Question

I want to add line numbers (just a sequential integer that keeps incrementing on each log line) to my logback config – how do I do that? I looked through the properties available in the docs but i couldn’t see it anywhere. What am I missing?

Answer 1

As Peter mentioned, writing a custom conversion specifier is your best option at the moment (June 2012). Here is sample code:

import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.classic.pattern.ClassicConverter ;
import java.util.concurrent.atomic.AtomicLong;

public class LocalSequenceNumberConverter extends ClassicConverter {

  AtomicLong sequenceNumber = new AtomicLong(0);

  @Override
  public String convert(ILoggingEvent event) {
    return Long.toString(sequenceNumber.getAndIncrement());
  }
}

Please post on the logback-user mailing if you need further help.