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From Gary Gregory <garydgreg...@gmail.com>
Subject Re: Set the file name based on command line args
Date Wed, 06 Aug 2014 23:09:30 GMT
I wonder if we could write a "MainArgumentsLookup" that finds the main
thread and walks up the stack to the public static main(String[]) main
methods and gets the arguments from the stack...


On Wed, Aug 6, 2014 at 6:54 PM, Ralph Goers <ralph.goers@dslextreme.com>

> 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 <apond@book.com> 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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