RFR: 8308429: jvmti/StopThread/stopthrd007 failed with "NoClassDefFoundError: Could not initialize class jdk.internal.misc.VirtualThreads" [v2]

[Leonid Mesnik]

> The test fails because ThreadDeath is raised during class jdk.internal.misc.VirtualThreads initialization. The proposed fix is to pre-initialize this step to avoid such failures. See more details in the bug.
> I reproduced the original problem and verified that it is not reproduced after fix. 
> Tested with tier5 and running nsk/jvmti tests with and without virtual test thread factory.
> 
> I don't think that more complex fix is needed. There is a plan to review nsk/jvmti stopThread tests and see if 
> ./serviceability/jvmti/vthread/StopThreadTest/StopThreadTest.java 
> might be improved to cover them.

Leonid Mesnik has updated the pull request incrementally with one additional commit since the last revision:

  missed import added.

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/15966/files
  - new: https://git.openjdk.org/jdk/pull/15966/files/604c817f..fe194417

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15966&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15966&range=00-01

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15966.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15966/head:pull/15966

PR: https://git.openjdk.org/jdk/pull/15966