RFR: 8351000: StringBuilder getChar and putChar robustness

[Roger Riggs]

On Tue, 29 Apr 2025 14:13:20 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Improve StringBuilder getChar and putChar robustness with racy updates to StringBuilder. 
>> Test racing threads with append, insert, and reading characters.
>
> test/jdk/java/lang/StringBuilder/RacingSBThreads.java line 27:
> 
>> 25:  * @test
>> 26:  * @summary Test multi-threaded use of StringBuilder
>> 27:  * @compile --release 8 RacingSBThreads.java
> 
> Is there a reason for this specific release number?

Yes, so the test can be compiled and run on older versions. Specifically, restricting the use of String.repeat.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24951#discussion_r2066663882