Hi, Picking up an old issue, JDK-8091393 [1], I went ahead and looked at the work needed to implement it.
keySet() and entrySet() can both be made to return ObservableSet rather easily. values() will probably require an ObservableCollection<E> type. Before discussing these details, my question is: is it backwards compatible to require that these methods now return a more refined type? I think that it will break implementations of ObservableMap out in the wild if it overrides these methods in Map. What is the assessment here? https://bugs.openjdk.java.net/browse/JDK-8091393
