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https://issues.apache.org/jira/browse/LOG4J2-3372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17484740#comment-17484740
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Gary D. Gregory commented on LOG4J2-3372:
-----------------------------------------

Ah, right, and if you want this to work from an IDE, you'll need a default 
charset because {{sun.stdout.encoding}} and {{sun.stderr.encoding}} are only 
set from a OS console, at least on Windows 10: 
charset="${sys:sun.stdout.encoding:-UTF-8}"

> ConsoleAppender on Windows does not use platform default encoding
> -----------------------------------------------------------------
>
>                 Key: LOG4J2-3372
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-3372
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Appenders
>    Affects Versions: 2.17.1
>            Reporter: Oliver Matz
>            Priority: Minor
>         Attachments: ConsoleEncodingExample.java, LOG4J2-3372-sceenshot.png, 
> log4j2.xml
>
>
> The attached example outputs a short string containing non-ascii characters 
> ("Schöner Spaß") both to System.out and via log4j2 to a ConsoleAppender with 
> target SYSTEM_OUT.
> When I run the example in my IDE, it outputs the string correctly both times, 
> as expected
> However, if I run the example in a console on my Windows Desktop (10.0), only 
> the output to System.out is correct. The non-ascii-characters get broken in 
> the output of log4j2.
> I know that a workaround is to add {{charset="IBM850"}} in the 
> {{{}PatternLayout{}}}, but this clearly causes problems if the application 
> runs in a different environment.
> I definitely expect that log4j uses the platform default encoding, just as 
> System.out does, and this seems to be other peoples' expectation, too. See 
> e.g. LOG4J2-2929, stating incorrectly that "Currently PatternLayout always 
> uses the default charset if none is specified explicitly."
> Another workaround is, of course, to specify a certain encoding (e.g. UTF-8) 
> both for System.out and for the PatternLayout and to require the user to set 
> the windows codepage (using e.g. CHCP 65001). I dislike that approach because 
> it defeats the purpose of the "platform default encoding" and places a burden 
> on the user



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