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https://issues.apache.org/jira/browse/LOG4J2-2110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16258635#comment-16258635
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Thomas Beauvais edited comment on LOG4J2-2110 at 11/19/17 9:44 PM:
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Tomcat is calling {{onStartup}} and if you look, the only thing that was
changed is giving the {{Log4jServletContextListener}} a reference to the
{{servletContext}} in order to call the cleanup on {{contextDestroyed}} which
doesn't happen in the current implementation since it's null.
We have tested this with a based web application w/ a custom appender on Tomcat
8.0, 8.5 and 9.0. All show that the {{onStartup}} is called, yet without
providing the servlet context to the listener (for later reference in the
aforementioned {{contextDestroyed}}). Also, by design, the
{{contextInitialized}} is never called. This is why you can see similar code
shared between the two classes.
was (Author: thomas.beauvais):
Tomcat is calling {{onStartup}} and if you look, the only thing that was
changed is getting the {{Log4jServletContextListener}} a reference to the
{{servletContext}} in order to call the cleanup on {{contextDestroyed}} which
doesn't happen in the current implementation since it's null.
We have tested this with a based web application w/ a custom appender on Tomcat
8.0, 8.5 and 9.0. All show that the {{onStartup}} is called, yet without
providing the servlet context to the listener (for later reference in the
aforementioned {{contextDestroyed}}). Also, by design, the
{{contextInitialized}} is never called. This is why you can see similar code
shared between the two classes.
> Log4jServletContextListener skips initialization and thusly never calls stop()
> ------------------------------------------------------------------------------
>
> Key: LOG4J2-2110
> URL: https://issues.apache.org/jira/browse/LOG4J2-2110
> Project: Log4j 2
> Issue Type: Bug
> Components: Web/Servlet
> Affects Versions: 2.8, 2.8.1, 2.8.2, 2.9.0, 2.9.1
> Reporter: Thomas Beauvais
> Priority: Critical
>
> {{Log4jServletContextListener}} is not working in Tomcat 8 or 8.5 as it's
> never initialized.
> The {{contextInitialized}} is never called and thus it never sets the
> {{servletContext}}.
> This is checked when a {{servletContext}} is destroyed and ignored every time.
> The outcome, is that our customer appenders are never stopped leading to
> resource leaks.
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