I think that should just work because @JsFunction is usually used to 
provide callback functions to JavaScript. I don't know your exact API but 
something like

@JsFunction
interface Action {
  void exec();
}

@JsType(native = true.....)
class Item {
  // Alternatively use java.lang.Runnable in latest 2.8-SNAPSHOT instead of 
a handmade Action interface
  public Item(String name, Action action) {}
}

menu.addItem(new Item("action", this::doAction));

should work. If it doesn't try latest GWT 2.8-SNAPSHOT.


-- J.

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