JDK-8091393: Observable collections for ObservableMap views

[John Hendrikx]

It's not binary compatible, as changing the return type results in a new 
method that compiled code won't be able to find.

See also "change result type (including void)" here: 
https://wiki.eclipse.org/Evolving_Java-based_APIs_2#Evolving_API_interfaces_-_API_methods

--John

On 30/05/2022 03:22, Nir Lisker wrote:
> 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