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

[Jan Lahoda]

On Wed, 11 Jun 2025 10:27:18 GMT, David Beaumont <duke at openjdk.org> wrote:

>> For me: not relying on `assert` is preferred, esp. in tests. I.e. what is here currently seems good to me.
>
> But you would be okay with this assert, or just happy to shrug and leave it as read-write if it somehow wasn't a ZIP file system? Alternately we could do what I see done elsewhere and extract the ZIP file system provider and use it directly?

I think this test is verifying `ct.sym` is sensible, and we can extend that to make sure the file can be opened in the correct way. I.e., I would keep the check at this place as you did.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25639#discussion_r2141856934