How to configure log4j to only keep log files for the last seven days?

Question

I have the following logging problem with several Java applications using log4j for logging:

I want log files to be rotated daily, like

Answer 1

The class DailyRollingFileAppender uses the DatePattern option to specify the rolling schedule. This pattern should follow the SimpleDateFormat conventions from Std. Ed. v1.4.2. So, we have to use E option (Day in week). For example:

See more about DailyRollingFileAppender class from log4j javadoc here. Unfortunately the Java 1.4.2 documentation is no longer online, but you can download a copy here.