Load a java .class file from disk directly into Clojure ... at your own risk obviously

load_class.clj

(ns load-class
  (:import (java.lang.reflect Array)
           (java.io FileInputStream)))

;; ClassLoader/defineClass is protected, and calling it from the proxy requires
;; reflection.
(def ^:private classloader-define-class
  (let [primitive-bytes (.getClass (Array/newInstance Byte/TYPE 0))
        args [String primitive-bytes Integer/TYPE Integer/TYPE]]
    (doto
      (.getDeclaredMethod ClassLoader "defineClass" (into-array Class args))
      (.setAccessible true))))

;; Read the primitive byte array and define a new class
(defn- define-class [class-loader ^String class-name class-bytes]
  (let [args [class-name class-bytes (int 0) (int (count class-bytes))]]
    (.invoke classloader-define-class class-loader (object-array args))))

;; Create a new class loader
(defn load-class! [{:keys [^String path ^String class-name]}]
  (.loadClass
    (proxy [ClassLoader] []
      (loadClass [clazz]
        ;; Use custom logic for the specific class to load, use default for
        ;; other classes
        (if (= clazz path)
          (define-class this class-name (.readAllBytes (FileInputStream. path)))
          (proxy-super loadClass clazz))))
    path))

(comment
  ;; E.g. take some java source code
  (def src
    "package x;

    public class AClass {
       private final String someField;
       public AClass(String someField) {
         this.someField = someField;
       }
       public String toString () {
         return \"AClass[\" + someField + \"]\";
       }
    }")

  ;; Compile it to a *.class file
  (do
    (spit "AClass.java" src)
    (clojure.java.shell/sh "javac" "AClass.java"))

  ;; And then finally load it in
  (let [loaded (load-class!
                 {:path       "AClass.class"
                  :class-name "x.AClass"})
        ctr (-> loaded .getConstructors first)]
    (.newInstance ctr (object-array ["foo"])))
  ;=> #object[x.AClass 0x4dacea49 "AClass[foo]"]
  )

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