How to ser/deser ListMultimap via protostuff

[squallud]

The object struct is like this:

public class ListMultiMapWrapper

{

    ListMultimap data;

    public ListMultiMapWrapper(final ListMultimap data)

    {

        this.data = data;

    }

    public ListMultimap getData()

    {

        return data;

    }

}

public void testLinkedListMultimapSerde()

{

    ListMultimap<String, String> listMultimap = LinkedListMultimap.create();

    listMultimap.put("xy", "xy1");

    listMultimap.put("xy", "xy2");

    ListMultiMapWrapper commonDataWrapper = new ListMultiMapWrapper(listMultimap);

    //do ser and deser

    ....

}

After deserialize, the deserialized ListMultimap is empty. How to ser/deser ListMultimap via protostuff?