fix : check if metadata.annotations is null

Author: NeverRaR

extended/src/main/java/io/kubernetes/client/extended/kubectl/KubectlRollout.java

@@ -148,8 +148,7 @@ private void deploymentViewHistory(V1Deployment deployment, AppsV1Api api) throw
       List<Long> revisions = new ArrayList<>(historyInfo.keySet());
       revisions.sort(Long::compareTo);
       for (Long revision : revisions) {
-        String changeCause =
-            historyInfo.get(revision).getMetadata().getAnnotations().get(CHANGE_CAUSE_ANNOTATION);
+        String changeCause = getChangeCause(historyInfo.get(revision).getMetadata());
         if (changeCause == null || changeCause.isEmpty()) {
           changeCause = "<none>";
         }
@@ -214,8 +213,7 @@ private void parseHistory(List<V1ControllerRevision> historyList, PodTemplatePar
       List<Long> revisions = new ArrayList<>(historyInfo.keySet());
       revisions.sort(Long::compareTo);
       for (Long revision : revisions) {
-        String changeCause =
-            historyInfo.get(revision).getMetadata().getAnnotations().get(CHANGE_CAUSE_ANNOTATION);
+        String changeCause = getChangeCause(historyInfo.get(revision).getMetadata());
         if (changeCause == null || changeCause.isEmpty()) {
           changeCause = "<none>";
         }
@@ -250,6 +248,9 @@ private boolean isControlledBy(KubernetesObject obj, KubernetesObject owner) {
 
     // getChangeCause returns the change-cause annotation of the input object
     private String getChangeCause(V1ObjectMeta meta) {
+      if (meta.getAnnotations() == null) {
+        return null;
+      }
       return meta.getAnnotations().get(CHANGE_CAUSE_ANNOTATION);
     }
 

extended/src/main/java/io/kubernetes/client/extended/kubectl/util/deployment/DeploymentHelper.java

@@ -64,6 +64,7 @@ public static V1ReplicaSet getAllReplicaSets(
    * @return the revision number
    */
   public static Long revision(V1ObjectMeta meta) {
+    if (meta.getAnnotations() == null) return 0L;
     String v = meta.getAnnotations().get(REVISION_ANNOTATION);
     return v == null ? 0L : Long.parseLong(v);
   }