For example, the first time I run an application (or immediately after I clear out the /logs directory), I want log4j to write the application's logs to a file called log.0. Then, I exit the application and restart it, I want the logs to be written to log.1. And so on.
I would like to keep this in the configuration file, although if I can't, I guess I could always do it in my application, when log4j is set up.
Is this possible? If so, how?
Solution with log4j2:
Note OnStartupTriggeringPolicy and %i in filePattern. This way, Log4j will create new log file with index each time you run App.
Off the top of my head I don't think this is possible from with Log4j. Maybe when you shut the application down you could rename the .log file so next time you start up a new log file is created.
See logback's manual on uniquely named files (by timestamp).
May be this is what you are looking for
http://veerasundar.com/blog/2009/08/how-to-create-a-new-log-file-for-each-time-the-application-runs/
**Edit:**I got one more solution! But no idea whether it works or not,but you can try http://www.mail-archive.com/log4cxx-user@logging.apache.org/msg02132.html