Question

...
private Deque<PagePresenter> pageHistory = new ArrayDeque<PagePresenter>();
...

[ERROR] [test_app] - Line 8: No source code is available for type java.util.Deque<E>; did you forget to inherit a required module?

do I need to implement it myself?

Thanks,
/S

Answer 1

GWT includes a LinkedList implementation that implements part of the Dequeue interface (addFirst(), getFirst(), removeFirst(), addLast(), getLast(), removeLast()).

If you need a full Dequeue implementation you need to implement it (or at least the missing methods on LinkedList) yourself.