yes, that works as designed, but does not resolve my problem. The filename is
not evaluated when the first event is written (after we have a good date/time),
it's evaluated when log4j2 is configured (which is before when we have a good
date/time set).
On Tuesday, February 4, 2020, 08:19:16 PM EST, Ralph Goers
<[email protected]> wrote:
The FileAppender has an option named createOnDemand. If you set it to true
then the file will only be created when a log event is written to it. See
http://logging.apache.org/log4j/2.x/manual/appenders.html#FileAppender
<http://logging.apache.org/log4j/2.x/manual/appenders.html#FileAppender>.
Ralph
> On Feb 4, 2020, at 2:10 PM, Doug Wegscheid <[email protected]> wrote:
>
>
> I am trying to have log4j2 write log files with names YYYYmmdd-HHMMSS.log,
> but not start writing the file until we have a good system time (>year 1986).
> I have an application running on a system that boots up, and takes a while to
> get the correct time; until that happens, the system thinks it's back in
> 1970, and there really is no point to writing a log file with a bum date.
>
> Using a custom filter, I can get the FileAppender to not write any events
> until the system time is set. I can get the FileAppender to not open the file
> until the first event is passed by the custom filter (createOnDemand="true").
> Using Log4J2 - assigning file appender filename at runtime, I can get the
> file named YYYYmmdd-HHMMSS.log, but the YYYYmmdd-HHMMSS.log in the
> configuration XML seems to get evaluated when log4j2 is initialized (not when
> the file is opened), so my file name is still 19700101-000000.log.
>
> Is there a way to defer evaluation of the name for a log4j2 FileAppender
> until the file is actually opened? Alternatively, is there a sneaky way to
> use RollingFileAppender to do this? (I don't see a way to change the filename
> of the current file there, just old files)
>
> I could do a custom appender (FileAppender/FileManager just are not all that
> long), but I'm trying to avoid that if possible.
>
