java.swing 无法转换为 clojure Ifn

Question

对于 Ludum Dare 36，我决定在 coljure 中尝试基于文本的冒险游戏。它有效，但我收到一个非 fatal error :

Exception in thread "main" java.lang.ClassCastException: seesaw.core.proxy$javax.swing.JPanel$Tag$fd407141 cannot be cast to clojure.lang.IFn, compiling:(/tmp/form-init2500875452880490300.clj:1:73)

(ns ludumdare36.core
  (:gen-class :main true)
  (:use seesaw.core))

(def story [
            "Of all the most famous living rooms Transned's was the most famous"
            "two"
            "three"
            "four"
            "five"
            "six"
            "seven"
            "eight"
            "nine"
            ])

(def mainWindow (frame :title "Hello"  :content "" :on-close :exit))

(defn draw
  [items & args] (
                  (def mainWidget (vertical-panel :items items) )
                  (config! mainWidget :size [640 :by 480])
                  (config! mainWindow :content mainWidget)
                  (invoke-later(-> mainWindow pack! show!))))

(defn writeStory [text index & args]
  (let [makeButton (fn mb [index text]
                     (button :text text :mnemonic \N :halign :center :listen [:action (partial writeStory (get story index) (inc index))]))
        makeStoryNode (fn ms [text index]
                        (vector text (makeButton (inc index) "Yes") (makeButton (+ index 2 ) "No")))
        ]
    (draw (makeStoryNode text index))))

(defn -main
  [& args]
  (writeStory (get story 0) 0))                                             

Ifn 错误在堆栈上有相当详细的记录，但我不确定哪个函数导致了问题。也不确定我的代码的质量。所以请随意发表评论等。我如何重构以消除 Ifn 错误？我不明白什么？

Answer 1

从第 21 行开始，函数体周围有一组额外的括号；这可能是 clojure 认为您想要调用由 (def...) exp 返回的函数的潜在原因。但这会导致 Swing 对象无法按原样调用。