how can i use log4j in grails application?

how can i use log4j in grails app开发者_如何学Golication?

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Look at the Logging section of the manual. log4j is built in and has a basic configuration out of the box.

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You could use log4j right from the box, for example:

log.debug "The value of foo is $foo"

Configuration of logging in last version

If you are into unit testing be sure to check mockLogging method in Testing section.