Question

Solution

(1) (println (. System getProperty "java.library.path"))

This gives me a list of places java looks for native extensions.

Then, I took the lwjgl native extensions, and put them there.

Things that didn’t work for me (probably because I used them incorrectly)

(*) setting :native-path
(*) setting :native-dependencies

Problem

My setup:

(lein deps; echo "====="; cat project.clj; echo "====="; cat src/main.clj; echo "====="; lein repl) &> log

contents of “log”

    Copying 10 files to /Volumes/ramdisk/fail/lib
=====
(defproject
  mincase "0.0.1"
  :dependencies [[org.clojure/clojure "1.4.0"]
                 [org.lwjgl.lwjgl/lwjgl "2.8.2"] ]
  :repositories {"local" "/Users/x/z/maven_repo"}
  :jvm-opts ["-Xms4g"  "-Xmx4g"]
  :repl-init main
  )

=====
(ns main
 (:import org.lwjgl.opengl.Display)) 
=====
REPL started; server listening on localhost port 31235
UnsatisfiedLinkError no lwjgl in java.library.path  java.lang.ClassLoader.loadLibrary (ClassLoader.java:1860)
clojure.core=> 

Note — I had already done a “lein deps”, so the lwjgl library has been pulled into maven. What I don’t understand are:

(*) how do I get access to lwjgl from Clojure?
(*) more importantly, how do I debug which step this whole thing has gone wrong at?

$ find lib

lib
lib/clojure-1.4.0.jar
lib/jinput-2.0.5.jar
lib/jinput-platform-2.0.5-natives-linux.jar
lib/jinput-platform-2.0.5-natives-osx.jar
lib/jinput-platform-2.0.5-natives-windows.jar
lib/jutils-1.0.0.jar
lib/lwjgl-2.8.2.jar
lib/lwjgl-platform-2.8.2-natives-linux.jar
lib/lwjgl-platform-2.8.2-natives-osx.jar
lib/lwjgl-platform-2.8.2-natives-windows.jar

So it appears that lwjgl has been pulled in.

What are the steps I should try to figure out which step I went wrong on?

Thanks!

Answer 1

Looks like a problem with your LD_LIBRARY_PATH. Are you including the correct .dll or .so files?

You probably need to add something like :native-dependencies [[lwjgl "2.8.2"]] to your project.clj.

Alternatively, you could try setting the right value from your shell:

export LD_LIBRARY_PATH=/home/username/lwjgl-2.8.2/native/linux/