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Asked: 2026-06-07T23:12:40+00:00

I am attempting to use log4j to write CSV files. The CSV header must

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I am attempting to use log4j to write CSV files. The CSV header must be written to the top of a log file every time it is created. For example, all of these rolled files must have the following as the first line in the log file:

log.0 Timestamp, Name, min, max

log.1 Timestamp, Name, min, max

log.2 Timestamp, Name, min, max

Is it possible to determine when a rollover has occurred so that I can append the header?

Thanks.

P.S: I know there are lots of open source CSV writers but I prefer not to use them because I would like to use the existing log functionality in our software.

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1 Answer

  1. Editorial Team

    If you look at log4j documentation for RollingFileAppender, it has a method called rollOver.

    http://logging.apache.org/log4j/1.2/apidocs/index.html

    You would need to implement a custom file appender that inherits from RollingFileAppender, and override the rollOver method. I imagine you could just call super.rollOver, and then write whatever you want as a header to the new file before anything gets logged to it.

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