paulk-asert opened a new pull request, #2566:
URL: https://github.com/apache/groovy/pull/2566
Under newer JDKs, ObjectUtil.cloneObject fails for EnumSet because the
MethodHandles.Lookup, teleported into the concrete RegularEnumSet (a
package-private subclass in java.base), lacks the access needed to unreflect
the inherited public clone() method. The IllegalAccessException is swallowed by
DefaultGroovyMethodsSupport.cloneObject's catch-all and cloneSimilarCollection
falls back to LinkedHashSet, so
EnumSet.of(A, B, C) + D
now returns a LinkedHashSet instead of an EnumSet. Subsequent assignment to
an EnumSet-typed variable or field then fails with a GroovyCastException.
Fall back to plain reflective Method.invoke when the MethodHandle Lookup
cannot access clazz. The clone method itself is public, so reflective
invocation succeeds without needing --add-opens.
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