NoClassDefFoundError io/fabric8/kubernetes/client/dsl/ServerSideApplicable

[prakashreddy-97]

Describe the bug

Hello Team,

I am trying to use the @EnableKubernetesMockClient annotation to create a kubernetesClient in my test class which are in juupiter junit, but I am getting the following error.

NoClassDefFoundError io/fabric8/kubernetes/client/dsl/ServerSideApplicable

Fabric8 Kubernetes Client version

6.3.1

Steps to reproduce

import io.fabric8.kubernetes.client.KubernetesClient;
import io.fabric8.kubernetes.client.server.mock.EnableKubernetesMockClient;
import org.junit.jupiter.api.Test;

@EnableKubernetesMockClient
class MyTest {

KubernetesClient client;

##Code
}

Expected behavior

Would like to get a mocked value for kubernetsClient

Runtime

Kubernetes (vanilla)

Kubernetes API Server version

1.25.3@latest

Environment

Windows

Fabric8 Kubernetes Client Logs

No response

Additional context

No response

[manusa]

You seem to be using an older version of the client (6.3.1).
I also suspect that your project might also be using a third-party library or framework such as Spring, Quarkus, etc. that might also bring a newer (or older version of the client).
Could you please confirm this?

[prakashreddy-97]

Hey @manusa, Yes we are using the springboot framework(3.0.19), java version 17. We were using groovy for unit tests before upgrading to these versions and couldn't mock the kubernetes-client. Thats when we started using the jupiter-junit and still could not mock the kubernetes-client.

[manusa]

Are you using Spring Cloud Kubernetes too?
Check if the Fabric8 Kubernetes Client is being imported transitively from one of those libraries. It's likely that you have a version convergence issue.

[prakashreddy-97]

We are not using Spring Cloud Kubernetes, and there are no other dependencies that import kubernetes-client

[manusa]

Try to create a reproducer project then.
The code you showed should be working with a standard Kubernetes Client project setup.

[prakashreddy-97]

Ok, will try that and get back to you. Thank you