Simple C3P0 passing to mapfn fails.

core.clj

(ns weird.core
  (:require
   [cascalog.api :refer [hfs-textline ?- stdout <- defmapfn]]
   [cascalog.cascading.conf :refer [with-serializations *JOB-CONF*]]
   [honeysql.helpers :as sql]
   [honeysql.core :as sql.eng])
  (:import
   [com.esotericsoftware.kryo Kryo]
   [com.esotericsoftware.kryo.serializers.JavaSerializer]
   [com.mchange.v2.c3p0 ComboPooledDataSource])
  (:gen-class))

(defn- jdbc-pool
  [host port database user password]
  (let [jdbc-url (format "jdbc:postgresql://%s:%s/%s" host port database)]
    {:datasource (doto (ComboPooledDataSource.)
                   (.setDriverClass "org.postgresql.Driver")
                   (.setJdbcUrl jdbc-url)
                   (.setUser user)
                   (.setPassword password))}))

(defmapfn get-baz
  [db foo bar]
  :stub)

(defn parse-line
  [line]
  (clojure.string/split line #"\s+"))

(defn -main
  "I don't do a whole lot ... yet."
  [path & args]
  (let [input (hfs-textline path)
        db (jdbc-pool "localhost" 5432 "pipeline" "pipeline" "pipeline")]
    (with-serializations ["org.apache.hadoop.io.serializer.WritableSerialization"
                          "cascading.tuple.hadoop.BytesSerialization"
                          "cascading.tuple.hadoop.TupleSerialization"
                          "com.esotericsoftware.kryo.serializers.JavaSerializer"
                          "com.twitter.chill.hadoop.KryoSerialization"]
      (?- (stdout)
          (<- [?foo ?bar ?baz]
              (input ?line)
              (parse-line ?line :> ?foo ?bar)
              (get-baz db ?foo ?bar :> ?baz))))))

project.clj

(defproject weird "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"}
  :profiles {:dev {:dependencies [[org.apache.hadoop/hadoop-core "1.2.1"]]}}
  :dependencies [[org.clojure/clojure "1.5.1"]
                 [cascalog "2.1.0"]
                 [honeysql "0.4.3"]
                 [postgresql "9.1-901-1.jdbc4"]
                 [org.clojure/java.jdbc "0.3.3"]
                 [org.apache.hadoop/hadoop-core "1.2.1"]
                 [c3p0/c3p0 "0.9.1.2"]]
  :main ^:skip-aot weird.core
  :target-path "target/%s"
  :profiles {:uberjar {:aot :all}})