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https://issues.apache.org/jira/browse/LOG4J2-1185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15964827#comment-15964827
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Juan Loman commented on LOG4J2-1185:
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I haven't been able to make this work in 2.8.2 (latest release as of this
comment). Which kind of pattern should be used in the `fileName` property?
I've tried with:
* {{fileName="logs/current.$\{date:yyyy-MM-dd-HH-mm\}.log"}}: Creates the
filename correctly, but it is not updated afterwards.
* {{fileName="logs/current.$$\{date:yyyy-MM-dd-HH-mm\}.log"}}: Creates a file
literally named: {{current.$\{date/yyyy-MM-dd-HH-mm\}.log}}.
* {{fileName="logs/current.%d\{yyyy-MM-dd-HH-mm\}.log"}}: Creates a file
literally named: {{current.%d\{yyyy-MM-dd-HH-mm\}.log}}.
This should be described briefly in the official documentation.
> Ability to change the fileName dynamically in RollingFileAppender
> -----------------------------------------------------------------
>
> Key: LOG4J2-1185
> URL: https://issues.apache.org/jira/browse/LOG4J2-1185
> Project: Log4j 2
> Issue Type: New Feature
> Components: Appenders
> Affects Versions: 2.1
> Reporter: Dhwaneet Bhatt
> Assignee: Ralph Goers
> Fix For: 2.8
>
>
> Right now RollingFileAppender rolls over the current file with fileName to
> the one generated by FilePattern. However, logging always continues in the
> same fileName i.e. fileName once created cannot be changed.
> Property Substitution is only once during initialization, fileName is never
> changed after RollingFileManager is initialized. The RollingFileManager is
> very tightly tied up to the fileName attribute.
> Consider that I want to name my log files like this using RollingFileAppender:
> mylog-2015-10-30.log
> mylog-2015-10-29.log
> mylog-2015-10-28.log
> There is no good way to achieve this, because even after rolling over the
> file, the fileName would still remain the same. If I initialized my fileName
> using $\{date:yyyy-MM-dd\}, date would be substituted only once during
> initialization and it would never change, always continue to log in the same
> log file (until I restart my application).
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