RFR: 7903671: jcstress: Update buffer tests for JDK-8318966

[Jiří Vaněk]

On Wed, 26 Feb 2025 17:50:28 GMT, Jiří Vaněk <jvanek at openjdk.org> wrote:

> part 1:  Detecting jdk of target VM and exuding illegible tests
> 
> This is prequel to full fixing of CODETOOLS-7903671. This PR detects target JDK version and then disables illegible tests.
> part 2 will be done in templates of affected tests and logic around generating the classes from them. In meantime this should server.
> 
> The jdk detection will be most likely used anyway. WDYT? If we agree on similar approach, I will create a new bug for this PR only.

hi! Thanx a lot for eyball!

If this should be the way, that  I would rather run it with `alignment 1` then stay with error.  The error seem redundant here.  JCStress is doing a lot of checks, and the final runs are based on this. Checking the java version or ByteBuffer impl seems more reasonable.. However as far as I can tell, the  `alignment 1` is not triggering the parts it was with 8 and thus not testing what it should.

Sorry to say that, but I have doubts that the ByteBuffer tests are handled as soft errors. If that would be the case I think I would not bother with PR. "api mismatch" would be good enough. But as you know much better, I will try and elaborate.   If they are not returning `api mismatch`, then I will elaborate in this PR so they start to return `api mismatch`.

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

PR Comment: https://git.openjdk.org/jcstress/pull/159#issuecomment-2949603340