RFR: 8367859: Remove shell script from nio exception gensrc

[Brian Burkhalter]

On Wed, 17 Sep 2025 16:02:23 GMT, Naoto Sato <naoto at openjdk.org> wrote:

> > Alternatively, maybe we should just check into the exceptions in the src tree and avoid this. @naotoj @bplb, can you provide some opinion on this?
> 
> I agree. Since those exceptions are not likely to change, It would be easier to maintain just to check-in those generated sources into the repository.

I concur. Given that the only change since JDK 8 is this

59c59
<  * <tt>put</tt> or <tt>compact</tt> is invoked upon a read-only buffer." \
---
>  * <code>put</code> or <code>compact</code> is invoked upon a read-only buffer." \

these are pretty stable.

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PR Comment: https://git.openjdk.org/jdk/pull/27338#issuecomment-3304544038