Clear rotated logs on startup in log4j using RollingFileAppender

Posted on 2010-08-20
Last Modified: 2012-05-10
I have my log4j config set up with MaxBackupIndex=1.  When I close down the app then bring it up, it clears the main log file (which is what I want), but does not delete any rolled files from the previous run (this is what I want to change).

For example, if the log file is gui.log and I close the gui when gui.log and gui.log.1 exist, then I bring up the GUI again, I want gui.log cleared (which is happening) and gui.log.1 deleted (what I'm trying to figure out how to do).

Any suggestions would be most appreciated.  Thanks!
Question by:stev0931
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LVL 86

Assisted Solution

CEHJ earned 200 total points
ID: 33485465
You might need something custom for that

Author Comment

ID: 33485958
Doing something custom is always an option, but I'd prefer to use something via the log4j API first for reduced system fragility.
LVL 16

Expert Comment

ID: 33486456
try to set parameter Append to false. I think that it will erase the old files too...?!
If you don't want old files, then set MaxBackupIndex=0
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Author Comment

ID: 33486522
Setting append to false results in the main log file (e.g. gui.log) being cleared at startup.  Unfortunately, it does not impact the gui.log.1.  Setting MaxBackupIndex to 0 will get me no log rolling at all.  I need to have log rolling - I just need to delete old rolled logs on application startup.
LVL 92

Accepted Solution

objects earned 300 total points
ID: 33490086
log4j only manages the file it is currently logging to.
Usual practice is to manage logs externally to log4j eg. using cron or doing it in your startup script.
LVL 86

Expert Comment

ID: 33490646
There is no ready made way that log4j does this, but you could use a custom Configurator

Author Closing Comment

ID: 33491530
Thanks!  Not what I wanted to hear, but sometimes the answer just works out that way ;)

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