RFR: 8356645: Javac should utilize new ZIP file system read-only access mode [v3]

[David Beaumont]

On Wed, 11 Jun 2025 05:45:48 GMT, Jan Lahoda <jlahoda at openjdk.org> wrote:

>> That's an excellent point. I will be sure to ask people if that looks acceptable and revert to the original behaviour otherwise. Thank you for spotting it and saying something.
>
> I think I would prefer to no send the multi release value for non-jar files - possibly there's no observable difference at this time, but the multi-release jar is for jars only.
> 
> (Also the comment above the variable seems a bit superfluous.)

Done. Though the more times I write `readOnlyJarFSEnv(null)` the more I think a no-arg version of that method might carry its weight.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25639#discussion_r2155432740