Yes, so your best bet is to use the RoutingAppender and only supply a default Route. The Appender itself will only be created when something is logged to the Route.
Ralph > On Feb 4, 2020, at 6:55 PM, Doug Wegscheid <dwegsch...@sbcglobal.net> wrote: > > 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 > <ralph.go...@dslextreme.com> 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 <dwegsch...@sbcglobal.net> 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. >> --------------------------------------------------------------------- To unsubscribe, e-mail: log4j-user-unsubscr...@logging.apache.org For additional commands, e-mail: log4j-user-h...@logging.apache.org
