adutra commented on code in PR #8857:
URL: https://github.com/apache/iceberg/pull/8857#discussion_r1363697602


##########
nessie/src/main/java/org/apache/iceberg/nessie/NessieIcebergClient.java:
##########
@@ -181,23 +181,38 @@ public IcebergTable table(TableIdentifier 
tableIdentifier) {
   }
 
   public void createNamespace(Namespace namespace, Map<String, String> 
metadata) {
+    getRef().checkMutable();
+
+    if (namespace.isEmpty()) {
+      throw new IllegalArgumentException("Creating empty namespaces is not 
supported");
+    }
+
     try {
-      getRef().checkMutable();
-      withReference(
-              getApi()
-                  .createNamespace()
-                  
.namespace(org.projectnessie.model.Namespace.of(namespace.levels()))
-                  .properties(metadata))
-          .create();
+      org.projectnessie.model.Namespace content =
+          org.projectnessie.model.Namespace.of(metadata, namespace.levels());
+      ContentKey key = content.toContentKey();
+
+      api.commitMultipleOperations()

Review Comment:
   I cannot use `withReference` here, the commit operation is not an instance 
of `OnReferenceBuilder`.



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