RFR: 8327180: Failed: java/io/ObjectStreamClass/ObjectStreamClassCaching.java#G1 [v2]

[Stefan Karlsson]

On Wed, 13 Mar 2024 19:41:25 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> The intermittent failure of ObjectStreamClassCaching is due to an incorrect assumption about GC behavior and a race condition.
>> 
>> Removed test based on incorrect assumptions about simultaneous clearing of WeakReferences.
>> Added a run of the test using ZGC, (previously omitted)
>
> Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove obsolete note; no longer disabled

Changes requested by stefank (Reviewer).

test/jdk/java/io/ObjectStreamClass/ObjectStreamClassCaching.java line 57:

> 55:  * @library /test/lib/
> 56:  * @summary ObjectStreamClass caches keep ClassLoaders alive (ZGC)
> 57:  * @run testng/othervm -Xmx64m -XX:+UseZGC ObjectStreamClassCaching

This test is meant to run with Generational ZGC (according to the requires line). It needs to run with `-XX:+UseZGC -XX:+ZGenerational` to enable Generational ZGC. If you run with `-XX:+UseZGC` you get the older, non-generational ZGC.

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PR Review: https://git.openjdk.org/jdk/pull/18284#pullrequestreview-1935079550
PR Review Comment: https://git.openjdk.org/jdk/pull/18284#discussion_r1523833917