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From David Nault <david.na...@criticalpath.net>
Subject Re: BaseConfiguration ignores custom "Lookup" plugins?
Date Mon, 19 Aug 2013 20:04:13 GMT

On Aug 16, 2013, at 4:55 PM, Gary Gregory <garydgregory@gmail.com> wrote:

> On Fri, Aug 16, 2013 at 7:54 PM, Gary Gregory <garydgregory@gmail.com>wrote:
>> On Fri, Aug 16, 2013 at 6:21 PM, David Nault <david.nault@criticalpath.net
>>> wrote:
>>> Hi All,
>>> We're using Log4j in a webapp and are looking at migrating to Log4j 2.
>>> We'd like to continue writing our log files to a location under the
>>> webapp's context root -- that is, under the directory returned by
>>> ServletContext.getRealPath("/"). This works very well in our QA environment
>>> where multiple versions of the webapp are deployed to a single Tomcat
>>> server.
>>> I've written a Lookup plugin that maps "${web:rootDir}" to the desired
>>> path. The problem is that the plugin is ignored when parsing the config
>>> file, specifically the "filename" attribute of a "File" appender. The
>>> BaseConfiguration object seems to be using a StrSubstitutor with a default
>>> Interpolator that only knows about the "sys" and "env" prefixes.
>>> For what it's worth, the custom Lookup plugin works fine when used in a
>>> pattern layout string.
>>> Any thoughts on how to get the BaseConfiguration to use a custom Lookup
>>> plugin, or alternate ways to get the log files to appear under the webapp
>>> root? System properties aren't the solution since they are shared between
>>> webapps and we'd rather not return to the bad old days of using a different
>>> property for each webapp.
>>> Log4j 2 beta 8.
>> Any config item that is annotated with Log4j annotations has to be part of
>> Log4J's config dat file. I'm not not 100% sure, but I think you might have
>> to regenerate Log4J's config dat file. There might be a way to scan the CP
>> for additional code to scan...
> Also: This might be a nice add-on to Log4j if you're willing to contribute
> it ;)
> Gary

Thanks Gary. I've filed LOG4J2-364 and contributed what I've got so far.

Regarding scanning the class path for plugins, I thought I had taken care of this by executing
the following line in a ServletContextListener that runs before Log4j:


This doesn't seem to have an effect though, since BaseConfiguration doesn't use the PluginManager
to create it's initial list of Lookup implementations.


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