private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
        in.defaultReadObject();
        map = (Map<K, V>) in.readObject();
    }
Read the map in using a custom routine.

@param in the input stream
@throws java.io.IOException
@throws ClassNotFoundException
@since Commons Collections 3.1
jphp-runtime/src/php/runtime/common/collections/map/ListOrderedMap.java