JDK-8284858: Start of release updates for JDK 20

[jddarcy]

Time to start getting ready for JDK 20...

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issues

• JDK-8284858: Start of release updates for JDK 20
• JDK-8286035: Add source 20 and target 20 to javac
• JDK-8286034: Add SourceVersion.RELEASE_20

Reviewers

• David Holmes (@dholmes-ora - Reviewer) ⚠️ Review applies to 54e872b5
• Kevin Rushforth (@kevinrushforth - Author) ⚠️ Review applies to 96be1787
• Iris Clark (@irisclark - Reviewer)
• Erik Joelsson (@erikj79 - Reviewer) ⚠️ Review applies to 96be1787
• Jonathan Gibbons (@jonathan-gibbons - Reviewer) ⚠️ Review applies to eedd36bd
• Magnus Ihse Bursie (@magicus - Reviewer) ⚠️ Review applies to e495a579

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk pull/8236/head:pull/8236
$ git checkout pull/8236

Update a local copy of the PR:
$ git checkout pull/8236
$ git pull https://git.openjdk.java.net/jdk pull/8236/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 8236

View PR using the GUI difftool:
$ git pr show -t 8236

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk/pull/8236.diff

[bridgekeeper]

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[openjdk]

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

• build
• compiler
• core-libs
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[jonathan-gibbons]

langtools files look OK, although I did skim through the auto-generated new data/symbols files.

There are possibilities in the langtools file to simplify naming and default initialization of member fields in various places, in a separate PR, separate from these changes.

[dholmes-ora]

Updates look good. Thanks

[irisclark]

Changes still look good.

[magicus]

Build changes look good. Thanks for fixing the bug in generate-symbol-data.sh.

[jddarcy]

/integrate defer

[openjdk]

@jddarcy Integration of this pull request has been deferred and may be completed by any project committer using the /integrate pull request command.

[erikj79]

/integrate

[openjdk]

Going to push as commit edff51e.
Since your change was applied there have been 14 commits pushed to the master branch:

• 2671443: 8286171: HttpClient/2 : Expect:100-Continue blocks indefinitely when response is not 100
• 59b0de6: 8288048: Build failure with GCC 6 after JDK-8286562
• db4405d: 8288078: linux-aarch64-optimized build fails in Tier5 after JDK-8287567
• 7e948f7: 8287903: Reduce runtime of java.math microbenchmarks
• 3fa9984: 8287854: Dangling reference in ClassVerifier::verify_class
• 4285e3d: 8288023: AArch64: disable PAC-RET when preview is enabled
• 560e292: 8287738: [PPC64] jdk/incubator/vector/*VectorTests failing
• e5b56ba: 8288040: x86: Loom: Improve cont/monitor-count helper methods
• 5a89cb0: 6429812: NPE after calling JTable.updateUI() when using a header renderer + XP L&F
• bc28bae: 8287897: Augment src/jdk.internal.le/share/legal/jline.md with information on 4th party dependencies
• ... and 4 more: https://git.openjdk.org/jdk/compare/a941bc2de674fdd77cdbbdf3641309fc39bfc0c4...master

Your commit was automatically rebased without conflicts.

[openjdk]

@erikj79 Pushed as commit edff51e.

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