public class CPath {
    private static final Class[] parameters = new Class[] {URL.class};

    public static void addFile(String s) throws IOException
    {
        File f = new File(s);
        addFile(f);
    }

    public static void addFile(File f) throws IOException
    {
        addURL(f.toURI().toURL());
    }

    public static void addURL(URL u) throws IOException
    {
        URLClassLoader sysloader = (URLClassLoader) ClassLoader.getSystemClassLoader();
        Class sysclass = URLClassLoader.class;

        try {
            Method method = sysclass.getDeclaredMethod("addURL", parameters);
            method.setAccessible(true);
            method.invoke(sysloader, new Object[] {u});
        } catch (Throwable t) {
            t.printStackTrace();
            throw new IOException("Error, could not add URL to system classloader");
        }

    }
}