8274232: Cleanup unnecessary null comparison before instanceof check in jdk.jdi

[turbanoff]

Update code checks both non-null and instance of a class in jdk.jdi module classes.
The checks and explicit casts could also be replaced with pattern matching for the instanceof operator.
Similar cleanups

1. JDK-8273484 java.naming
2. JDK-8258422 java.base

---

Progress

• Change must not contain extraneous whitespace
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Issue

• JDK-8274232: Cleanup unnecessary null comparison before instanceof check in jdk.jdi

Reviewers

• Chris Plummer (@plummercj - Reviewer)
• Serguei Spitsyn (@sspitsyn - Reviewer)

Reviewing

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$ git checkout pull/5659

Update a local copy of the PR:
$ git checkout pull/5659
$ git pull https://git.openjdk.java.net/jdk pull/5659/head

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$ git pr checkout 5659

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Download this PR as a diff file:
https://git.openjdk.java.net/jdk/pull/5659.diff

[bridgekeeper]

👋 Welcome back turbanoff! 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]

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[mlbridge]

Webrevs

• 00: Full (ad678f38)

[openjdk]

@turbanoff 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:

8274232: Cleanup unnecessary null comparison before instanceof check in jdk.jdi

Reviewed-by: cjplummer, sspitsyn

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 8 new commits pushed to the master branch:

• 5ba0d09: 8274205: Handle KDC_ERR_SVC_UNAVAILABLE error code from KDC
• 5a12af7: 8271880: Tighten condition for excluding regions from collecting cards with cross-references
• db23ecd: 8274191: Improve g1 evacuation failure injector performance
• d91e227: 8238274: (sctp) JDK-7118373 is not fixed for SctpChannel
• 971aa35: 8274083: Update testing docs to mention tiered testing
• 1d44014: 8273034: Make javadoc navigation collapsible on small displays
• bb74ae8: 8274171: java/nio/file/Files/probeContentType/Basic.java failed on "Content type" mismatches
• 56b8b35: 8273261: Replace 'while' cycles with iterator with enhanced-for in java.base

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
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.

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[sspitsyn]

Looks good.
Thanks,
Serguei

[turbanoff]

/integrate

[openjdk]

@turbanoff
Your change (at version ad678f3) is now ready to be sponsored by a Committer.

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@turbanoff 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!

[turbanoff]

keep open

[plummercj]

Are you just waiting for a sponsor?

[turbanoff]

Yep.

[plummercj]

/sponsor

[openjdk]

Going to push as commit db0c8d5.
Since your change was applied there have been 652 commits pushed to the master branch:

• 1830b8d: 8275056: Virtualize G1CardSet containers over heap region
• fe45835: 8274856: Failing jpackage tests with fastdebug/release build
• 9046077: 8276084: Linux DEB Bundler: release number in outputted .deb file should be optional
• 7fc344d: 8277028: Use service type documentation as fallback for @provides
• 35a831d: 8272170: Missing memory barrier when checking active state for regions
• 02f7900: 8276932: G1: Annotate methods with override explicitly in g1CollectedHeap.hpp
• fdcd16a: 8277048: Tiny improvements to the specification text for java.util.Properties.load
• b231f5b: 8276921: G1: Remove redundant failed evacuation regions calculation in RemoveSelfForwardPtrHRClosure
• ca2efb7: 8274687: JDWP deadlocks if some Java thread reaches wait in blockOnDebuggerSuspend
• 296780c: 8276983: Small fixes to DumpAllocStat::print_stats
• ... and 642 more: https://git.openjdk.java.net/jdk/compare/0aa63feca8704c8958530ef9e3df128570c50e12...master

Your commit was automatically rebased without conflicts.

[openjdk]

@plummercj @turbanoff Pushed as commit db0c8d5.

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