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  Modify java.library.path programmatically  (Read 2597 times)
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Offline ra4king

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« Posted 2011-12-27 10:52:22 »

According to this (closed) bug report, java.library.path is meant to be a read-only property. However this workaround solves that problem:

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public static void addDir(String s) throws IOException {
    try {
        // This enables the java.library.path to be modified at runtime
        // From a Sun engineer at http://forums.sun.com/thread.jspa?threadID=707176
        //
        Field field = ClassLoader.class.getDeclaredField("usr_paths");
        field.setAccessible(true);
        String[] paths = (String[])field.get(null);
        for (int i = 0; i < paths.length; i++) {
            if (s.equals(paths[i])) {
                return;
            }
        }
        String[] tmp = new String[paths.length+1];
        System.arraycopy(paths,0,tmp,0,paths.length);
        tmp[paths.length] = s;
        field.set(null,tmp);
        System.setProperty("java.library.path", System.getProperty("java.library.path") + File.pathSeparator + s);
    } catch (IllegalAccessException e) {
        throw new IOException("Failed to get permissions to set library path");
    } catch (NoSuchFieldException e) {
        throw new IOException("Failed to get field handle to set library path");
    }
}


For those of you who really need to run a LWJGL application by double clicking the jar yet you want the natives in their own subfolder, this is for you Smiley

Obviously this might not be portable across JVMs.

Source: http://nicklothian.com/blog/2008/11/19/modify-javalibrarypath-at-runtime/

Offline Nate

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« Reply #1 - Posted 2011-12-27 15:36:29 »

You can also write a classloader to find the natives and load your app using the classloader.

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