Java Generics in GWT-RPC

We are having a SerializationException error when sending a list of objects using RPC and Java Generics.

I'm creating this widget to show the error:

public class Test<T> {        ListDataProvider<T> ldp = new ListDataProvider<T>();        public void setItems(List<T> list){          for(T t :list){              ldp.getList().add(t);          }      }        public List<T> getItems(){          return ldp.getList();        }    }

This is the code for creating the Test widget and passing a list of POJOs (where ExporterFormKey is the POJO object)

List<ExporterFormKey> list = new ArrayList<ExporterFormKey>();  ExporterFormKey key = new ExporterFormKey();  key.setKey("key1");  list.add(key);    Test<ExporterFormKey> test = new Test<ExporterFormKey>();  test.setItems(list);

At the end the next code throws a SerializationException:

service.sendList(test.getList(), new AsyncCallback...);

While the next one does fine:

service.sendList(list, new AsyncCallback...);

I found that doing the next code also works

List<ExporterFormKey> newList = new ArrayList<ExporterFormKey>(test.getItems());

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