Kubernetes-client: Always getting class sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl cannot be cast to class java.lang.Class

[jarorosFork]

Always getting this exception with such code

Binding binding = new BindingBuilder()
                    .withNewMetadata().withName(pod.getMetadata().getName()).endMetadata()
                    .withNewTarget().withKind("Node").withApiVersion("v1").withName(node.getMetadata().getName()).endTarget()
                    .build();

kubernetesClient.bindings().inNamespace(pod.getMetadata().getNamespace()).create(binding);

java.lang.ClassCastException: class sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl cannot be cast to class java.lang.Class (sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl and java.lang.Class are in module java.base of loader 'bootstrap')
    at io.fabric8.kubernetes.client.dsl.internal.core.v1.BindingOperationsImpl.<init>(BindingOperationsImpl.java:42) ~[kubernetes-client-4.10.3.jar:na]
    at io.fabric8.kubernetes.client.dsl.internal.core.v1.BindingOperationsImpl.<init>(BindingOperationsImpl.java:34) ~[kubernetes-client-4.10.3.jar:na]
    at io.fabric8.kubernetes.client.dsl.internal.core.v1.BindingOperationsImpl.<init>(BindingOperationsImpl.java:30) ~[kubernetes-client-4.10.3.jar:na]
    at io.fabric8.kubernetes.client.DefaultKubernetesClient.bindings(DefaultKubernetesClient.java:198) ~[kubernetes-client-4.10.3.jar:na]

[rohanKanojia]

Thanks a lot for reporting this! This error seems to be coming from this line:
https://github.com/fabric8io/kubernetes-client/blob/8e3f4be591e725384a422186da71764853f49389/kubernetes-client/src/main/java/io/fabric8/kubernetes/client/dsl/internal/core/v1/BindingOperationsImpl.java#L43

When I added support for Binding in https://github.com/fabric8io/kubernetes-client/pull/1819 . It looked like this:

  public BindingOperationsImpl(OperationContext context) {
    super(context
      .withApiGroupVersion("v1")
      .withPlural("bindings"));
    this.type = Binding.class;
    this.listType = KubernetesResourceList.class;
    this.doneableType = DoneableBinding.class;
  }

I'm not 100% sure since I haven't tried it myself but reverting to the old state should fix this issue.

[jarorosFork]

Version 4.9.2 works for me, any newer version start failing with such exception.
Do you have any work around for this exception ? Because i also want to use undo() which is absent in this version

[rohanKanojia]

@jarorosFork: Unfortunately, I can't think of any workaround for this since it's the Operation class initialization that's failing :-( . I tried using generic resource API but since Binding hasn't get any dedicated List type, it fails this error:

// Fails with 'No handler found for object:Binding'
kubernetesClient.resource(binding).inNamespace("default").createOrReplace();

Would it be possible for you to submit a PR to fix this if you have some time?

what's undo()? Is this some new operation supported by Binding? I would suggest creating another issue for this new feature.

[jarorosFork]

undo is
kubernetesClient.apps().deployments() .inNamespace(deployment.getMetadata().getNamespace()) .withName(deployment.getMetadata().getName()) .rolling().undo();
No starting from 4.10.0 client has undo method but starting from 4.10 i'm getting this exception
Thanks, will submit PR

[manusa]

Hi, I'm creating a fix + adding a unit test + IT which will prevent this from happening again.

[manusa]

Relates to:

• #1816
• #1819
• #2278