sun.misc.Unsafe::arrayBaseOffset has been called by com.linecorp.armeria.internal.shaded.jctools.maps.NonBlockingHashMap

[skharchikov]

Description

A warning is emitted at runtime related to the use of sun.misc.Unsafe when running the application with Armeria:

WARNING: sun.misc.Unsafe::arrayBaseOffset has been called by
com.linecorp.armeria.internal.shaded.jctools.maps.NonBlockingHashMap
(file:/app/libs/armeria-1.33.4.jar)

The warning suggests that the code is relying on internal JDK APIs that may be restricted or deprecated in newer Java versions.

See also:

• https://openjdk.org/jeps/471
• org.jctools.util.UnsafeAccess invokes terminally deprecated method sun.misc.Unsafe::objectFieldOffset JCTools/JCTools#395

[jrhee17]

Hey, thanks for the heads up. As it stands, CI is passing with 25 which means at the very least the most recent version didn't restrict usage of Unsafe APIs yet.

While our codebase has some direct usages of jctools, I guess as long as we're using Netty internally it's probably difficult for us to move away from using Unsafe completely unless they choose to do so.

Let me still keep this issue open so that we can be aware of this issue though.