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From "Scott Severtson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4J2-161) Using Log4J2 in Tomcat and WebApp results in all messages being sent to Tomcat's logger
Date Tue, 05 Feb 2013 22:13:12 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13571792#comment-13571792

Scott Severtson commented on LOG4J2-161:

FYI, there's no complied classes in the web app included in the Tomcat demo. Just a web.xml
file, an index.jsp file to invoke logging, and Log4J2 .jar files in WEB-INF/lib. We have also
confirmed that the problem exists in compiled class files, but went for the simplest demonstration
> Using Log4J2 in Tomcat and WebApp results in all messages being sent to Tomcat's logger
> ---------------------------------------------------------------------------------------
>                 Key: LOG4J2-161
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-161
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.0-beta4
>         Environment: Ubuntu 12.04 64bit: Java 1.6.0_38
> Solaris 10 u9 x64: Java 1.6.0_33
> Tomcat 6.0.29 and Tomcat 6.0.36
>            Reporter: Scott Severtson
>         Attachments: tomcat-6.0.36-log4j2.tar.gz
> We are experiencing difficulty getting web applications deployed under Tomcat 6.0.x to
honor per-app Log4J2 configuration, when Tomcat itself has been modified to also use Log4J2.
> I will attach a modified Tomcat archive with the following steps applied:
> 1. Download and decompress Tomcat 6.0.36
> 2. Follow steps #3 and #4 at https://tomcat.apache.org/tomcat-6.0-doc/logging.html#Using_Log4j
, but instead of using Log4J 1.x, use Log4J 2.0-beta4 core, api, and log4j-1.2 jars.
> 3. Deploy a web application to Tomcat which includes Log4J 2.0-beta4 .jar files, and
includes the following in web.xml:
>   	<context-param>
> 		<param-name>log4jConfiguration</param-name>
> 		<param-value>${log4j.app.configurationFile}</param-value>
> 	</context-param>
> 	<listener>
> 		<listener-class>org.apache.logging.log4j.core.web.Log4jContextListener</listener-class>
> 	</listener>
> 4. Create two Log4J2 configuration files, one for Tomcat and one for the web app. They
should use different PatternLayouts so output can be distinguished from each other.
> 5. Launch Tomcat, passing the following environment variable:
> CATALINA_OPTS="-Dlog4j.app.configurationFile=/path/to/log4j2-webapp.xml -Dlog4j.configurationFile=/path/to/log4j2-tomcat.xml"
> 6. Force the web app to generate a log message.
> 7. View Tomcat's catalina.out file, and observe messages from the web app are output
with Tomcat's configured PatternLayout.
> With the attached Tomcat archive, it's simplified to :
> 1. Unzip tomcat-6.0.36-log4j2.tar.gz
> 2. Set the CATALINA_OPTS environment variable to:
> CATALINA_OPTS="-Dlog4j.app.configurationFile=/path/to/tomcat-6.0.36/webapps/log4j2-tomcat/WEB-INF/log4j2.xml
> 3. Run the platform-appropriate startup.[sh|bat] file
> 4. Access http://localhost:8080/log4j2-tomcat/ in a web browser.
> /path/to/tomcat-6.0.36/logs/catalina.out will contain something like:
> TOMCAT: 16:53:09.065 INFO  org.apache.coyote.http11.Http11Protocol - Starting Coyote
HTTP/1.1 on http-8080
> TOMCAT: 16:53:09.096 INFO  org.apache.jk.common.ChannelSocket - JK: ajp13 listening on
> TOMCAT: 16:53:09.099 INFO  org.apache.jk.server.JkMain - Jk running ID=0 time=0/10  config=null
> TOMCAT: 16:53:09.100 INFO  org.apache.catalina.startup.Catalina - Server startup in 324
> TOMCAT: 16:53:23.617 WARN  JSP - App message 1
> The final message is from the web app, and *should* be prefixed with "APP" instead of
> We've run this process in a debugger, and can observe Log4J2 being initialized both by
Tomcat and the web app, with no errors. Still, for some reason the web application is using
Tomcat's configuration instead of the supplied app-specific config file.
> A mailing list suggestion was to only include Log4J2 core .jar in Tomcat (not in the
web app). However, at startup, we get the "SimpleLogger" error message from the web app, as
the Tomcat's version of the Log4J2 core .jar is hidden from the web app's classloader.
> We're at a loss. Due to Tomcat's architecture, we seemingly *must* include Log4J2 core
in both Tomcat and the web app. In a debugger, we can see both configuration files being loaded.
However, when the application sends log messages, they end up using Tomcat's configuration.

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