RFR: 8361715: (bf) Improve java/nio/Buffer/GetChars.java and migrate to JUnit

[Brian Burkhalter]

On Mon, 14 Jul 2025 12:40:18 GMT, Brett Okken <duke at openjdk.org> wrote:

> The getChars test does fail when run with builds of jdk 25 prior to the fix for https://bugs.openjdk.org/browse/JDK-8361299.

Good, that is expected.

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PR Comment: https://git.openjdk.org/jdk/pull/26282#issuecomment-3071139780