diff --git a/java-codegen/build.gradle.kts b/java-codegen/build.gradle.kts
index 4179f5b3fa..c4e4daad66 100644
--- a/java-codegen/build.gradle.kts
+++ b/java-codegen/build.gradle.kts
@@ -251,6 +251,8 @@ spotless {
     java {
         target("**/*.java")
 
+        licenseHeaderFile("../LICENSE_HEADER.txt")
+
         // Use the default importOrder configuration
         importOrder()
         removeUnusedImports()
diff --git a/java-codegen/src/main/java/org/opensearch/client/codegen/model/Deprecation.java b/java-codegen/src/main/java/org/opensearch/client/codegen/model/Deprecation.java
index efe8c05826..9b1818a852 100644
--- a/java-codegen/src/main/java/org/opensearch/client/codegen/model/Deprecation.java
+++ b/java-codegen/src/main/java/org/opensearch/client/codegen/model/Deprecation.java
@@ -1,3 +1,11 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
 package org.opensearch.client.codegen.model;
 
 import java.util.Optional;
diff --git a/java-codegen/src/main/java/org/opensearch/client/codegen/model/OperationGroup.java b/java-codegen/src/main/java/org/opensearch/client/codegen/model/OperationGroup.java
index 0ccf012762..fa158e8e5f 100644
--- a/java-codegen/src/main/java/org/opensearch/client/codegen/model/OperationGroup.java
+++ b/java-codegen/src/main/java/org/opensearch/client/codegen/model/OperationGroup.java
@@ -1,3 +1,11 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
 package org.opensearch.client.codegen.model;
 
 import java.util.Collection;
diff --git a/java-codegen/src/main/java/org/opensearch/client/codegen/model/Types.java b/java-codegen/src/main/java/org/opensearch/client/codegen/model/Types.java
index 34e39f66bf..5451ae949f 100644
--- a/java-codegen/src/main/java/org/opensearch/client/codegen/model/Types.java
+++ b/java-codegen/src/main/java/org/opensearch/client/codegen/model/Types.java
@@ -1,3 +1,11 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
 package org.opensearch.client.codegen.model;
 
 import java.lang.reflect.Modifier;
diff --git a/java-codegen/src/main/java/org/opensearch/client/codegen/openapi/HttpMethod.java b/java-codegen/src/main/java/org/opensearch/client/codegen/openapi/HttpMethod.java
index 0659e5e725..8ef3dd8db8 100644
--- a/java-codegen/src/main/java/org/opensearch/client/codegen/openapi/HttpMethod.java
+++ b/java-codegen/src/main/java/org/opensearch/client/codegen/openapi/HttpMethod.java
@@ -1,3 +1,11 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
 package org.opensearch.client.codegen.openapi;
 
 import io.swagger.v3.oas.models.PathItem;
diff --git a/java-codegen/src/main/java/org/opensearch/client/codegen/openapi/OpenApiOperationBodyElement.java b/java-codegen/src/main/java/org/opensearch/client/codegen/openapi/OpenApiOperationBodyElement.java
index a118b6a572..3b5db201ca 100644
--- a/java-codegen/src/main/java/org/opensearch/client/codegen/openapi/OpenApiOperationBodyElement.java
+++ b/java-codegen/src/main/java/org/opensearch/client/codegen/openapi/OpenApiOperationBodyElement.java
@@ -1,3 +1,11 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
 package org.opensearch.client.codegen.openapi;
 
 import io.swagger.v3.oas.models.media.Content;