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https://issues.apache.org/jira/browse/LOG4J2-1841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15907071#comment-15907071
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Seweryn Habdank-Wojewodzki commented on LOG4J2-1841:
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We are using org.eclipse.jetty:jetty-webap:9.1.2.v20140210 it is pretty old,
but anyhow not that old like 6 or 7 :-).
As in the report we are using embedded Jetty, so we are attaching WAR to small
StartJetty class, which is starting Jetty "server".
StartJetty class has overridden withBuilder method, which uses
WebApplicationInitializer located in the WAR.
It is “simple” ;-).
> Problems with consequences after LOG4J2-248
> -------------------------------------------
>
> Key: LOG4J2-1841
> URL: https://issues.apache.org/jira/browse/LOG4J2-1841
> Project: Log4j 2
> Issue Type: Bug
> Components: Boot
> Affects Versions: 2.8
> Environment: Linux, Tomcat, WebApps
> Reporter: Seweryn Habdank-Wojewodzki
>
> Situation till Log4j v. 2.5 (including it):
> 1. One instance of embedded Jetty (programatically started) WITHOUT
> definition of the log4j.configurationFile variable.
> 2. WAR deployed on within this concrete instance of the embedded Jetty.
> 3. WAR internally contains own log4j2.xml file. So every Log4j instance,
> which is global for the WebApp, but local for the Jetty, will search and use
> configuration in own class path.
> Works in the way that every Web-App got own Log4j configuration and will
> operate according to own definitions (appenders, layouts, loggers).
> In the Log4j v. 2.6 and later in the same setup we are observing the
> following:
> Log4j in the applications are reporting problem that config file (log4j2.xml)
> is not visible. Thus we got message, that Log4j will switch to backup mode
> which will write only ERRORs in the console.
> We debuged that issue and found that change made in:
> https://issues.apache.org/jira/browse/LOG4J2-248
> seems to be the main reason.
> We cannot asses if this change was made only with respect to some PMD warning
> or it has as well some design considerations in background.
> The consequence is that Web Server instance shall define
> log4j.configurationFile variable, but also it means ALL WebApps within
> Application Container will use one single configuration, what makes
> definitely problem, as all WebApps providers must agree on ONE configuration
> including appenders configuration, message Layout and so on.
> Consider this report and provide solution (or workaround) or maybe just
> reasonable comment for the given system setup, please :-).
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