@Override
 public int hashCode() {
   final int prime = 31;
   int result = 1;
   result = prime * result + ((parent == null) ? 0 : parent.hashCode());
   return result;
 }
 @Override
 public boolean equals(Object obj) {
   if (this == obj) return true;
   if (obj == null) return false;
   if (getClass() != obj.getClass()) return false;
   NestedJarFileModule other = (NestedJarFileModule) obj;
   if (parent == null) {
     if (other.parent != null) return false;
   } else if (!parent.equals(other.parent)) return false;
   return true;
 }
 @Override
 protected InputStream getNestedContents() {
   return new ByteArrayInputStream(parent.getContents(entry));
 }