two appenders logging to the same file with different levels and message patterns

[Alec Lebedev]

I have two pieces of code which I want to log messages to the same file,
but use different pattern format.

 

I created two RollingFileAppender  appenders, one - for each pattern
format. Both appenders log to the same file. Is this safe to do?

 

If this is safe to do, then let's assume that the first appender has
MaxFileSize 1MB and MaxBackupIndex of 10, another appender has
MaxFileSize 2MB and MaxBackupIndex of 20. How would the log file grow in
this case?

 

If this is not safe to do, then how can I have two pieces of code log
into the same file, but have different log levels and message patterns?

 

Thanks.

 

Alec