Adding a appender to log4j at runtime

Hello,

I am new to the log4j package and have a need to add log files at runtime.   From looking through the documentation I see that all the logs are configured via a config file.   The app will have many users and I would like to create a log file for each user at runtime.  I won’t know in advance who the users are.

I thought that I could create a basic rotating file logger and then add appenders to it, but I don’t see a way via the javadocs to create an appender at runtime, just ways to get references to preconfigured appenders.

Is there a way to do this?   I guess I could create unique loggers from scratch via code each time a user logs on, but I liked being able to configure the root logger in the config file.  The way I understand the docs, a appender will inherit the attributes of the root logger.

Many thanks,
-Scott