8319436: Proxy.newProxyInstance throws NPE if loader is null and interface not visible from class loader

[benty-amzn]

Clean backport of JDK-8319436 to resolve a regression introduced in 11.0.20.
Included test passes locally on linux x64 after the update to jtreg-7.3.1

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8319436 needs maintainer approval

Issue

• JDK-8319436: Proxy.newProxyInstance throws NPE if loader is null and interface not visible from class loader (Bug - P3)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk11u-dev.git pull/2454/head:pull/2454
$ git checkout pull/2454

Update a local copy of the PR:
$ git checkout pull/2454
$ git pull https://git.openjdk.org/jdk11u-dev.git pull/2454/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2454

View PR using the GUI difftool:
$ git pr show -t 2454

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk11u-dev/pull/2454.diff

Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back btaylor! 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]

⚠️ @benty-amzn 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 (e5e9cf8c)

[bridgekeeper]

@benty-amzn This pull request has been inactive for more than 4 weeks and will be automatically closed if another 4 weeks passes without any activity. To avoid this, simply add a new comment to the pull request. Feel free to ask for assistance if you need help with progressing this pull request towards integration!

[bridgekeeper]

@benty-amzn This pull request has been inactive for more than 8 weeks and will now be automatically closed. If you would like to continue working on this pull request in the future, feel free to reopen it! This can be done using the /open pull request command.

[GoeLin]

Hi @benty-amzn, will you continue on this?

[benty-amzn]

I'll continue on this after #2612 is merged, which will prevent the need to rewrite the included junit test

[GoeLin]

That makes sense, thanks!

[benty-amzn]

/open

[benty-amzn]

Seems the bot doesn't want to reopen this, so I've created #2619 instead