RFR: 8365588: defineClass that accepts a ByteBuffer does not work as expected [v2]

[Alan Bateman]

On Tue, 30 Sep 2025 20:00:09 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Xueming Shen has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:
>> 
>>   8365588: defineClass that accepts a ByteBuffer does not work as expected
>
> src/java.base/share/classes/java/lang/ClassLoader.java line 1069:
> 
>> 1067:             try (var arena = Arena.ofConfined()) {
>> 1068:                 ByteBuffer bb = arena.allocate(len).asByteBuffer();
>> 1069:                 bb.put(0, b, b.position(), len);
> 
> Do we need to acquire/release session on the base buffer too?

Good question but no, this buffer comes from a thread confined arena so it can't be closed asynchronously.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27569#discussion_r2399261537