8264048: Fix caching in Jar URL connections when an entry is missing

[AlekseiEfimov]

Current fix tries to tackle an issue with URL connection referencing non-existing Jar file entries:
If an entry that doesn't exist is specified in an URL connection the underlying Jar file is still cached even if an exception is thrown after that. Such behavior prevents the caller, for instance, a URLClassLoader, from closing a Jar file.

The proposed fix checks if entry exists before caching a Jar file (only for cases with enabled caching):

• If entry exists - jar file is cached if it wasn't cached before
• If entry doesn't exist and jar file wasn't cached before - jar file is closed and exception is thrown
• If entry doesn't exist and jar file was cached before - jar file is kept cached and exception is thrown

The following tests have been used to verify the fix:

• New regression tests
• :jdk_core: tests
• api/java_util,api/java_net JCK tests

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JDK-8264048: Fix caching in Jar URL connections when an entry is missing

Reviewers

• Brent Christian (@bchristi-git - Reviewer)
• Daniel Fuchs (@dfuch - Reviewer)

Contributors

• Daniel Fuchs <dfuchs@openjdk.org>

Reviewing

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Checkout this PR locally:
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$ git checkout pull/3263

Update a local copy of the PR:
$ git checkout pull/3263
$ git pull https://git.openjdk.java.net/jdk pull/3263/head

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Checkout this PR locally:
$ git pr checkout 3263

View PR using the GUI difftool:
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Download this PR as a diff file:
https://git.openjdk.java.net/jdk/pull/3263.diff

[bridgekeeper]

👋 Welcome back aefimov! 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]

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

• core-libs
• net

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[mlbridge]

Webrevs

• 01: Full - Incremental (2f0fa527)
• 00: Full (6aeb333)

[dfuch]

Hi Aleksei, thanks for putting this together.

test/jdk/sun/misc/URLClassPath/RemoveJar.java seems to be an older version of test/jdk/java/net/URLClassLoader/RemoveJar.java. The two tests are almost identical - so test/jdk/sun/misc/URLClassPath/RemoveJar.java can probably be removed from the PR.

Otherwise the proposed changes look good to me.

[AlekseiEfimov]

Thanks for the review, Daniel. It is correct that test/jdk/sun/misc/URLClassPath/RemoveJar.java is an old version. It is removed now.

[bchristi-git]

Hi, Aleksei. The change looks good.

[openjdk]

@AlekseiEfimov 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:

8264048: Fix caching in Jar URL connections when an entry is missing

Co-authored-by: Daniel Fuchs <dfuchs@openjdk.org>
Reviewed-by: bchristi, dfuchs

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 87 new commits pushed to the master branch:

• eb6330e: 8264047: Duplicate global variable 'jvm' in libjavajpeg and libawt
• 8132548: 8264359: Compiler directives should enable DebugNonSafepoints when PrintAssembly is requested
• ec7b002: 8264626: C1 should be able to inline excluded methods
• ff22353: 8264565: Templatize num_arguments() functions of DCmd subclasses
• 54b4070: 8264634: CollectCLDClosure collects duplicated CLDs when dumping dynamic archive
• 43d4a6f: 8264564: AArch64: use MOVI instead of FMOV to zero FP register
• dc608fd: 8264411: serviceability/jvmti/HeapMonitor tests intermittently fail due to large TLAB size
• b1a225e: 8263565: NPE was thrown when sun.jvm.hotspot.rmi.serverNamePrefix was set
• c41cd15: 8264686: ClhsdbTestConnectArgument.java should use SATestUtils::validateSADebugDPrivileges
• b7baca7: 8264288: Performance issue with MethodHandle.asCollector
• ... and 77 more: https://git.openjdk.java.net/jdk/compare/f3726a87007f2ec40ff961824f6efe99862284d8...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.

[AlekseiEfimov]

/contributor add dfuchs

[openjdk]

@AlekseiEfimov
Contributor Daniel Fuchs <dfuchs@openjdk.org> successfully added.

[AlekseiEfimov]

/integrate

[openjdk]

@AlekseiEfimov Since your change was applied there have been 88 commits pushed to the master branch:

• bf26a25: 8264027: Refactor "CLEANUP" region printing
• eb6330e: 8264047: Duplicate global variable 'jvm' in libjavajpeg and libawt
• 8132548: 8264359: Compiler directives should enable DebugNonSafepoints when PrintAssembly is requested
• ec7b002: 8264626: C1 should be able to inline excluded methods
• ff22353: 8264565: Templatize num_arguments() functions of DCmd subclasses
• 54b4070: 8264634: CollectCLDClosure collects duplicated CLDs when dumping dynamic archive
• 43d4a6f: 8264564: AArch64: use MOVI instead of FMOV to zero FP register
• dc608fd: 8264411: serviceability/jvmti/HeapMonitor tests intermittently fail due to large TLAB size
• b1a225e: 8263565: NPE was thrown when sun.jvm.hotspot.rmi.serverNamePrefix was set
• c41cd15: 8264686: ClhsdbTestConnectArgument.java should use SATestUtils::validateSADebugDPrivileges
• ... and 78 more: https://git.openjdk.java.net/jdk/compare/f3726a87007f2ec40ff961824f6efe99862284d8...master

Your commit was automatically rebased without conflicts.

Pushed as commit a611c46.

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