Grails not printing messages to log file using custom appender - grails

Question

My Grails application is going to mirgate an existing database to a new database. I got some unformatted email addresses from the existing database which do not pass validation with my Grails application because of a constraint (email:true), so I get a field error.
I want write these field errors in a log file. How can I do that? I tried a Appender in log4J. It will somehow create a log file so-call "migration.log", but it does not write any field error into this log file.
log4j = {
// Example of changing the log pattern for the default console
// appender:
//
appenders {
// console name:'stdout', layout:pattern(conversionPattern: '%c{2} %m%n')
appender new FileAppender(
name: "migrationAppender",file : "migration.log", layout: pattern(conversionPattern: "%c{2} %m%n")
)
}
This is configration. I define a FileAppender.
In my service. I just call the following:
def foundation = new Foundation(name: name, foundationName: foundationName).addToAddresses(address).addToCommunicationMedia(email)
foundation.validate()
if (!foundation.hasErrors()) {
foundation.save(flush: true)
}
else {
log.error "${foundation.errors}"
}
In the console, the errors occur and I saw a "migration.log" has been created, but somehow the file in empty.
Error 2011-09-26 09:00:29,543 [main] ERROR service.MasterDataMigrationService - org.springframework.validation.BeanPropertyBindingResult: 1 errors
Field error in object 'de.rvgmbh.nemesis.migration.domain.partner.participant.IndividualPerson' on field 'communicationMedia[0].address': rejected value [erbelrechtsanwalt-eberl.de];

Answer 1

log4j = {
appenders {
rollingFile name:"file", maxFileSize:(1024*1024), file:"migration.log", maxBackupIndex:10
environments {
development {
console name:'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.mortbay.log'
environments {
development {
root {
info 'file', 'stdout'
}
debug 'grails.app'
}//development
test {
root {
info 'file'
}
info 'grails.app'
}
production {
root {
info 'file'
}
info 'grails.app'
}
}
}
dev: logs to console and file from debug level
test: logs to file from info level
prod: logs to file from info level