The BaseConfiguration has an initial set of Lookups that are hardwired so that
some variable substitution is possible on the attributes on the Configuration
element. Until the packages attribute is handled custom lookups won't be found.
Your custom Lookups should work for other elements in the configuration. I'd
like to see your Lookup to see if it could be included as one of the hard-wired
plugins.
Ralph
On Aug 16, 2013, at 3:21 PM, David Nault 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.
>
> Thanks,
> David
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