Groovy Grails: how to set path of log4j.properties that works in Windows and Linux

Question

In groovy grails project, I want to externalized log4j.properties file and I want to make generic relative path to make it work in Linux and Windows.

To externalize, I have removed log4j = { ... } code from grails-app/conf/Config.groovy And updated the file grails-app/conf/spring/resources.groovy with the following code.

beans = {
    log4jConfigurer(org.springframework.beans.factory.config.MethodInvokingFactoryBean) {
        targetClass = "org.springframework.util.Log4jConfigurer"
        targetMethod = "initLogging"
        arguments = ["./log4j.properties"]
    }
}

The log4j.properties file is in root directory of tomcat, where webapps, conf, etc folders exists. /tomcat/log4j.properties

The above code works on Windows but not in linux machine.

I have tried the following:

1. Setting the following:

    arguments = ["${System.properties['catalina.home']}/log4j.properties"]
   

2. Also I have tried setting a value grails-app/conf/Config.groovy as

    grailsApplication.config.log4j_path = "${System.properties['catalina.home']}/log4j.properties"
   

And tried using it in grails-app/conf/spring/resources.groovy file as:

 arguments = [grailsApplication.config.log4j_path]

but non worked.

Can someone tell me how can I set path so that it can work in both Windows and Linux.

Any help is appreciated.