication();
       if (auth != null) {
            return auth.getName();
       }
       return "NO_USER";
    }
}