JDK-8292060: Make ClassFileVersionTest.java version adapting

[jddarcy]

The goal of this update is to allow ClassFileVersionTest.java to be modified less often while still testing class files of the latest version.

Since the build policy of the JDK is to use the latest source and target, the class files in the java.base module will have the latest major version. By having the test file itself reference a preview API, its class file will have a nonzero minor version. (Simply compiling under "--enable-preview -source ${jdk.version}" is not sufficient to cause the minor version bits to be set.)

As written, the test now only need to be updated when the referenced API goes non-preview as opposed needing to be updated for every feature release.

After JDK-8289106 is fixed, setting latestMajor can be changed to something like

ClassFileFormatVersion.latest().major()

---

Progress

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Issue

• JDK-8292060: Make ClassFileVersionTest.java version adapting

Reviewers

• Harold Seigel (@hseigel - Reviewer)

Reviewing

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Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk pull/9796/head:pull/9796
$ git checkout pull/9796

Update a local copy of the PR:
$ git checkout pull/9796
$ git pull https://git.openjdk.org/jdk pull/9796/head

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Checkout this PR locally:
$ git pr checkout 9796

View PR using the GUI difftool:
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Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/9796.diff

[bridgekeeper]

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[openjdk]

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

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[mlbridge]

Webrevs

• 00: Full (999cee61)

[hseigel]

Changes look good. Thanks!

[openjdk]

@jddarcy 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:

8292060: Make ClassFileVersionTest.java version adapting

Reviewed-by: hseigel

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 25 new commits pushed to the master branch:

• 4040927: 8290047: (fs) FileSystem.getPathMatcher does not check for ":" at last index
• 8d0d9ea: 8291238: JDK can't be built without G1
• aff7689: 8292075: Remove deleted test compiler/rangechecks/TestRangeCheckHoistingScaledIV.java from ProblemList
• 3677b55: 6391806: JLabel and AbstractButton's imageUpdate method should be better specified
• 0ade264: 8290814: Hide G1RootRegions behind G1ConcurrentMark
• f5b3618: 8291970: Add TableStatistics get function to ResourceHashtable
• cbc9040: 8290278: JavaDoc of index parameter of method JTabbedPane.insertTab
• 2712bc3: 8289741: Remove unused imports from DTDBuilder.java
• af243ca: 8265433: IGV: add graph tooltips with properties
• 7739843: 8288633: The ICC_ColorSpace.fromCIEXYZ method uses the wrong rendering intent
• ... and 15 more: https://git.openjdk.org/jdk/compare/ae52053757ca50c4b56989c9b0c6890e504e4088...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this 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.

[jddarcy]

/integrate

[jddarcy]

/integrate

[openjdk]

Going to push as commit ae1a9a0.
Since your change was applied there have been 25 commits pushed to the master branch:

• 4040927: 8290047: (fs) FileSystem.getPathMatcher does not check for ":" at last index
• 8d0d9ea: 8291238: JDK can't be built without G1
• aff7689: 8292075: Remove deleted test compiler/rangechecks/TestRangeCheckHoistingScaledIV.java from ProblemList
• 3677b55: 6391806: JLabel and AbstractButton's imageUpdate method should be better specified
• 0ade264: 8290814: Hide G1RootRegions behind G1ConcurrentMark
• f5b3618: 8291970: Add TableStatistics get function to ResourceHashtable
• cbc9040: 8290278: JavaDoc of index parameter of method JTabbedPane.insertTab
• 2712bc3: 8289741: Remove unused imports from DTDBuilder.java
• af243ca: 8265433: IGV: add graph tooltips with properties
• 7739843: 8288633: The ICC_ColorSpace.fromCIEXYZ method uses the wrong rendering intent
• ... and 15 more: https://git.openjdk.org/jdk/compare/ae52053757ca50c4b56989c9b0c6890e504e4088...master

Your commit was automatically rebased without conflicts.

[openjdk]

@jddarcy Pushed as commit ae1a9a0.

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

[openjdk]

@jddarcy The command integrate can only be used in open pull requests.

[dholmes-ora]

@jddarcy please note that hotspot changes, including tests, are subject to a two review rule.

I'm not sure this makes that much difference versus editing the jcod file. Can we define a fake preview class to use instead?

[dholmes-ora]

This potentially will need changing on each release so doesn't really make the test more stable.