You need to set the relevant System variable prior to log4j configuration,
e.g. with the -D option to the VM.

--

Thomas




| -----Original Message-----
| From: Jenny [mailto:[EMAIL PROTECTED]]
| Sent: 16 January 2003 17:54
| To: Log4J Users List
| Subject: Re: log4j.xml and variable substitution
|
|
| Hi,
| I remember sometime back there was a post states that
| we can do it like:
|
| <param name="DatePattern"
| value="'c:/log/${var}/'yyMMdd'.log'" />
|
| The var can be from system variable.
|
| But I have a question here. I configure log4j with the
| server, so the configure file are read on the startup.
| but at that time, the variable is not available yet,
| so the value becomes "c:/log//020116.log". whenever I
| restart the server, there will be an empty file
| created under c:/log, but the actual log file should
| be in the individual subdirectory of c:/log for
| differrent $var.
| How can i avoid to create the unuseful files?
|
| Thanks
|
| --- peter at merikan dot com <"peter at merikan dot
| com"@got.sema.se> wrote:
| > is it possible to use variable substitution in the
| > xml configuration file?
| >
| > if so,how?
| >
| > Regards
| > Peter
| >
| >
| > --
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