Logging errors in a grails application in the logs - exception

Question

When my Grails application crashes, it shows the error and the stacktrace on the error page because the error.gsp page has the following snippet <g:renderException exception="${exception}" />. However nothing gets logged in the log file.
How can I change this? because for the production application I plan to remove the renderException because I don't want users to see the entire stacktrace.
My log4j settings are as follows:
appenders {
rollingFile name:'catalinaOut', maxFileSize:1024, fileName:"${System.properties.getProperty('catalina.home')}/logs/mylog.log"
}
root {
error 'catalinaOut'
debug 'catalinaOut'
additivity = true
}
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',
'grails.app'
debug 'grails.app'
}
I'm running the app in development as grails run-app

Answer 1

I use these settings for console and file based logging. You can remove stdout if you don't want/need console. Just copy all your error classes in the corresponding list.
log4j = {
def loggerPattern = '%d %-5p >> %m%n'
def errorClasses = [] // add more classes if needed
def infoClasses = ['grails.app.controllers.myController'] // add more classes if needed
def debugClasses = [] // add more classes if needed
appenders {
console name:'stdout', layout:pattern(conversionPattern: loggerPattern)
rollingFile name: "file", maxFileSize: 1024, file: "./tmp/logs/logger.log", layout:pattern(conversionPattern: loggerPattern)
}
error stdout: errorClasses, file: errorClasses
info stdout: infoClasses, file: infoClasses
debug stdout: debugClasses, file: debugClasses
}