RFR: 8370975: Test runtime/ErrorHandling/AccessZeroNKlassHitsProtectionZone.java can still fail on macos 26

[Stefan Karlsson]

On Thu, 30 Oct 2025 22:53:59 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> In the previous fix (https://github.com/openjdk/jdk/pull/28035), I added `OutputAnalyzer::match(String regexp)`, but it didn't work because by default regular expressions do not match across newlines.
> 
> I fixed this by re-working `OutputAnalyzer::match()`, etc, to use `Pattern.MULTILINE`.
> 
> I tried rerunning the test on macos 26 but couldn't reproduce the condition in the bug report. However, I added sanity test in this version (https://github.com/openjdk/jdk/commit/e690e97262575d083017635fa837ab267686bfe9) and the new regexp seems to catch the output and correctly come to this part of the test case:
> 
> 
> if (forceBase >= end) {
>     throw new SkippedException("Failed to force ccs to any of the given bases. Skipping test.");
> }

I'm skeptical to adding MULTILINE to all users of these regex functions. And with that said, something is fishy here. Why do you need to match over multiple lines? I see that the bug report makes it look like you have multiple lines, but the linked output from the test doesn't have them. Could you give a more comprehensive explanation what this solves?

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PR Comment: https://git.openjdk.org/jdk/pull/28077#issuecomment-3471601865