Well….
You would really be passing the name of the file to the Appender, not a Logger.
Loggers only reference Appenders so you can’t really configure them with
Appender configuration data. That said, Log4j 2 provides a few ways you could
do this:
1. Set a system property and reference it via ${sys:propertyName} in the
configuration. The manual has examples of this.
2. Create a custom Lookup Plugin and then register the file name with the
Lookup. Then reference it from the configuration as ${myLookup: key} where
myLookup is the name of your custom Lookup and key is the name that represents
the file name value.
3. Create a custom Configuration the extends XMLConfiguration or
JSONConfiguration. Pass the file name to that class and have it add that as a
property to the properties Map in the configuration. The XML could then just
reference it as ${propertyName}.
Ralph
On Aug 6, 2014, at 2:03 PM, Arwen Pond <[email protected]> wrote:
> My application takes a parameter where the user can specify the log file.
> I'd like to pass this parameter to the Logger which uses a FileAppender. I
> am not sure how to do this in log4j 2.
>
> Thanks,
> Arwen
>
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