Load class io.netty.buffer.ByteBufUtil in an environment with less than 2 CPU's.

Actual behavior

Fails with java.lang.IllegalArgumentException: capacity: 1 (expected: >= 2)

Steps to reproduce

In an environment with less than 2 CPU's run the below

Minimal yet complete reproducer code (or URL to code)

public static void main(String[] args) {
   io.netty.buffer.UnpooledByteBufAllocator.DEFAULT.directBuffer(16, 32);
}

Netty version

4.2.0.Beta1

JVM version (e.g. java -version)

openjdk version "21.0.3" 2024-04-16 LTS
OpenJDK Runtime Environment (build 21.0.3+10-LTS)
OpenJDK 64-Bit Server VM (build 21.0.3+10-LTS, mixed mode, sharing)

OS version (e.g. uname -a)

6.12.1-arch1-1 #1 SMP PREEMPT_DYNAMIC Fri, 22 Nov 2024 16:04:27 +0000 x86_64 GNU/Linux

Seems to be caused by io.netty.buffer.AdaptivePoolingAllocator.CENTRAL_QUEUE_CAPACITY being set equal to available CPU's.

Initially reported in vertx