8282444: Module finder incorrectly assumes default file system path-separator character #7632

ChrisHegarty · 2022-02-28T11:12:17Z

The module finder implementation incorrectly uses the path-separator
character from the default file system, when mapping the relative path
of an entry in an exploded module to a package name. This causes
problems on Windows [*] when using a module finder with a custom file
system that has a path-separator character that differs from that of the
default file system, e.g. the zip file system (which uses '/',
rather than '\' ).

Rather than adding a new test for this, I deciced to just modify an
existing one. The existing test exercises the module finder with a
custom file system, but does so with modules have trivial single-level
packages names. I just expanded the module to have a subpackage. This
is sufficient to reproduce the bug, and verify the fix.

[*]

java.lang.module.FindException: Error reading module: /m2
        at java.base/jdk.internal.module.ModulePath.readModule(ModulePath.java:350)
        at java.base/jdk.internal.module.ModulePath.scanDirectory(ModulePath.java:284)
        at java.base/jdk.internal.module.ModulePath.scan(ModulePath.java:232)
        at java.base/jdk.internal.module.ModulePath.scanNextEntry(ModulePath.java:190)
        at java.base/jdk.internal.module.ModulePath.findAll(ModulePath.java:166)
        at ModulesInCustomFileSystem.listAllModules(ModulesInCustomFileSystem.java:108)
        at ModulesInCustomFileSystem.testZipFileSystem(ModulesInCustomFileSystem.java:97)
        at ModulesInCustomFileSystem.testExplodedModulesInZipFileSystem(ModulesInCustomFileSystem.java:68)
        at ...
Caused by: java.lang.module.InvalidModuleDescriptorException: Package q.r not found in module
        at java.base/jdk.internal.module.ModuleInfo.invalidModuleDescriptor(ModuleInfo.java:1212)
        at java.base/jdk.internal.module.ModuleInfo.doRead(ModuleInfo.java:330)
        at java.base/jdk.internal.module.ModuleInfo.read(ModuleInfo.java:129)
        at java.base/jdk.internal.module.ModulePath.readExplodedModule(ModulePath.java:689)
        at java.base/jdk.internal.module.ModulePath.readModule(ModulePath.java:320)
        ... 36 more

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Issue

JDK-8282444: Module finder incorrectly assumes default file system path-separator character

Reviewers

Alan Bateman (@AlanBateman - Reviewer) ⚠️ Review applies to 220c43c

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bridgekeeper · 2022-02-28T11:12:43Z

👋 Welcome back chegar! 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 · 2022-02-28T11:16:25Z

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

core-libs

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mlbridge · 2022-02-28T11:20:18Z

Webrevs

AlanBateman · 2022-02-28T14:34:43Z

The update to ModulePath looks okay. The tests for ModulePath with paths to locate files in custom file systems are somewhat minimal and probably should be expanded to ensure that there aren't any other issues. Updating the existing ModulesInCustomFileSystem test to use a deeper package structure is subtle but okay for now but we should create another issue to create more tests for custom file systems. I assume you'll update the date in the copyright header of the changed files.

dfuch

Hi Chris, maybe you should add @bug 8282444 to ModulesInCustomFileSystem.java too?

AlanBateman · 2022-02-28T16:18:36Z

Hi Chris, maybe you should add @bug 8282444 to ModulesInCustomFileSystem.java too?

The downside is that it would make it look like the test was added fro this issue. I think it only works if the original issue for the module system implementation is there too.

ChrisHegarty · 2022-02-28T16:38:01Z

we should create another issue to create more tests for custom file systems.

Yeah, that's a good point. I'll take a closer look at this and see how best to expand the coverage (separately).

I assume you'll update the date in the copyright header of the changed files.

Done.

Hi Chris, maybe you should add @bug 8282444 to ModulesInCustomFileSystem.java too?

The downside is that it would make it look like the test was added fro this issue. I think it only works if the original issue for the module system implementation is there too.

I added a tag with both the original bugId that introduced the test, 8178380, and bug Fix Id for this issue, 8282444.

openjdk · 2022-02-28T18:52:16Z

@ChrisHegarty 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:

8282444: Module finder incorrectly assumes default file system path-separator character

Reviewed-by: alanb

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 no new commits pushed to the master branch. If another commit should be pushed before you perform the /integrate command, your PR will be automatically rebased. If you prefer to avoid any potential 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.

dfuch

Not an expert of the area but the proposed changes look good to me.

ChrisHegarty · 2022-03-01T10:36:29Z

/integrate

openjdk · 2022-03-01T10:37:49Z

Going to push as commit 369291b.
Since your change was applied there have been 3 commits pushed to the master branch:

d4d12ad: 8282047: Enhance StringDecode/Encode microbenchmarks
22b93a3: 8282094: [REDO] Parallel: Refactor PSCardTable::scavenge_contents_parallel
d3022f8: 8282467: add extra diagnostics for JDK-8268184

Your commit was automatically rebased without conflicts.

openjdk · 2022-03-01T10:38:08Z

@ChrisHegarty Pushed as commit 369291b.

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

fix file separator in module finder with custom fs

ca6cdf4

openjdk bot added the rfr Pull request is ready for review label Feb 28, 2022

openjdk bot added the core-libs core-libs-dev@openjdk.org label Feb 28, 2022

dfuch reviewed Feb 28, 2022

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ChrisHegarty added 2 commits February 28, 2022 16:34

add tag with OrigBugId 8178380, and bugFixId 8282444

093ec61

update copyright year

220c43c

AlanBateman approved these changes Feb 28, 2022

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openjdk bot added the ready Pull request is ready to be integrated label Feb 28, 2022

Merge branch 'openjdk:master' into modulefinder_separator_win

a7cbfd0

dfuch reviewed Mar 1, 2022

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openjdk bot added the integrated Pull request has been integrated label Mar 1, 2022

openjdk bot closed this Mar 1, 2022

openjdk bot removed ready Pull request is ready to be integrated rfr Pull request is ready for review labels Mar 1, 2022

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