[logback-user] [newbie] marker usage

Ceki Gülcü listid at qos.ch
Sat Feb 3 23:22:35 CET 2007

Hi Xavier,

Many thanks for your compliment. Would you care to create a bug report 
asking for an enhancement of the documentation as you describe in your 
email? You can do so under the logback-site/documentation heading [1].

The logback-demo [2] gives an example of how you could use markers.

In a nut shell, you mark logging request with a marker and those marked 
request can be filtered accordingly. For example, assume you marked a 
request as "TRACE" as shown below:

package ch.qos.logback.demo;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.Marker;
import org.slf4j.MarkerFactory;

public class MarkerExample {

   static Marker TRACE_MARKER = MarkerFactory.getMarker("TRACE");
   Logger logger = LoggerFactory.getLogger(MarkerExample .class);

   public void aMethod() {
     logger.info(TRACE_MARKER, "Hello world");


You can then instruct a turbo filter to drop requests marked with "TRACE" 
as follows:

<turboFilter class="ch.qos.logback.classic.turbo.MarkerFilter">

Does the above help?

[1] http://bugzilla.qos.ch/enter_bug.cgi?product=logback-site
[2] http://logback.qos.ch/demo.html

At 10:05 AM 2/3/2007, Xavier Hanin wrote:
>Hi All,
>I'm new to logback, I've read a good part of the documentation, and first 
>I should said that I'm impressed by the quality of the documentation and 
>the feature rich logging system you provide.
>Two things:
>Question: I have trouble to understand what is a Marker and what is the 
>use case behind them. Could you give me some insight?
>Remark: While reading the documentation I had the feeling that MDC was 
>introduced too late. Indeed, you reference MDC the first time in chapter 2 
>(as far as I can say), without giving even an hint on what it is. Several 
>other chapters reference this concept, but it's only in chapter 7 that I 
>understood what it is. Maybe adding a short introduction to this concept 
>(and the concept of Marker) in chapter 2 would help the reader?
>Thanks for your great work!
>Logback-user mailing list
>Logback-user at qos.ch

Ceki Gülcü
Logback: The reliable, generic, fast and flexible logging framework for Java.

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