8058322: Zero name_index item of MethodParameters attribute cause MalformedParameterException.

[liach]

An out-of-spec behavior of core reflection causes it to fail when it encounters class files that conform to JVMS for release 8. In JVMS § 4.7.24 parameters are allowed to have null (CP reference 0) names, but core reflection didn't accept it.

This problem was relatively obscure, but it has been exacerbated when javac for release 21 and later starts generating such parameters in MethodParameters attribute. Since this is a problem with Java 8, I propose to backport this related fix onto 8 instead of changing latest releases.

This pull request contains a backport of commit cba5bd26 from the openjdk/jdk repository. The commit being backported was authored by Eric McCorkle on 11 Nov 2014 and was reviewed by Coleen Phillimore and David Holmes.

A backport request is included in the latest comment in the original JBS issue.

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Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8058322 needs maintainer approval

Issue

• JDK-8058322: Zero name_index item of MethodParameters attribute cause MalformedParameterException. (Bug - P4)

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk8u.git pull/63/head:pull/63
$ git checkout pull/63

Update a local copy of the PR:
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$ git pull https://git.openjdk.org/jdk8u.git pull/63/head

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$ git pr checkout 63

View PR using the GUI difftool:
$ git pr show -t 63

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https://git.openjdk.org/jdk8u/pull/63.diff

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[bridgekeeper]

👋 Welcome back liach! 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 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 and summary from the original commit.

[openjdk]

⚠️ @liach 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]

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