On Fri, 21 Oct 2022 11:56:57 GMT, Сергей Цыпанов <d...@openjdk.org> wrote:
>> src/java.base/share/classes/java/util/TreeMap.java line 3329:
>>
>>> 3327: }
>>> 3328: else {
>>> 3329: return (Comparator<Map.Entry<K, V>> & Serializable)
>>> (e1, e2) -> {
>>
>> I think this cast hints compiler to bootstrap lambda meta factory with extra
>> Serializable marker interface. Meanwhile, Comparator.naturalOrder does not
>> implement Serializable.
>
> From one point this is obviously a change in behaviour, from another the spec
> of `Spliterator.getComparator()` says nothing about serializability of
> returned comparator and the actual value is hardly ever going to be
> serialized.
The only new comparator that is returned here is the one returned by
`Map.Entry.comparingByKey()`, which is also `Serializable`.
The only place `Comparator.naturalOrder()` is newly used in this PR are the
`final` `package‑private` `getEntry` and `getEntryUsingComparator` methods.
-------------
PR: https://git.openjdk.org/jdk/pull/9901
