RFR: 8318839: Update test thread factory to catch all exceptions

[Leonid Mesnik]

On Thu, 26 Oct 2023 08:34:39 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> Stepping back a bit. ThreadGroup is legacy and we eventually want it to go away. We've been deprecating and degrading it very slowly over many releases. So I think jtreg will eventually need to change. Right now, it creates AgentVMThreadGroup for agent VM mode so it controls the UHE where it starts the "main thread". I think it will eventually need to change this to set the system-wide UHE but this means it would handling uncaught exception thrown by "system threads", we may have to audit some of the exception handling if things come out of the woodwork.

I think we shouldn't allow any unhandled exceptions in system threads also. This might just hide issues. The tests that might erase such exceptions should be written to for VM.

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PR Comment: https://git.openjdk.org/jdk/pull/16369#issuecomment-1782033148