generated gwt outputs reference to java.lang.Object

With the previously generated code:

public final native com.google.gwt.core.client.JsArray<java.lang.Object> getData() /*-

-*/;

GWT fails when it compiles this as it should instead be:

com.google.gwt.core.client.JsArray<com.google.gwt.core.client.JavaScriptObject>

Here is the class definition for JsArray:

public class JsArray<T extends JavaScriptObject> extends JavaScriptObject

This JSON object is being created for a package that I have tried to exclude via the enunciate.xml config:

<api-classes>
<exclude pattern="com.extjs.gxt.ui.client.data.*"/>
</api-classes>

I am not sure why it is not being excluded.