grails 2.1.2 log4j configuration strange behavior - grails

Question

I have following log4j configuration:
log4j = {
appenders {
appender new DailyRollingFileAppender(name: 'dailyAppender', ...)
}
root {
error 'dailyAppender'
}
info 'dailyAppender' : 'com.intelli', 'grails.app'
}
the "grails.app" logger is for grails artefacts (service, controllers, ..), while the "com.intelli" is for other custom loggers (like /src/groovy/**, ...) initialized with LogFactory class.
Now the issue is, that with this configuration the custom loggers ('com.intelli') were not logging anything. However grails controllers and services were logging fine!
When I changed the order of loggers:
log4j = {
...
info 'dailyAppender' : 'grails.app', 'com.intelli'
}
The custom loggers were logging fine, however grails services and controllers were not logging at all!

Answer 1

The solution is very tricky, you need to enclose the loggers in list ("[ ]") brackets:
log4j = {
appenders {
appender new DailyRollingFileAppender(name: 'dailyAppender', ...)
}
root {
error 'dailyAppender', additivity: false
}
info 'dailyAppender' : ['com.intelli', 'grails.app']
}
With this config, everything logs as it should.
This is not part of the issue, but to prevent double logging, we need to set additivity to false:
log4j = {
appenders {
appender new DailyRollingFileAppender(name: 'dailyAppender', ...)
}
root {
error 'dailyAppender'
}
info 'dailyAppender' : ['com.intelli', 'grails.app'], additivity: false
}