RFR: 8282444: Module finder incorrectly assumes default file system path-separator character [v3]

[Chris Hegarty]

> 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

Chris Hegarty has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - Merge branch 'openjdk:master' into modulefinder_separator_win
 - update copyright year
 - add tag with OrigBugId 8178380, and bugFixId 8282444
 - fix file separator in module finder with custom fs

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7632/files
  - new: https://git.openjdk.java.net/jdk/pull/7632/files/220c43c2..a7cbfd0c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7632&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7632&range=01-02

  Stats: 3764 lines in 134 files changed: 3088 ins; 449 del; 227 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7632.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7632/head:pull/7632

PR: https://git.openjdk.java.net/jdk/pull/7632