environments {
    development {
        log4j = {
            // in development mode, let's see all my log messages
            debug 'grails.app'
        }
    }

    production {
        def catalinaBase = System.properties.getProperty('catalina.base')
        if (!catalinaBase) catalinaBase = '.'   // just in case
        def logDirectory = "${catalinaBase}/logs"

        log4j = {
            appenders {
                // set up a log file in the standard tomcat area; be sure to use .toString() with ${}
                rollingFile name:'tomcatLog', file:"${logDirectory}/${appName}.log".toString(), maxFileSize:'100KB'
                'null' name:'stacktrace'
            }

            root {
                // change the root logger to my tomcatLog file
                error 'tomcatLog'
                additivity = true
            }

            // example for sending stacktraces to my tomcatLog file
            //error tomcatLog:'StackTrace'

            // set level for my messages; this uses the root logger (and thus the tomcatLog file)
            info 'grails.app'
        }
    }
}