Classloader changes between defsketch and setup

quil-kinect.core.clj

(ns quil-kinect.core
  (import SimpleOpenNI.SimpleOpenNI)
  (:use quil.core
        [quil.applet :only [current-applet applet-close]]))

(def kinect (atom nil))

(defn setup []
  (let [_ (println (.getClassLoader clojure.lang.IDeref))
        kinect-obj (new SimpleOpenNI (current-applet))
        _ (println (.getClassLoader clojure.lang.IDeref))]
    (swap! kinect (fn [_] :totes-a-kinect)))
  (when-not (.enableDepth @kinect)
    (throw (new Error (str "Couldn't set up the kinect object! Are you sure "
                           "it's plugged in to both your computer and "
                           "power?")))
    (applet-close))
  (frame-rate 30))

(defn draw []
  (background 0)
  (.update @kinect)
  (let [depth-image (.depthImage @kinect)]
    (image depth-image 0 0)))

(println (-> (Thread/currentThread) .getContextClassLoader))
(defsketch kinect
  :title "Can Haz Kinect!"
  :setup setup
  :draw draw
  :size [640 480])

repl output

[dlp@fiona:~/code/personal/quil-kinect?:0]% lein repl
REPL started; server listening on localhost port 46067
user=> (use 'quil-kinect.core)
#<DynamicClassLoader clojure.lang.DynamicClassLoader@45c3987>
#<AppClassLoader sun.misc.Launcher$AppClassLoader@5ab8df17>
SimpleOpenNI Version 0.26
nil
user=> #<AppClassLoader sun.misc.Launcher$AppClassLoader@5ab8df17>
Exception in thread "Animation Thread" java.lang.ClassCastException: quil.applet.proxy$processing.core.PApplet$IMeta$c5
06c738 cannot be cast to clojure.lang.Atom
        at clojure.core$swap_BANG_.invoke(core.clj:2106)
        at quil_kinect.core$setup.invoke(core.clj:12)
        at clojure.lang.Var.invoke(Var.java:397)
        at quil.applet$applet$setup_fn__157.invoke(applet.clj:193)
        at quil.applet$applet$fn__232.invoke(applet.clj:291)
        at quil.applet.proxy$processing.core.PApplet$IMeta$c506c738.setup(Unknown Source)
        at processing.core.PApplet.handleDraw(Unknown Source)
        at quil.applet.proxy$processing.core.PApplet$IMeta$c506c738.handleDraw(Unknown Source)
        at processing.core.PApplet.run(Unknown Source)
        at quil.applet.proxy$processing.core.PApplet$IMeta$c506c738.run(Unknown Source)
        at java.lang.Thread.run(Thread.java:680)