RFR: 8377712: ConstantPool of WeakReferenceKey is not deterministic in CDS archive

Thu Feb 12 00:13:37 UTC 2026

On Wed, 11 Feb 2026 20:28:15 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> We are seeing intermittent failures (12 times in Jan 2026) where the CDS archives generated in the JDK build is not deterministic.
> 
> The symptom is that (perhaps due to the peculiarity of hash codes and memory addressing??) the constant pool entry for `ReferenceKey<?>` in the `WeakReferenceKey` class is not resolved when the failure happens.
> 
> The fix is for the JVM to call a method in `WeakReferenceKey` to force this entry to be resolved.

A better approach might be as simple as calling `MethodType.methodType(` to retrieve an existing method type, maybe `MethodType.methodType(void.class)` would be sufficient, in `MethodType::assemblySetup`.

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PR Comment: https://git.openjdk.org/jdk/pull/29678#issuecomment-3887917296