The only solution that comes to my mind if you want to set the property even
before log4j is started is to set it through the java command as i mentioned in
my earlier mail. However, if you want to set the property when your application
is *getting deployed*, then there appears to be another way to do this. You can
have a *startup servlet* in your application which will set this system
property. Something like:
web.xml:
-------------
<servlet>
<servlet-name>MyConfigServlet</servlet-name>
<servlet-class>org.myapp.MyConfigServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
Then the code in your startup servlet(MyConfigServlet.java) would look like:
public void init(ServletConfig config) throws ServletException {
System.setProperty("myWebApp","somepath");
}
This would mean that when your application is being deployed the variable
value will be set.
Now, comes the tricky part. Since the log4j is already configured before
coming to your servlet, the change to the myWebApp variable(which is refered in
some appender) will have to be reflected to log4j.
You can something like:
Logger.getRootLogger().getLoggerRepository().resetConfiguration();
This would tell log4j to configure itself again afresh and this time your
myWebApp property is already set.
So your startup servlet would ultimately look like:
public void init(ServletConfig config) throws ServletException {
System.setProperty("myWebApp","somepath");
Logger.getRootLogger().getLoggerRepository().resetConfiguration();
}
This approach does have a drawback:
- When you invoke the resetConfiguration() method some of the log files will
get cleared(if the append is set to false on those appender configuration) and
hence you will lose the previously logged data.
regards,
-Jaikiran
"[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
Yes, this could be a solution I've already tried it, but I wonder whether is
possible to set a SystemProperty before log4j is even loaded so that
FileAppender.file=${myWebAppVariable}\${logfileName}
does make sense.
I'm just imagine a ClassLoader workaround but I can't see anything concrete.
> If you always deploy to the same location under the app server you
> could check if that is a property for the app server (i.e.
> catalina.home) that you could use as your base.
>
> On 7/24/06, [EMAIL PROTECTED] wrote:
> > Hi everyone,
> > I'd like that classes running in a web application would log to a file
> > whose path is local to the absolute path where the web app is running. This
> > means that, named ${myWebApp} my web application, I'd like to define the
> > FileAppender file property to
> > ${myWebApp}'s absolute path . I've tried doing this by creating a
> > ServletContextListener implementation and declaring in it a SystemProperty,
> > but it doesnt work so far: i mean, it works but not the very first time
> > that the web app rises, and this happens because class loader loads the
> > log4j.jar before the ContextListener had called,I presume. Any hints are
> > appreciated
> >
> > Ign Rome, Italy
> >
> >
> > ___________________________________________________________________
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> >
> >
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>
>
> --
> James Stauffer
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>
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