RFR: 8283276: java/io/ObjectStreamClass/ObjectStreamClassCaching.java fails with various GCs

[Aleksey Shipilev]

On Fri, 22 Jul 2022 10:36:32 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> WhiteBox has a number of methods that allow better control over GC, e.g. fullGC(), concurrentGCRunToIdle(), etc. Would that help?

I think the test relies on assumption that `System.gc()` does the weak reference clearing. Which is not given, for example if concurrent GC cycle is triggered without weak refs processing. I don't think we can solve this with GC control, unless we hack into the each of the GC's policies with Whitebox...

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PR: https://git.openjdk.org/jdk/pull/9533