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https://issues.apache.org/jira/browse/LOG4NET-558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15951990#comment-15951990
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Chris Bodolus commented on LOG4NET-558:
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Hmm, in 2.0.8, I tried {code}property{nonExistantKey}{code} in a layout pattern
matching yours and it printed _(null)_ in the logs. It then continued
processing the rest of the layout pattern fine. This was a singled-threaded
process. It looks like you have at least two loggers writing to the same file
- could you provide additional insight as to the setup or any additional
details that might help to reproduce?
> log4net 2.0.7 and greater doesn't log %message pattern
> ------------------------------------------------------
>
> Key: LOG4NET-558
> URL: https://issues.apache.org/jira/browse/LOG4NET-558
> Project: Log4net
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.0.7, 2.0.8
> Environment: Windows XP SP3 Home Edition
> Reporter: Varlamov Oleg
> Priority: Critical
> Fix For: 1.2.15
>
>
> When we are updated log4net from 1.2.15 to 2.0.7 some of our customers report
> about wrong logging in RollingFileAppender.
> Log file looks like:
> 2017-03-07 05:45:23,250 [1] WARN Driver [2017-03-07 05:45:32,718 [1] INFO
> Driver [2017-03-07 05:45:36,515 [1] INFO Driver [2017-03-07 05:45:37,843 [1]
> INFO Driver [2017-03-07 05:45:37,875 [1] INFO Driver [2017-03-07
> 05:45:38,125 [1] INFO WebcashClient [2017-03-07 05:45:40,828 [7] INFO
> Driver [2017-03-07 05:45:40,937 [7] INFO Driver [2017-03-07 05:45:41,093 [7]
> INFO Driver [2017-03-07 05:45:41,296 [7] INFO Driver [2017-03-07
> 05:45:41,328 [7] INFO Driver [2017-03-07 05:45:41,328 [7] INFO Driver
> [2017-03-07 05:45:41,343 [7] INFO Driver [2017-03-07 05:45:41,343 [7] INFO
> Driver [2017-03-07 05:45:41,375 [7] INFO Driver [2017-03-07 05:45:41,375 [7]
> INFO Driver [2017-03-07 05:45:41,531 [7] INFO Driver [2017-03-07
> 05:45:41,531 [7] INFO Driver [2017-03-07 05:45:41,562 [6] INFO Driver
> [2017-03-07 05:45:41,562 [6] INFO Driver [2017-03-07 05:45:41,578 [6] INFO
> Driver [2017-03-07 05:45:41,578 [6] INFO Driver [2017-03-07 05:45:41,593 [6]
> INFO Driver [2017-03-07 05:45:41,593 [6] INFO Driver [2017-03-07
> 05:45:41,609 [6] INFO Driver [2017-03-07 05:45:41,609 [6] INFO Driver
> [2017-03-07 05:45:41,625 [6] INFO Driver [2017-03-07 05:45:41,625 [6] INFO
> Driver [2017-03-07 05:45:41,640 [1] INFO WebcashClient [2017-03-07
> 05:45:41,781 [6] INFO Driver [2017-03-07 05:45:41,781 [6] INFO Driver
> [2017-03-07 05:45:41,859 [6] ...
> As I understood it can't handle "[%property{NDC}] - %message%newline" pattern.
> Appender configuration:
> <appender name="Driver" type="log4net.Appender.RollingFileAppender">
> <file value="Driver" />
> <appendToFile value="true" />
> <encoding value="utf-8" />
> <rollingStyle value="Date" />
> <datePattern value="_yyyy-MM-dd'.log'" />
> <layout type="log4net.Layout.PatternLayout">
> <conversionPattern value="%date [%thread] %-5level %logger
> [%property{NDC}] - %message%newline" />
> </layout>
> <threshold value="DEBUG" />
> </appender>
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