JsonSyntaxException related to status.conditions[0].lastTransitionTime

[dzhi-lyft]

Hit following error to parse getNamespacedCustomObject() result into KruiseAppsV1alpha1CloneSet (gson 2.8.9).

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at path $.status.conditions[0].lastTransitionTime

unfortunately I don't have the status.conditions[0].lastTransitionTime field as it does not normally exists in the cloneset object and we didn't save a copy when it happened (I will add an example if this happens again in the future). I wonder whether there is a possible mismatch between the expected and real format of the field. Or like to know if there is a better way to obtain KruiseAppsV1alpha1CloneSet from the returned obj.

    ApiClient client = Config.defaultClient();
    Configuration.setDefaultApiClient(client);
    CustomObjectsApi customObjectsApi = new CustomObjectsApi(client);
    Object obj = customObjectsApi.getNamespacedCustomObject(
        "apps.kruise.io",                 // group
        "v1alpha1",                       // version
        K8sCommon.getNamespaceFromEnv(),  // namespace
        "clonesets",                      // plural
        cloneset                          // name
    );

    Gson gson = new JSON().getGson();
    KruiseAppsV1alpha1CloneSet v1cs = gson.fromJson(
        gson.toJsonTree(obj).getAsJsonObject(), KruiseAppsV1alpha1CloneSet.class);

[FillZpp]

@dzhi-lyft I wrote a test according your code and tried to get a cloneset in my test cluster. There is no error or exception.

The status of cloneset looks like this:

status:
  availableReplicas: 3
  collisionCount: 0
  currentRevision: demo-clone-d9cb8496d
  labelSelector: app=guestbook
  observedGeneration: 1
  readyReplicas: 3
  replicas: 3
  updateRevision: demo-clone-d9cb8496d
  updatedReadyReplicas: 3
  updatedReplicas: 3

I'm not sure what's the difference between yours?

[dzhi-lyft]

@FillZpp I caught and logged one example below. I am not sure under what condition k8s include the "conditions" field and whether different versions of k8s returns different format. The "conditions" field only appears sometime in which case the parse will fail.

  "status": {
    "availableReplicas": 199.0,
    "collisionCount": 0.0,
    "conditions": [
      {
        "lastTransitionTime": "2022-01-04T18:09:54Z",
        "message": "The POST operation against Pod could not be completed at this time, please try again.",
        "status": "True",
        "type": "FailedScale"
      }
    ],
    "labelSelector": "app=nodemanager-894d7",
    "observedGeneration": 2329.0,
    "readyReplicas": 199.0,
    "replicas": 199.0,
    "updateRevision": "nodemanager-894d7-6b7579fb78",
    "updatedReadyReplicas": 199.0,
    "updatedReplicas": 199.0
  }