Improved documentation for watching custom resources

[jmcrawford45]

I've been trying for a few hours to figure out what the expected workflow is for watching custom objects. Basically, I want to setup something in scala similar to https://www.baeldung.com/java-kubernetes-watch for custom objects. I followed https://github.com/kubernetes-client/java/wiki/5.-Generate-Java-CRD-Model for generating custom resource classes. I was able to get a resource version by applying a hack I saw in another github issue
val tsdList = { clients.head.listClusterCustomObjectCall( ... ) } val response = tsdList.execute() if (response.isSuccessful) { val body = response.body().string() gson .fromJson(body, classOf[CustomResourceList]).getMetadata.getResourceVersion } else null

But, when I try to watch the resource, I get a response with everything (status, type, object) set to null and no clear indicator of what's happening.

val call = clients.head.listClusterCustomObjectCall( ... resourceVersion, if (resourceVersion != null) "NotOlderThan" else null, ... ) val watch: Watch[Object] = Watch.createWatch( clients.head.getApiClient, call, new TypeToken[Response[Object]]() {}.getType)

Is there some other way that custom resources are expected to be handled?

[brendandburns]

I don't really know Scala, but I assume that Watch[Object] means Watch which returns Object. I think that you want to parameterize your Watch with the concrete type that you generated for your CRD.

The watch example is here:
https://github.com/kubernetes-client/java/blob/master/examples/examples-release-15/src/main/java/io/kubernetes/client/examples/WatchExample.java

It is for a built-in type, but I think it should work if you use your generated types.

If it doesn't let us know.

Note that we will need standard Java, not Scala code, since the authors of this project are not necessarily Scala experts.

[jmcrawford45]

I haven't been able to get the watch to work even when using the type of the implementor of KubernetesListObject. I'll try to repro in java or translate what I have currently and share tomorrow. Thanks for looking into this.

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/lifecycle rotten

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/close not-planned

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@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

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/close not-planned

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