RFR: 8304367: jlink --include-locales=* attempts to parse non .class resource files with classfile reader

[Lance Andersen]

On Thu, 16 Mar 2023 20:43:38 GMT, Naoto Sato <naoto at openjdk.org> wrote:

> This is a blocker for [JDK-8294972](https://bugs.openjdk.org/browse/JDK-8294972). The fix is to weed out non-class files for calling `ClassReader` by checking the file extension. Regression tests are not provided as it is not possible to detect the fix from the artifact jimage, but manually confirmed it would effectively weed out `LineBreakIteratorData_th`, `WordBreakIteratorData_th`, and `thai_dict` files by running `IncludeLocalesPluginTest.java`.

Marked as reviewed by lancea (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/13067