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/jdk18u pull/36/head:pull/36
$ git checkout pull/36

Update a local copy of the PR:
$ git checkout pull/36
$ git pull https://git.openjdk.java.net/jdk18u pull/36/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 36

View PR using the GUI difftool:
$ git pr show -t 36

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk18u/pull/36.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

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 no new commits pushed to the master branch. If another commit should be pushed before you perform the /integrate command, your PR will be automatically rebased. If you prefer to avoid any potential 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.

[mlbridge]

Webrevs

• 00: Full (35910ff6)

[rkennke]

/integrate

[openjdk]

Going to push as commit 76e25e6.
Since your change was applied there have been 11 commits pushed to the master branch:

• 73014a2: 8282444: Module finder incorrectly assumes default file system path-separator character
• 7bdf94b: 8282583: Update BCEL md to include the copyright notice
• c66544f: 8281168: Micro-optimize VarForm.getMemberName for interpreter
• 6b5706a: 8279668: x86: AVX2 versions of vpxor should be asserted
• 9089b94: 8279958: Provide configure hints for Alpine/apk package managers
• 92d2de6: 8282225: GHA: Allow one concurrent run per PR only
• 8fd1a9e: 8283017: GHA: Workflows break with update release versions
• defa9e8: 8281615: Deadlock caused by jdwp agent
• 507cbd6: 8282295: SymbolPropertyEntry::set_method_type fails with assert
• 6bebb34: 8283037: Update jdk18u fix version to 18.0.2
• ... and 1 more: https://git.openjdk.java.net/jdk18u/compare/9bd2fc6d5824461ebac38d3ec77eee43eaa29595...master

Your commit was automatically rebased without conflicts.

[openjdk]

@rkennke Pushed as commit 76e25e6.

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