RE: Specifying log file location when moving from development to production

["Shapira, Yoav" <Yo...@mpi.com>]

Howdy,

>I have to remember to swap which line is commented out when I move the
app
>to production.  I forget where the log file wants to go naturally (with
no
>path) on Unix, but it wasn't the same place as on Windows.  Then if you
>start Tomcat as an NT service as a coworker of mine does, the log file
>wants
>to go somewhere else entirely, so the relative path doesn't work.
>
>Has anyone got a way to deal with this programmatically, either one
setting
>that will work for both Windows and Unix, or something that Ant can do,
>or... ?

If I'm doing something simple / quick / in house I use Ant's copy with
filtering.  So my log4j.properties file looks like:
log4j.appender.blah.File=@logFile@

And the ant <copy> task that copies log4j.properties to its deployment
location has filtering="true" and a logFile token with the appropriate
value.

Another approach is to use an environment variable, e.g.
log4j.appender.blah.File=$CATALINA_HOME/logs/myFile.txt

When I'm doing something long-term / for external customers, I typically
stick an <env-entry> in web.xml and let the server administrator plug in
the appropriate value (for tomcat, this would be an <Environment> entry
in server.xml).  This JNDI approach is very portable.  It works for me
as I like to configure log4j programmatically anyways.

Yoav Shapira



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