Unable to unmarshal sts

[ghost]

I'm trying build a StatefulSet from a yaml (code stolen from https://github.com/java-operator-sdk/java-operator-sdk/blob/main/sample-operators/webpage/src/main/java/io/javaoperatorsdk/operator/sample/WebPageOperator.java). When I feed my yaml to unmarshal, I get this unhelpful exception:

io.fabric8.kubernetes.client.KubernetesClientException: An error has occurred.
	at io.fabric8.kubernetes.client.KubernetesClientException.launderThrowable(KubernetesClientException.java:103) ~[kubernetes-client-5.11.2.jar:na]
	at io.fabric8.kubernetes.client.KubernetesClientException.launderThrowable(KubernetesClientException.java:97) ~[kubernetes-client-5.11.2.jar:na]
	at io.fabric8.kubernetes.client.utils.Serialization.unmarshal(Serialization.java:315) ~[kubernetes-client-5.11.2.jar:na]
	at io.fabric8.kubernetes.client.utils.Serialization.unmarshal(Serialization.java:267) ~[kubernetes-client-5.11.2.jar:na]
	at io.fabric8.kubernetes.client.utils.Serialization.unmarshal(Serialization.java:255) ~[kubernetes-client-5.11.2.jar:na]
...
Caused by: java.io.IOException: Stream closed
	at java.base/java.io.BufferedInputStream.getInIfOpen(BufferedInputStream.java:165) ~[na:na]
	at java.base/java.io.BufferedInputStream.fill(BufferedInputStream.java:252) ~[na:na]
	at java.base/java.io.BufferedInputStream.read(BufferedInputStream.java:271) ~[na:na]
	at io.fabric8.kubernetes.client.utils.Serialization.unmarshal(Serialization.java:305) ~[kubernetes-client-5.11.2.jar:na]
	... 18 common frames omitted

I can kubectl apply -f my yaml file without issue, so I'm stumped what I'm doing wrong here.

[ghost]

It helps if you read the code carefully. I was missing the leading "/" on the resource name, and the resource was not found. Nonetheless, the error reporting is very unhelpful.