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https://issues.apache.org/jira/browse/LOG4J2-1185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15964851#comment-15964851
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Ralph Goers commented on LOG4J2-1185:
-------------------------------------
You have to omit the fileName attribute entirely. The rolling file appender
will write directly to the target file using its pattern.
> 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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