using log4j for clearing a file?

Question

im using log4j to write into a file with the following properties file :

log4j.rootLogger=DEBUG, FA

#File Appender
log4j.appender.FA=org.apache.log4j.FileAp         


        

Answer 1

You could do this:

log4j.appender.FA=org.apache.log4j.RollingFileAppender
log4j.appender.FA.MaxBackupIndex=1

And then in the startup code of the application:

((RollingFileAppender)Logger.getRootLogger().getAppender("FA")).rollOver()

That way, for each run of the program, the existing log is moved to "temp.ppr.1" and "temp.ppr" starts new. This way, you always have the log of the previous run as well.

Answer 2

I would suggest as part of your build tool (Apache Ant or Maven) to take care of clearing the file you don't want. Alternatively if you want to keep a backup you can use the RollingFileAppender

Answer 3

Have you tried just setting the append property on the FileAppender to false?

log4j.appender.FA.append=false