RFR: 8340572: ConcurrentModificationException when sorting ArrayList sublists

[Chen Liang]

On Sun, 29 Sep 2024 17:44:30 GMT, Attila Szegedi <attila at openjdk.org> wrote:

> Fixes a regression with #17818 where `ArrayList.subList(…).sort()` started incrementing `ArrayList.modCount` resulting in some cases throwing a `ConcurrentModificationException` where none was thrown before.
> 
> This change keeps the optimization from #17818 but restores the behavior where only sorting the `ArrayList` changes the mod count, but sorting its sublists does not.

test/jdk/java/util/ArrayList/Bug8340572.java line 34:

> 32:  */
> 33: 
> 34: public class Bug8340572 {

Can we give this a descriptive name, like `ConcurrentSubListSort`?

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PR Review Comment: https://git.openjdk.org/jdk/pull/21250#discussion_r1783800883