[lworld] RFR: 8376461: [lworld] serviceability/jvmti/valhalla/HeapDump/HeapDump.java fails More than 1 instances of 'TestClass' found

[Chris Plummer]

On Fri, 13 Feb 2026 21:20:23 GMT, Alex Menkov <amenkov at openjdk.org> wrote:

> TestClass is a container class which contains a number of value object, main test process and target VM create TestClass object, so the test can compare the object and its representation in the target VM heap dump.
> After JDK-8376135 `new TestClass()` may cause unreachable TestClass instance is still in the heap, so it appears in the heap dump too.
> The simplest solution is to make TestClass non-value class (actual tested value classes are nested classes of TestClass)

I assume we don't have any test library code that will determine liveness of objects in the heap dump.

Could we possibly fix this with a forced GC before the heap dump?

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PR Review: https://git.openjdk.org/valhalla/pull/2109#pullrequestreview-3823195877