private void addClassPath(final URL url) throws IOException { final URLClassLoader sysloader = (URLClassLoader) ClassLoader.getSystemClassLoader(); final Class<URLClassLoader> sysclass = URLClassLoader.class; try { final Method method = sysclass.getDeclaredMethod("addURL", new Class[] {URL.class}); method.setAccessible(true); method.invoke(sysloader, new Object[] {url}); } catch (final Throwable t) { t.printStackTrace(); throw new IOException("Error adding " + url + " to system classloader"); } }