Can AutoBeanFactory encode List ???

I can't seem to figure out how to tell AutoBeanFactory to encode/
decode lists of objects. I have a simple bean object with string-
valued properties, and another bean object which has a list of the
first object. When I try to encode, I get a NullPointerException from
the AutoBeanCodex implementation. From the documentation in the wiki
(http://code.google.com/p/google-web-toolkit/wiki/AutoBean) it appears
that this is supposed to work, but what am I doing wrong?

Here is my test case:

public class BeanTest extends GWTTestCase {

interface MyFactory extends AutoBeanFactory {
AutoBean<Thing> thing ();
AutoBean<Bunch> bunch ();
}
interface Thing { // simple bean with one string-valued property
String getName ();
}
interface Bunch { // Simple bean with one List<Thing> valued property
List<Thing> getThings ();
}
public void testThing () {
Thing t1 = new Thing() { public String getName() { return
"one"; } };
Thing t2 = new Thing () { public String getName () { return
"two"; } };

MyFactory fact = GWT.create(MyFactory.class);
AutoBean<Thing> encodeBean = fact.create (Thing.class, t1);
String json = AutoBeanCodex.encode(encodeBean).getPayload();
System.out.println ("payload: " + json);

final Thing [] pair = { t1, t2 };
Bunch b = new Bunch() { public List<Thing> getThings() { return
Arrays.asList(pair); } };
AutoBean<Bunch> bunchBean = fact.create (Bunch.class, b);

// The following throws NullPointerException :(
json = AutoBeanCodex.encode(bunchBean).getPayload();
System.out.println ("payload: " + json);
}
}

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