clojure: access private field/method via reflection

reflection.clj

(defn invoke-private-method [obj fn-name-string & args]
  (let [m (first (filter (fn [x] (.. x getName (equals fn-name-string)))
                   (.. obj getClass getDeclaredMethods)))]
    (. m (setAccessible true))
    (. m (invoke obj args))))

(defn private-field [obj fn-name-string]
  (let [m (.. obj getClass (getDeclaredField fn-name-string))]
    (. m (setAccessible true))
    (. m (get obj))))