8369226: GHA: Switch to MacOS 15

[shipilev]

Current GHA workflows for MacOS are running with:

• x86_64: macos-13, builds only
• aarch64: macos-14, builds+tests

GitHub is deprecating MacOS 13 runner on December 4th, 2025, the brownouts are starting in a month: actions/runner-images#13046. Additionally, GHA phases out MacOS x86_64, and MacOS 15 would be the last runner for x86_64. We have already disabled testing jobs for MacOS x86_64. GitHub recommends migrating to MacOS 15 at this time.

We can switch to MacOS 15 runner for both x86 and AArch64 to keep pipelines green in the coming months.

Additional testing:

• GHA

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8369226: GHA: Switch to MacOS 15 (Enhancement - P4)

Reviewers

• Erik Joelsson (@erikj79 - Reviewer)
• Albert Mingkun Yang (@albertnetymk - Reviewer)
• Severin Gehwolf (@jerboaa - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/27655/head:pull/27655
$ git checkout pull/27655

Update a local copy of the PR:
$ git checkout pull/27655
$ git pull https://git.openjdk.org/jdk.git pull/27655/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 27655

View PR using the GUI difftool:
$ git pr show -t 27655

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/27655.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

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[openjdk]

@shipilev This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8369226: GHA: Switch to MacOS 15

Reviewed-by: erikj, ayang, sgehwolf

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 15 new commits pushed to the master branch:

• 4b4d0cd: 8365398: TEST_BUG: java/rmi/transport/checkLeaseInfoLeak/CheckLeaseLeak.java failing intermittently
• 9c46feb: 8245234: Still seeing missing mixed stack traces, even after JDK-8234624
• 6bec42a: 8368892: Make JEditorPane/TestBrowserBGColor.java headless
• ... and 12 more: https://git.openjdk.org/jdk/compare/baf8bc5701c43425e3345f82d4318b134b26d7c9...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[openjdk]

@shipilev The following label will be automatically applied to this pull request:

• build

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing list. If you would like to change these labels, use the /label pull request command.

[mlbridge]

Webrevs

• 00: Full (6961fa42)

[shipilev]

Thanks for reviews, here we go. I'll let it linger in mainline before proposing backports. Hopefully, we will get backports in with time to spare before brownouts start.

/integrate

[openjdk]

Going to push as commit 1ea8cfa.
Since your change was applied there have been 22 commits pushed to the master branch:

• ebeb77b: 8358058: sun/java2d/OpenGL/DrawImageBg.java Test fails intermittently
• 4ca3ab6: 8369123: Still more small Float16 refactorings
• eb835e0: 8366040: Change URL.lookupViaProviders to use ScopedValue to detect recursive lookup
• ... and 19 more: https://git.openjdk.org/jdk/compare/baf8bc5701c43425e3345f82d4318b134b26d7c9...master

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev Pushed as commit 1ea8cfa.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.