RFR: 8323670: A few client tests intermittently throw ConcurrentModificationException [v3]

[Alexey Ivanov]

On Tue, 30 Jan 2024 13:47:05 GMT, Tejesh R <tr at openjdk.org> wrote:

>> Suggested fix [JDK-8307091](https://bugs.openjdk.org/browse/JDK-8307091) also created concurrent exception intermittently (monthly once/quarterly once) on CI system. The issue was not able to be reproduced yet, hence proposing an alternative fix which uses iterators to compare the List.
>> CI testing shows green.
>
> Tejesh R has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:
> 
>  - Review updates - Indentatioins and unused imports
>  - Merge branch 'master' of https://git.openjdk.java.net/jdk into branch_8323670
>  - Revert fix 8307091 + Synchronised filecache
>  - Merge branch 'master' of https://git.openjdk.java.net/jdk into branch_8323670
>  - Fix

I forgot to add a direct link to the test: [`BasicDirectoryModelConcurrency.java`](https://github.com/aivanov-jdk/jdk/blob/7cdf8c3610898557e91190d2bae440829a663376/test/jdk/javax/swing/JFileChooser/FileSystemView/BasicDirectoryModelConcurrency.java)

> @mrserb I've been trying to write a regression test for this problem. Have I succeeded? Not quite… I am unable to get `ConcurrentModificationException` on any platform when I run the test locally.

I reproduced the issue a few times on macOS and once on Linux, on a local host rather than in CI.

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PR Comment: https://git.openjdk.org/jdk/pull/17462#issuecomment-1917430560