RFR: 8364761: (aio) AsynchronousChannelGroup.execute doesn't check null command [v2]

[Brian Burkhalter]

On Sat, 9 Aug 2025 07:51:44 GMT, Volkan Yazici <vyazici at openjdk.org> wrote:

> This test can be migrated to JUnit [...].

So changed in d5d9665. While the test is cleaner now, I have to note that while testing this before creating the PR, it was actually easier to use the test outside of jtreg completely as it is quite simple and required no framework.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26709#discussion_r2267305355