RejectedExecutionException when executing container tests

[haraldott]

Describe the bug

So I have a container testing suite with a k8s cluster containing a kafka + strimzi cluster and with the fabric8 kubernetes-client I'm creating/deleting some KafkaUsers/KafkaTopic resources. There are 18 tests and sometimes they run through correctly, but very often I'm getting the error that I've pasted down below. I'm not closing the client in between. It's happening completely arbitrarily, sometimes it happens, sometimes it doesn't. Any advice?

Fabric8 Kubernetes Client version

other (please specify in additional context)

Steps to reproduce

I'm using the KubernetesClientBuilder like this to obtain a client:

public KubernetesClient getKubernetesClient() { return new KubernetesClientBuilder().build(); }

Expected behavior

No crashes

Runtime

Kubernetes (vanilla)

Kubernetes API Server version

1.25.3@latest

Environment

macOS

Fabric8 Kubernetes Client Logs

java.util.concurrent.RejectedExecutionException: Task io.fabric8.kubernetes.client.utils.internal.SerialExecutor$$Lambda/0x000007fe018136a0@55e48584 rejected from java.util.concurrent.ThreadPoolExecutor@21fef032[Shutting down, pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 0]

	at java.base/java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2081)
	at java.base/java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:841)
	at java.base/java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1376)
	at io.fabric8.kubernetes.client.utils.internal.SerialExecutor.scheduleNext(SerialExecutor.java:75)
	at io.fabric8.kubernetes.client.utils.internal.SerialExecutor.lambda$execute$0(SerialExecutor.java:65)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at java.base/java.lang.Thread.run(Thread.java:1570)

Additional context

fabric8 kubernetes client version: 6.13.1