Problem decoding complex AutoBean

I've managed a simple AutoBean with a list. Now I've a more complex one, and I don't understand what's wrong. My get methods are returning null though the debugger shows the object has data.

The JSON looks like this:

{

  "mquery":

    {

      "screenname":"Index Card",

      "fields":

        {

          "field":[

            {"title":"Name",  "name":"odname",   "value":"*TIFF*"},

            {"title":"Date",  "name":"oddate",   "value":""},

            {"title":"Ref #", "name":"odrefnum", "value":""}

          ]

        }

    }

} 

I have three interfaces:

public interface Field {

  String getTitle();

  void setTitle(String title);

  String getName();

  void setName(String name);

  String getValue();

  void setValue(String value);

}

public interface FieldList {

  List<Field> getField();

  void setField(List<Field> field);

}

public interface MQuery {

  String getScreenname();

  void setScreenname(String screenname);

  FieldList getFields();

  void setFields(FieldList fields);

}

In my bean factory, I have

public interface BeanFactory extends AutoBeanFactory {

  ...

  AutoBean<Field> field();

  AutoBean<FieldList> fields();

  AutoBean<MQuery> mquery();

}

In my onResponseReceived() method, I call

  AutoBean<MQuery> mqueryBean = 

      AutoBeanCodex.decode(clientFactory.getBeanFactory(), 

          MQuery.class, response.getText());

  MQuery mQuery = mqueryBean.as();

  logger.log(Level.INFO, mQuery.getScreenname());

  screenName = mQuery.getScreenname();

  fieldList = mQuery.getFields().getField();

  view.renderFields(fieldList);

When I look at the debugger in Chrome, screenname, etc are populated (in mQuery:this$0:data_0 there is mquery with screenename set and 3 field objects in fields). However mQuery.getScreenname() returns null as does mQuery.getFields().

What am I not seeing here? Could the presence of other AutoBean<>s in my factory (beans that work) be messing me up (do I need a separate factory)?

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