Grails logging: Multiple loggers and appenders

Question

I am trying to configure a Grails (2.2.0) app to have a log file for a specific package and then use the console output for everything else. I also want to make sure that nothing that goes to the log file also goes to the console (keep them totally separate). Reading through the docs I am still a bit confused on how to get this done. Could someone help out with an example that accomplishes this (using the log4j DSL)?

Answer 1

I got this working with help from this question. Here's what I ended up with in my Config.groovy:

log4j = {
    appenders {
        console name: 'stdout', layout: pattern(conversionPattern: '%d{yyyy-MM-dd/HH:mm:ss.SSS} [%t] %x %-5p %c{2} - %m%n')

        rollingFile name: 'extraAppender',
                conversionPattern: '%d{yyyy-MM-dd/HH:mm:ss.SSS} [%t] %x %-5p %c{2} - %m%n',
                maxFileSize: 1024,
                file: '/tmp/logs/extra.log'
    }

    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'

    trace  additivity: false, extraAppender: 'extraLogger'
}

Then in the class that's supposed to use the extraLogger, I just go the logger like this:

def extraLogger = LoggerFactory.getLogger('extraLogger')

That lets me log more things to the console and some other specific things to another log file, without any of those specific things ending up in the console log.