You'd have to create an instance of List that wraps your JsArray, or is a
copy of its content.
Using a few tricks [1], you could make it as easy as:
public List<Widget> getWidgets() {
return
Collections.unmodifiableList(Arrays.asList(JsArrays.toArray(getWidgetsAsJsArray())));
}
private native JsArray<Widget> getWidgetsAsJsArrays() /*-{
return this.widgets || [];
}-*/;
[1]
http://code.google.com/p/gwt-in-the-air/source/browse/trunk/src/net/ltgt/gwt/jscollections/client/JsArrays.java
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