README.md

Configuring log4j in Grails

Special thanks to this blog. This is the best blog on log4j configuration for Grails I've ever read.

Tips

• If you wanna reference your own configuration in log4j config section, use Holders as shown
• If you wanna use DailyRollingFileAppender or any other appenders that are not pre-loaded, please import org.apache.log4j.*
• You can define variables like that
• You can use different environment settings

Config.groovy

import org.apache.log4j.*
import grails.util.Holders

myconfig {
    myvariable {
        workdir = 0
    }
}

log4j = {
    def pattern = new PatternLayout("[%p] [%c{3}] %m%n")

    appenders {
        appender new DailyRollingFileAppender(
                        name:"file",
                        file:"${Holders.config.myconfig.myvariable.workdir}/app.log",
                        layout: pattern,
                        datePattern: "'.'yyyy-MM-dd")

        rollingFile name:"stacktrace", 
                    file:"${Holders.config.myconfig.myvariable.workdir}/stacktrace.log", 
                    maxFileSize:'100KB'
        
        console name:"stdout",
                layout: pattern
    }

    root { 
        environments {
            production {
                error "file"
            }
            development {
                error "file", "stdout"
            }
        }
    }

    error   'org.codehaus.groovy.grails.web.servlet',        // controllers
            'org.codehaus.groovy.grails.web.pages',          // GSP
            'org.codehaus.groovy.grails.web.sitemesh',       // layouts
            'org.codehaus.groovy.grails.web.mapping.filter', // URL mapping
            'org.codehaus.groovy.grails.web.mapping',        // URL mapping
            'org.codehaus.groovy.grails.commons',            // core / classloading
            'org.codehaus.groovy.grails.plugins',            // plugins
            'org.codehaus.groovy.grails.orm.hibernate',      // hibernate integration
            'org.springframework',
            'org.hibernate',
            'net.sf.ehcache.hibernate'

    warn    'org.springframework',
            'org.hibernate',
            'grails.plugins.springsecurity',
            'groovyx.net.http'

    all     'grails.app'
    
}