(println (seq (.getURLs (java.lang.ClassLoader/getSystemClassLoader))))

import java.net.URL;
import java.net.URLClassLoader;

public class PrintClasspath {
    public static void main(String[] args) {
        //Get the System Classloader
        ClassLoader sysClassLoader = ClassLoader.getSystemClassLoader();

        //Get the URLs
        URL[] urls = ((URLClassLoader)sysClassLoader).getURLs();

        for(int i=0; i< urls.length; i++)
        {
            System.out.println(urls[i].getFile());
        }
    }
}

9 thoughts on “Printing the class-path in Clojure”

1. Cool one liner. I’m just starting in on Clojure and played around until I could get the Clojure version to print in the same format as your Java version:

   (doseq [url (seq (.getURLs (java.lang.ClassLoader/getSystemClassLoader)))]
     (println (.getFile url)))
   

   Love it!
   .-= Matt´s last blog: The super easy way to use Emacs and Slime with Clojure =-.

   Reply

2. This might not work in all cases.
   You could also want:

   (import 'clojure.pprint)
   (pprint (seq (.getURLs (->  (Thread.currentThread)  (.getContextClassLoader)))))
   

   Reply

   1. Sorry:

      (use 'clojure.pprint)
      (import 'java.lang.Thread)
      (pprint (seq (.getURLs (-> (Thread/currentThread) (.getContextClassLoader)))))
      

      Reply

      1. Martin: syntactic variant on your example:

         (use 'clojure.pprint)
         (import 'java.lang.Thread)
         (-> (Thread/currentThread) (.getContextClassLoader) (.getURLs) (seq) (pprint))
         

      2. My code got messed with by WordPress and got quotes changed to backticks :( Don’t know how to format code in my comment, sorry.

      3. I fixed it, thanks for the code.

3. this code worked fine with the older version of clojure. I tried it with the newer one but unfortunately, it didn’t work out. What could be the issue??

   Reply

   1. It works for me in Clojure 1.2.1, what error are you getting?

      Reply
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