I have a class in src/groovy in my grails project.
How do i make a log field that gets injected with the correct logger for that class ?
Is there a commons logging or just log4j in grails ?
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3 Answers
Grails 1.X
A more Groovy way to do the same thing is:
private static log = LogFactory.getLog(this) This takes advantage of the fact that this in a static context refers to the Class object, so the line above can be copy-pasted from one class to another without modification.
Grails 2.X
Use the @Log4j annotation introduced in Groovy 1.8. This will add a log property
import groovy.util.logging.Log4j @Log4j class MyClass { def doIt() { log.info 'hello' } } A nice benefit of using the annotation is that the logger automatically converts calls such as this:
log.info 'hello' to:
if (log.isInfoEnabled() { log.info 'hello' } 
6 Comments
Azder
Cannot work: this is not available at the time of initializing the static field
Dónal
It does work, because in Groovy
this in a static context refers to the Class object. Obviously this is a difference between Java and Groovy. Try it out if you don't believe me :)
Chad Gorshing
I would assume the package would be org.slf4j.LoggerFactory, is this correct?
Dónal
No, that's the log4J LogFactory
user1559679
For completeness and correctness, we need to add the 'import' statement and '@Log4J' is actually '@Log4j'. I can confirm that it works in a class in /src/groovy with Grails 2.2.2: import groovy.util.logging.Log4j @Log4j class MiscUtils {...log.info "m: ${m}"...}
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You'd add it just like a regular Java class:
Logger log = Logger.getLogger(getClass()) // log4j or
Log log = LogFactory.getLog(getClass()) // commons logging 
1 Comment
Azder
This is how i solved it ATM, but stil means that my class is tied to the logging system even when the logging beans of the entire application get changed.
Using the standard Log4j's new Logger(getClass()) worked, but logged 'java.lang.Class' for me (using Grails 1.2.1). This problem went away with the Sublog plugin and @WithLog. See http://www.grails.org/plugin/sublog. This plugin also does not make Trace become Debug and Fatal Error...!
2 Comments
Azder
Hi Olivier, this question is kind of stale by now, since it was meant for grails 1.0.4.
Olivier Gourment
This is not mentioned in the question, though. My answer still stands! :-)