The overload `MetaspaceObj::operator new(size_t, MemTag)` was added by JDK-8355003. It is declared nothrow. But it is implemented by calling `AllocateHeap` with the default failure type, e.g. `EXIT_OOM`. If it needs to return null on allocation failure then the failure mode for `AllocateHeap` needs to be changed to `RETURN_NULL`. If it doesn't need to return null, then the nothrow exception specification should be removed, to avoid unnecessary overhead from that specification.