Tomcat sets a catalina.home system property. You can use this in your log4j properties file. Something like this:
log4j.rootCategory=DEBUG,errorfile
log4j.appender.errorfile.File=${catalina.home}/logs/LogFilename.log
On Debian (including Ubuntu), ${catalina.home}
will not work because that points at /usr/share/tomcat6 which has no link to /var/log/tomcat6. Here just use ${catalina.base}
.
If your using another container, try to find a similar system property, or define your own. Setting the system property will vary by platform, and container. But for Tomcat on Linux/Unix I would create a setenv.sh in the CATALINA_HOME/bin directory. It would contain:
export JAVA_OPTS="-Dcustom.logging.root=/var/log/webapps"
Then your log4j.properties would be:
log4j.rootCategory=DEBUG,errorfile
log4j.appender.errorfile.File=${custom.logging.root}/LogFilename.log
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