diff --git a/examples/cluster-java21.yaml b/examples/cluster-java21.yaml
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+++ b/examples/cluster-java21.yaml
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+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+apiVersion: spark.apache.org/v1alpha1
+kind: SparkCluster
+metadata:
+  name: cluster-java21
+spec:
+  runtimeVersions:
+    sparkVersion: "4.0.0-preview1"
+  clusterTolerations:
+    instanceConfig:
+      initWorkers: 3
+      minWorkers: 3
+      maxWorkers: 3
+  sparkConf:
+    spark.kubernetes.container.image: "apache/spark:4.0.0-preview1-java21"
+    spark.master.ui.title: "Prod Spark Cluster (Java 21)"
+    spark.master.rest.enabled: "true"
+    spark.master.rest.host: "0.0.0.0"
+    spark.ui.reverseProxy: "true"