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From Scott Deboy <scott.de...@gmail.com>
Subject Re: Filter log based on package when using getLogger(String)
Date Wed, 18 Jul 2012 17:54:30 GMT
You can use filters, including the ExpressionFilter, to build pretty much
arbitrary expressions and filter appenders using that, but it requires you
to use a log4j.xml configuration file.

Something like this (requires you to have the 'extras' companion in your

                <filter class="org.apache.log4j.filter.ExpressionFilter">
                                <param name="Expression" value="MSG ~=
                                <param name="AcceptOnMatch" value="false"/>

On Wed, Jul 18, 2012 at 10:26 AM, Charles Hache <chache@tsco.ca> wrote:

> Hello folks,
> Most of my loggers are constructed with the Logger.getLogger(String)
> function, so that I can have loggers like "Device(#3, Some Description)"
> instead of "ca.something.package.Device" with the goal of being able to
> more easily identify which instances are writing what log lines.
> I've found that when I do this I can't use properties to filter the log
> level, such as
> log4j.logger.ca.something.**package=INFO
> I figure this is because if I use getLogger(Device.class) it gets the
> package of the logger from the class I give it and it all works from there.
> So this all makes sense, but brings up two questions:
> Can I still declare my loggers with a String name (getLogger(String)) and
> somehow still use package-style log level selection in the properties file?
> If not, do you guys have any tips on how to differentiate between
> instances when they're logging?  The obvious solution would be to prepend
> any log message I want to write with a description of the instance, but
> that seems like a lot of extra work.
> I think really what I'm looking for is something like getLogger(Class
> theClass, String theName), but maybe there is an already-implemented way to
> do this.
> Any tips?
> Regards,
> Charles
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