RFR: 8367067: Improve exception handling in HttpRequest.BodyPublishers [v2]

[Volkan Yazici]

On Tue, 9 Sep 2025 13:15:27 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> It is provided in the ctor above using `Utils.BUFSIZE`, which reads the `jdk.httpclient.bufsize`  system property, and that can be negative.
>
> I think it would make more sense to make sure that Utils.BUFSIZE is initialized to a strictly positive value and only assert here. It could be useful to see if we have any test that set BUFSIZE to a small value - but if we don't maybe we could go and clamp it to e.g. `2^10 <= BUFSIZE < 2^24` or `2^10 <= BUFSIZE <= 2^23` if we want to keep powers of two.
> (2^24 - 1 is the maximum allowed value for [SETTINGS_MAX_FRAME_SIZE](https://www.rfc-editor.org/rfc/rfc9113.html#SETTINGS_MAX_FRAME_SIZE)  )

@dfuch, where shall I carry out that change?

1. In this PR?
2. In a follow-up a PR?
3. In a parallel PR to be merged before this one?

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PR Review Comment: https://git.openjdk.org/jdk/pull/26876#discussion_r2334423774