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https://issues.apache.org/jira/browse/LOG4J2-921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14247799#comment-14247799
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Ralph Goers edited comment on LOG4J2-921 at 12/16/14 5:39 AM:
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Try using 2 '$' characters. I suspect the header string is being processed
during initial configuration before it is even passed to PatternLayout. With 2
'$' character the first will be stripped during initial configuration and then
the second will result in the value being replaced in the getHeader call.
This behavior is documented in the manual.
was (Author: [email protected]):
Try using 2 '$' characters. I suspect the header string is being processed
during initial configuration before it is even passed to PatternLayout. With 2
'$' character the first will be stripped during initial configuration and then
the second will result in the value being replaced in the getHeader call.
> Allow to log some important information at the start of each new roll over
> log file when using RollingFile Appender
> -------------------------------------------------------------------------------------------------------------------
>
> Key: LOG4J2-921
> URL: https://issues.apache.org/jira/browse/LOG4J2-921
> Project: Log4j 2
> Issue Type: Improvement
> Components: Appenders
> Affects Versions: 2.1
> Reporter: Setu
>
> if someone wants to log some important information at the start of each roll
> over log file there is no mechanism present in current version. The header
> attribute in PatternLayout barely does the job because it logs the header at
> the start of each system startup.
> Example: There is a requirement to log some system properties (or any other
> details, environment details, etc) at the each roll over so that it becomes
> easy to determine on which environment the software is running. When tried to
> use header attribute on a software that continuously runs on server it did
> not work as expected instead the header was logged whenever the server got
> restarted.
> Also how can they key supplied in header attribute be logged with line
> breaks.
> Example: when using {{header="$\{java:runtime} - $\{java:vm} - $\{java:os}"}}
> it prints all the information in same line which makes it unreadable if
> someone wants more details.
> Implementing a custom lookup did not help either as all it did was kept
> logging the custom lookup key in header attribute at each system restart
> instead of at the start of new rollover file.
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