static class JavaXClassLoaderWithParent extends JavaXClassLoader {
  ClassLoader virtualParent;

  *(S progID, L<File> files, ClassLoader virtualParent) {
    super(progID, files);
    this.virtualParent = virtualParent;
  }
  
   protected Class<?> findClass(S name) throws ClassNotFoundException {
    if (!eq(name, "main") && !name.startsWith("main$")) {
      Class<?> c = virtualParent.loadClass(name);
      if (c != null) ret c;
    }
    ret super.findClass(name);
  }
}