log4j: Change format of loggers configured in another library.

Posted by Ignacio Thayer on Stack Overflow See other posts from Stack Overflow or by Ignacio Thayer
Published on 2010-04-23T00:36:29Z Indexed on 2010/04/23 0:43 UTC
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clojure

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logging

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log4j

Using clojure, I've been able to successfully setup log4j very simply by using this log4j.properties file, and including log4j in my classpath.

# BEGIN log4j.properties

log4j.appender.STDOUT=org.apache.log4j.ConsoleAppender
log4j.appender.STDOUT.layout=org.apache.log4j.PatternLayout
log4j.appender.STDOUT.layout.ConversionPattern=%d{MMdd HHmmss SSS} %5p %c [%t] %m\n

log4j.rootLogger=DEBUG, STDOUT

Then after :use'ing clojure.contrib.logging, I'm able to print a statement with the desired formatting as expected like so:

(info "About to print this")
(debug "This is debug-level")

My question is how to achieve a consistent formatting for logging statements made from loggers configured in other libraries. I thought I could find existing loggers using org.apache.log4j.LogManager.getCurrentLoggers() and change the PatternLayouts there, but I'm not able to iterate over that enumeration in clojure, as I get the following error:

Dont know how to create ISeq from: java.util.Vector$1

I assume this is possible somehow, and probably very simply. How?

Thanks much.

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