@Override
        public void addURL(@Nonnull URL url) {
            this.unopenedURLs.add(url);
            this.pathURLs.add(url);
        }
Accesses using sun.misc.Unsafe, supported on Java 9+.

@author Vaishnav Anil (https://github.com/slimjar/slimjar)
helper/src/main/java/me/lucko/helper/maven/URLClassLoaderAccess.java