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POswap! atom and then: java.lang.ClassCastException: java.lang.String cannot be cast to clojure.lang.IFn
 

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  1. POswap! atom and then: java.lang.ClassCastException: java.lang.String cannot be cast to clojure.lang.IFn
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    <p>So, in my core.clj file I have: </p> <pre><code>(def page-buffer (BufferedReader. (InputStreamReader. (clojure.java.io/input-stream (clojure.java.io/resource "mitochondria.html"))))) (def parsed-page (atom "")) </code></pre> <p>and then later: </p> <pre><code>(defn -main [&amp; args] (let [port (Integer/parseInt (first args))] (swap! parsed-page (with-open [] (.toString (reduce #(.append %1 %2) (StringBuffer.) (line-seq page-buffer))))) (println "Server is starting") (println "port: " port) (run-server port))) </code></pre> <p>This compiles and then I turn it into an uberjar. But when I run it I get the line with swap! blows up: </p> <pre><code>Exception in thread "main" java.lang.ClassCastException: java.lang.String cannot be cast to clojure.lang.IFn at clojure.core$swap_BANG_.invoke(core.clj:2106) at serve_pages_from_memory.core$_main.doInvoke(core.clj:29) at clojure.lang.RestFn.applyTo(RestFn.java:137) at serve_pages_from_memory.core.main(Unknown Source) </code></pre> <p>I tried this without using an atom and everything worked just fine (using a var defined with "def" to be a string) but eventually I want to send this var to multiple threads, so I need for this to be an atom or agent. </p> <p>What have I done wrong? </p> <p>UPDATE: </p> <p>Jeremy Heiler, thanks. Fixed, but the result is ugly as sin:</p> <pre><code>(defn parse-buffer [&amp; everything-else] (with-open [] (.toString (reduce #(.append %1 %2) (StringBuffer.) (line-seq page-buffer))))) (defn -main [&amp; args] (let [port (Integer/parseInt (first args))] (swap! parsed-page parse-buffer) (println "Server is starting") (println "port: " port) (run-server port))) </code></pre> <p>I have to give an argument to parse-buffer or I get an error. But I do not use the argument, so this is ugly. I must be writing this wrong, yes? </p>
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