diff --git a/dev/copyright/java-header.txt b/dev/copyright/java-header.txt
new file mode 100644
index 000000000..bd244d07a
--- /dev/null
+++ b/dev/copyright/java-header.txt
@@ -0,0 +1,19 @@
+/*
+ * 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.
+ */
+
diff --git a/dev/copyright/scala-header.txt b/dev/copyright/scala-header.txt
new file mode 120000
index 000000000..372bb407f
--- /dev/null
+++ b/dev/copyright/scala-header.txt
@@ -0,0 +1 @@
+java-header.txt
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index 5a96eae83..d7cd0764e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -723,6 +723,9 @@ under the License.
               <importOrder>
                 <order>java|javax,scala,org,org.apache,com,org.apache.comet,\#,\#org.apache.comet</order>
               </importOrder>
+              <licenseHeader>
+                <file>${maven.multiModuleProjectDirectory}/dev/copyright/java-header.txt</file>
+              </licenseHeader>
             </java>
             <scala>
               <toggleOffOn />
@@ -730,6 +733,9 @@ under the License.
                 <version>3.6.1</version>
                 <file>${maven.multiModuleProjectDirectory}/scalafmt.conf</file>
               </scalafmt>
+              <licenseHeader>
+                <file>${maven.multiModuleProjectDirectory}/dev/copyright/scala-header.txt</file>
+              </licenseHeader>
             </scala>
           </configuration>
         </plugin>
diff --git a/spark/src/main/scala/org/apache/spark/sql/comet/CometPlan.scala b/spark/src/main/scala/org/apache/spark/sql/comet/CometPlan.scala
index fe2ce7ed0..e5d268cd9 100644
--- a/spark/src/main/scala/org/apache/spark/sql/comet/CometPlan.scala
+++ b/spark/src/main/scala/org/apache/spark/sql/comet/CometPlan.scala
@@ -1,18 +1,20 @@
 /*
- * 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
+ * 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
+ *   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.
+ * 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.
  */
 
 package org.apache.spark.sql.comet
diff --git a/spark/src/test/scala/org/apache/spark/sql/TPCH.scala b/spark/src/test/scala/org/apache/spark/sql/TPCH.scala
index 31e5cf798..721b01d64 100644
--- a/spark/src/test/scala/org/apache/spark/sql/TPCH.scala
+++ b/spark/src/test/scala/org/apache/spark/sql/TPCH.scala
@@ -17,6 +17,11 @@
  * under the License.
  */
 
+package org.apache.spark.sql
+
+import org.apache.spark.SparkContext
+import org.apache.spark.rdd.RDD
+
 /**
  * Mostly copied from
  * https://github.com/databricks/spark-sql-perf/blob/master/src/main/scala/com/databricks/spark/sql/perf/tpch/TPCH.scala
@@ -24,11 +29,6 @@
  * TODO: port this back to the upstream Spark similar to TPCDS benchmark
  */
 
-package org.apache.spark.sql
-
-import org.apache.spark.SparkContext
-import org.apache.spark.rdd.RDD
-
 class Dbgen(dbgenDir: String, params: Seq[String]) extends DataGenerator {
   val dbgen: String = s"$dbgenDir/dbgen"
 
diff --git a/spark/src/test/scala/org/apache/spark/sql/Tables.scala b/spark/src/test/scala/org/apache/spark/sql/Tables.scala
index 138238da8..99b9e149a 100644
--- a/spark/src/test/scala/org/apache/spark/sql/Tables.scala
+++ b/spark/src/test/scala/org/apache/spark/sql/Tables.scala
@@ -17,13 +17,6 @@
  * under the License.
  */
 
-/**
- * Mostly copied from
- * https://github.com/databricks/spark-sql-perf/blob/master/src/main/scala/com/databricks/spark/sql/perf/Tables.scala
- *
- * TODO: port this back to the upstream Spark similar to TPCDS benchmark
- */
-
 package org.apache.spark.sql
 
 import scala.util.Try
@@ -35,6 +28,12 @@ import org.apache.spark.rdd.RDD
 import org.apache.spark.sql.functions._
 import org.apache.spark.sql.types._
 
+/**
+ * Mostly copied from
+ * https://github.com/databricks/spark-sql-perf/blob/master/src/main/scala/com/databricks/spark/sql/perf/Tables.scala
+ *
+ * TODO: port this back to the upstream Spark similar to TPCDS benchmark
+ */
 trait DataGenerator extends Serializable {
   def generate(
       sparkContext: SparkContext,
diff --git a/spark/src/test/scala/org/apache/spark/sql/comet/CometPlanStabilitySuite.scala b/spark/src/test/scala/org/apache/spark/sql/comet/CometPlanStabilitySuite.scala
index ddd7d8d7e..48969ea41 100644
--- a/spark/src/test/scala/org/apache/spark/sql/comet/CometPlanStabilitySuite.scala
+++ b/spark/src/test/scala/org/apache/spark/sql/comet/CometPlanStabilitySuite.scala
@@ -16,6 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
+
 package org.apache.spark.sql.comet
 
 import java.io.File