8351230: Collections.synchronizedList returns a list that is not thread-safe

[cost0much]

Clean backport

---

Progress

• Change must not contain extraneous whitespace
• JDK-8351230 needs maintainer approval
• Commit message must refer to an issue

Issue

• JDK-8351230: Collections.synchronizedList returns a list that is not thread-safe (Bug - P3)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/2541/head:pull/2541
$ git checkout pull/2541

Update a local copy of the PR:
$ git checkout pull/2541
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/2541/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2541

View PR using the GUI difftool:
$ git pr show -t 2541

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/2541.diff

[bridgekeeper]

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[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

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