[jdk20u] RFR: 8300575: JVMTI support when using alternative virtual thread implementation

[Alan Bateman]

On Mon, 24 Apr 2023 18:12:44 GMT, Tyler Steele <tsteele at openjdk.org> wrote:

> Things get a bit cryptic when discussing the conformance tests, so feel free to reach out via email if you find my response is not providing the detail you're looking for.
> 
> > Are you sure this is needed[?] JVMTI is optional...
> 
> Basically, yes I'm sure. And, we've received guidance on one of the mailing lists that backporting this change is a possible solution to the difficulty we are facing.
> 
> > ... and a build with the alt implementation doesn't support JVMTI with --enable-preview.
> 
> Unless I've misunderstood your comment. Yes, but the changes I'm backporting are meant to enable it.

The changes in JDK-8300575 are not needed in JDK 20u. Non objection to backporting the change but my guess is there is some confusion somewhere that an implementation is not required to support JVMTI. In this case, JVMTI is not supported in JDK 19/20 when using the alternative implementation of virtual threads and when running with --enable-preview.

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PR Comment: https://git.openjdk.org/jdk20u/pull/60#issuecomment-1520671703