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https://issues.apache.org/jira/browse/LOG4J2-378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13764450#comment-13764450
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Ralph Goers commented on LOG4J2-378:
------------------------------------

To get the webapp name you could do

{code}
<appender type="FastFile" name="File" 
fileName="${sys:catalina.home}/logs/${web:servletContextName}.log">
{code}
                
> Logging generates file named ${sys on some systems
> --------------------------------------------------
>
>                 Key: LOG4J2-378
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-378
>             Project: Log4j 2
>          Issue Type: Bug
>    Affects Versions: 2.0-beta8
>         Environment: Issues occurs on Win7/64 system under Tomcat 7.0.42 / 
> Oracle JDK 1.7.0_25; fails to occur on RHEL 5.2 system under Tomcat 7.0.26 / 
> Oracle JDK 1.7.0_03
>            Reporter: Eric Schwarzenbach
>
> In a webapp I'm setting a system property in my apps ServletContextListener, 
> and using that system property in my log4j2.xml file, like so:
> {code}
> <appender type="FastFile" name="File" 
> fileName="${sys:catalina.home}/logs/${sys:application-name}.log">
> {code}
> On my Windows machine, a log file named "${sys." (always 0 bytes) is being 
> created instead of a log file with the application-name. The same war 
> deployed on one of our linux servers does not create a ${sys." file and 
> instead creates a log file with the intended application-name. 
> I should note that the files DO appear in the directory that 
> sys:catalina.home should resolve to. They appear elsewhere when I don't use 
> sys:catalina.home so I'm quite sure that this variable is resolving correctly 
> and it is the sys:application-name which is the problem.

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