8277072: ObjectStreamClass caches keep ClassLoaders alive

[rkennke]

Hi all,

This pull request contains a backport of commit 8eb453ba from the openjdk/jdk repository.

The commit being backported was authored by Roman Kennke on 10 Dec 2021 and was reviewed by Roger Riggs and Peter Levart.

It fixes a memory leak in ObjectStreamClass under certain conditions. See bug for details.

Thanks!

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8277072: ObjectStreamClass caches keep ClassLoaders alive

Reviewers

• Roger Riggs (@RogerRiggs - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk18 pull/117/head:pull/117
$ git checkout pull/117

Update a local copy of the PR:
$ git checkout pull/117
$ git pull https://git.openjdk.java.net/jdk18 pull/117/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 117

View PR using the GUI difftool:
$ git pr show -t 117

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk18/pull/117.diff

[bridgekeeper]

👋 Welcome back rkennke! 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]

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

[openjdk]

@rkennke 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:

8277072: ObjectStreamClass caches keep ClassLoaders alive

Reviewed-by: rriggs

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[openjdk]

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

• core-libs

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[mlbridge]

Webrevs

• 00: Full (ecdf9361)

[rkennke]

Oops, I believe this should have been done vs jdk18u (not jdk18). Trying again.