RFR: 8367859: Remove nio exception gensrc

[Naoto Sato]

On Wed, 17 Sep 2025 18:57:45 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> An alternative implementation to https://github.com/openjdk/jdk/pull/27338, which removes the entire gensrc stage and instead permanently checks in the generated Java files.

charset package changes look good to me

src/java.base/share/classes/java/nio/charset/IllegalCharsetNameException.java line 30:

> 28: /**
> 29:  * Unchecked exception thrown when a string that is not a
> 30:  * <a href="Charset.html#names">legal charset name</a> is used as such.

Could utilize new construct as `{@linkplain Charset##names legal charset name}`

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Marked as reviewed by naoto (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27352#pullrequestreview-3240774915
PR Review Comment: https://git.openjdk.org/jdk/pull/27352#discussion_r2360132337