How to change log4j setting during application run?

Question

Is it possible to change log4j settings during application execution?

Answer 1

You can use PropertyConfigurator.configureAndWatch to make log4j spawn a thread to periodically check your properties file for changes.

Alternatively, you can use JMX described in this post: Change Logging Levels using JMX

Answer 2

There ways of doing this by making your Log4j accessible through JMX and using a JMX console to control the filters, loggers, levels, appenders etc...

I have an example somewhere but I need to prune it a little to make it understandable. Would you want this ?