8354466: Open some misc Swing bugs 9

[satyenme]

Backporting JDK-8354466: Open some misc Swing bugs 9. Adds a JSplitPane and JPasswordField test. Ran GHA Sanity Checks and new tests directly. Patch is clean. Backporting for parity with Oracle.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8354466 needs maintainer approval

Issue

• JDK-8354466: Open some misc Swing bugs 9 (Bug - P4 - Approved)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/2409/head:pull/2409
$ git checkout pull/2409

Update a local copy of the PR:
$ git checkout pull/2409
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/2409/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2409

View PR using the GUI difftool:
$ git pr show -t 2409

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/2409.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back ssubramaniam! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

@satyenme 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:

8354466: Open some misc Swing bugs 9

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 8 new commits pushed to the master branch:

• 21fcec0: 8325530: Vague error message when com.sun.tools.attach.VirtualMachine fails to load agent library
• ff99698: 8300708: Some nsk jvmti tests fail with virtual thread wrapper due to jvmti missing some virtual thread support
• 3d90a9b: 8309511: Regression test ExtraImportSemicolon.java refers to the wrong bug
• ... and 5 more: https://git.openjdk.org/jdk21u-dev/compare/38fd5695623f4a8e75e97137ff3adb064d200dcd...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]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

⚠️ @satyenme This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (340be050)

[satyenme]

/approval request for backport of JDK-8354466: Open some misc Swing bugs 9

Motivation: With this change, we provide additional test coverage without changing any functionality (so minimal risk). Change will bring openjdk closer to matching oracle.

Risk: Low. Ran GHA Sanity Checks and new manual tests. Patch is clean. Although change has only been present in tip since April, 2025, change has been accepted by Oracle (and tests were previously closed source).

[openjdk]

@satyenme
8354466: The approval request has been created successfully.

[satyenme]

/integrate

[openjdk]

Going to push as commit aa0e9e7.
Since your change was applied there have been 22 commits pushed to the master branch:

• 34a5b87: 8306579: Consider building with /Zc:throwingNew
• 32bb1bf: 8307160: Fix AWT/2D/A11Y to support the permissive- flag on the Microsoft Visual C compiler
• 6a9bd77: 8364660: ClassVerifier::ends_in_athrow() should be removed
• ... and 19 more: https://git.openjdk.org/jdk21u-dev/compare/38fd5695623f4a8e75e97137ff3adb064d200dcd...master

Your commit was automatically rebased without conflicts.

[openjdk]

@satyenme Pushed as commit aa0e9e7.

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