Log4j vs. datomic-free

core.clj

(ns logtest.core
 (:use [clojure.tools.logging]
       [clojure.tools.logging.impl :only [log4j-factory]]))

(defn foo
  "I don't do a whole lot."
  []
  (binding [*logger-factory* (log4j-factory)] (info "!")))

gistfile1.txt

log4j.rootLogger=INFO, C, R

log4j.appender.C=org.apache.log4j.ConsoleAppender
log4j.appender.C.layout=org.apache.log4j.PatternLayout
log4j.appender.C.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c %x - %m%n

log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=/tmp/log.log
log4j.appender.R.MaxFileSize=1000kB
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c %x - %m%n

project.clj

(defproject logtest "0.1.0-SNAPSHOT"
  :description "FIXME: write description"
  :url "http://example.com/FIXME"
  :license {:name "Eclipse Public License"
            :url "http://www.eclipse.org/legal/epl-v10.html"}
  :jvm-opts ["-Dlog4j.configuration=log4j.properties"]
  :dependencies [[org.clojure/clojure "1.4.0"]
                 [com.datomic/datomic-free "0.8.3619"]

                 [org.clojure/tools.logging "0.2.3"]
                 [log4j "1.2.17"]])