diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/native/build.gradle.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/native/build.gradle.mustache
index bbb221864eb..0613829b009 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/native/build.gradle.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/native/build.gradle.mustache
@@ -1,5 +1,6 @@
 apply plugin: 'idea'
 apply plugin: 'eclipse'
+apply plugin: 'com.diffplug.spotless'
 
 group = '{{groupId}}'
 version = '{{artifactVersion}}'
@@ -8,6 +9,9 @@ buildscript {
     repositories {
         mavenCentral()
     }
+    dependencies {
+        classpath 'com.diffplug.spotless:spotless-plugin-gradle:6.11.0'
+    }
 }
 
 repositories {
@@ -85,3 +89,26 @@ dependencies {
     implementation "org.apache.httpcomponents:httpmime:$httpmime_version"
     testImplementation "junit:junit:$junit_version"
 }
+
+// Use spotless plugin to automatically format code, remove unused import, etc
+// To apply changes directly to the file, run `gradlew spotlessApply`
+// Ref: https://github.com/diffplug/spotless/tree/main/plugin-gradle
+spotless {
+    // comment out below to run spotless as part of the `check` task
+    enforceCheck false
+    format 'misc', {
+        // define the files (e.g. '*.gradle', '*.md') to apply `misc` to
+        target '.gitignore'
+        // define the steps to apply to those files
+        trimTrailingWhitespace()
+        indentWithSpaces() // Takes an integer argument if you don't like 4
+        endWithNewline()
+    }
+    java {
+        // don't need to set target, it is inferred from java
+        // apply a specific flavor of google-java-format
+        googleJavaFormat('1.8').aosp().reflowLongStrings()
+        removeUnusedImports()
+        importOrder()
+    }
+}
diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/native/pom.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/native/pom.mustache
index 7eebfd48026..fc78cca4e02 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/native/pom.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/native/pom.mustache
@@ -134,6 +134,46 @@
                     </execution>
                 </executions>
             </plugin>
+            <!-- Use spotless plugin to automatically format code, remove unused import, etc
+                 To apply changes directly to the file, run `mvn spotless:apply`
+                 Ref: https://github.com/diffplug/spotless/tree/main/plugin-maven
+            -->
+            <plugin>
+              <groupId>com.diffplug.spotless</groupId>
+              <artifactId>spotless-maven-plugin</artifactId>
+              <version>${spotless.version}</version>
+              <configuration>
+                <formats>
+                  <!-- you can define as many formats as you want, each is independent -->
+                  <format>
+                    <!-- define the files to apply to -->
+                    <includes>
+                      <include>.gitignore</include>
+                    </includes>
+                    <!-- define the steps to apply to those files -->
+                    <trimTrailingWhitespace/>
+                    <endWithNewline/>
+                    <indent>
+                      <spaces>true</spaces> <!-- or <tabs>true</tabs> -->
+                      <spacesPerTab>4</spacesPerTab> <!-- optional, default is 4 -->
+                    </indent>
+                  </format>
+                </formats>
+                <!-- define a language-specific format -->
+                <java>
+                  <!-- no need to specify files, inferred automatically, but you can if you want -->
+
+                  <!-- apply a specific flavor of google-java-format and reflow long strings -->
+                  <googleJavaFormat>
+                    <version>1.8</version>
+                    <style>AOSP</style>
+                    <reflowLongStrings>true</reflowLongStrings>
+                  </googleJavaFormat>
+                  <removeUnusedImports/>
+                  <importOrder/>
+                </java>
+              </configuration>
+            </plugin>
         </plugins>
     </build>
 
@@ -240,5 +280,6 @@
         {{/useJakartaEe}}
         <httpmime-version>4.5.13</httpmime-version>
         <junit-version>4.13.2</junit-version>
+        <spotless.version>2.27.2</spotless.version>
     </properties>
 </project>
diff --git a/samples/client/echo_api/java/native/build.gradle b/samples/client/echo_api/java/native/build.gradle
index 479c7ef1ffb..4e526cc1e75 100644
--- a/samples/client/echo_api/java/native/build.gradle
+++ b/samples/client/echo_api/java/native/build.gradle
@@ -1,5 +1,6 @@
 apply plugin: 'idea'
 apply plugin: 'eclipse'
+apply plugin: 'com.diffplug.spotless'
 
 group = 'org.openapitools'
 version = '0.1.0'
@@ -8,6 +9,9 @@ buildscript {
     repositories {
         mavenCentral()
     }
+    dependencies {
+        classpath 'com.diffplug.spotless:spotless-plugin-gradle:6.11.0'
+    }
 }
 
 repositories {
@@ -79,3 +83,26 @@ dependencies {
     implementation "org.apache.httpcomponents:httpmime:$httpmime_version"
     testImplementation "junit:junit:$junit_version"
 }
+
+// Use spotless plugin to automatically format code, remove unused import, etc
+// To apply changes directly to the file, run `gradlew spotlessApply`
+// Ref: https://github.com/diffplug/spotless/tree/main/plugin-gradle
+spotless {
+    // comment out below to run spotless as part of the `check` task
+    enforceCheck false
+    format 'misc', {
+        // define the files (e.g. '*.gradle', '*.md') to apply `misc` to
+        target '.gitignore'
+        // define the steps to apply to those files
+        trimTrailingWhitespace()
+        indentWithSpaces() // Takes an integer argument if you don't like 4
+        endWithNewline()
+    }
+    java {
+        // don't need to set target, it is inferred from java
+        // apply a specific flavor of google-java-format
+        googleJavaFormat('1.8').aosp().reflowLongStrings()
+        removeUnusedImports()
+        importOrder()
+    }
+}
diff --git a/samples/client/echo_api/java/native/pom.xml b/samples/client/echo_api/java/native/pom.xml
index 8e8079eb53a..21f978f406f 100644
--- a/samples/client/echo_api/java/native/pom.xml
+++ b/samples/client/echo_api/java/native/pom.xml
@@ -127,6 +127,46 @@
                     </execution>
                 </executions>
             </plugin>
+            <!-- Use spotless plugin to automatically format code, remove unused import, etc
+                 To apply changes directly to the file, run `mvn spotless:apply`
+                 Ref: https://github.com/diffplug/spotless/tree/main/plugin-maven
+            -->
+            <plugin>
+              <groupId>com.diffplug.spotless</groupId>
+              <artifactId>spotless-maven-plugin</artifactId>
+              <version>${spotless.version}</version>
+              <configuration>
+                <formats>
+                  <!-- you can define as many formats as you want, each is independent -->
+                  <format>
+                    <!-- define the files to apply to -->
+                    <includes>
+                      <include>.gitignore</include>
+                    </includes>
+                    <!-- define the steps to apply to those files -->
+                    <trimTrailingWhitespace/>
+                    <endWithNewline/>
+                    <indent>
+                      <spaces>true</spaces> <!-- or <tabs>true</tabs> -->
+                      <spacesPerTab>4</spacesPerTab> <!-- optional, default is 4 -->
+                    </indent>
+                  </format>
+                </formats>
+                <!-- define a language-specific format -->
+                <java>
+                  <!-- no need to specify files, inferred automatically, but you can if you want -->
+
+                  <!-- apply a specific flavor of google-java-format and reflow long strings -->
+                  <googleJavaFormat>
+                    <version>1.8</version>
+                    <style>AOSP</style>
+                    <reflowLongStrings>true</reflowLongStrings>
+                  </googleJavaFormat>
+                  <removeUnusedImports/>
+                  <importOrder/>
+                </java>
+              </configuration>
+            </plugin>
         </plugins>
     </build>
 
@@ -218,5 +258,6 @@
         <jakarta-annotation-version>1.3.5</jakarta-annotation-version>
         <httpmime-version>4.5.13</httpmime-version>
         <junit-version>4.13.2</junit-version>
+        <spotless.version>2.27.2</spotless.version>
     </properties>
 </project>
diff --git a/samples/client/petstore/java/native-async/build.gradle b/samples/client/petstore/java/native-async/build.gradle
index 139a7ae2321..9a13583ffe1 100644
--- a/samples/client/petstore/java/native-async/build.gradle
+++ b/samples/client/petstore/java/native-async/build.gradle
@@ -1,5 +1,6 @@
 apply plugin: 'idea'
 apply plugin: 'eclipse'
+apply plugin: 'com.diffplug.spotless'
 
 group = 'org.openapitools'
 version = '1.0.0'
@@ -8,6 +9,9 @@ buildscript {
     repositories {
         mavenCentral()
     }
+    dependencies {
+        classpath 'com.diffplug.spotless:spotless-plugin-gradle:6.11.0'
+    }
 }
 
 repositories {
@@ -79,3 +83,26 @@ dependencies {
     implementation "org.apache.httpcomponents:httpmime:$httpmime_version"
     testImplementation "junit:junit:$junit_version"
 }
+
+// Use spotless plugin to automatically format code, remove unused import, etc
+// To apply changes directly to the file, run `gradlew spotlessApply`
+// Ref: https://github.com/diffplug/spotless/tree/main/plugin-gradle
+spotless {
+    // comment out below to run spotless as part of the `check` task
+    enforceCheck false
+    format 'misc', {
+        // define the files (e.g. '*.gradle', '*.md') to apply `misc` to
+        target '.gitignore'
+        // define the steps to apply to those files
+        trimTrailingWhitespace()
+        indentWithSpaces() // Takes an integer argument if you don't like 4
+        endWithNewline()
+    }
+    java {
+        // don't need to set target, it is inferred from java
+        // apply a specific flavor of google-java-format
+        googleJavaFormat('1.8').aosp().reflowLongStrings()
+        removeUnusedImports()
+        importOrder()
+    }
+}
diff --git a/samples/client/petstore/java/native-async/pom.xml b/samples/client/petstore/java/native-async/pom.xml
index 5166589d284..0c11192b050 100644
--- a/samples/client/petstore/java/native-async/pom.xml
+++ b/samples/client/petstore/java/native-async/pom.xml
@@ -127,6 +127,46 @@
                     </execution>
                 </executions>
             </plugin>
+            <!-- Use spotless plugin to automatically format code, remove unused import, etc
+                 To apply changes directly to the file, run `mvn spotless:apply`
+                 Ref: https://github.com/diffplug/spotless/tree/main/plugin-maven
+            -->
+            <plugin>
+              <groupId>com.diffplug.spotless</groupId>
+              <artifactId>spotless-maven-plugin</artifactId>
+              <version>${spotless.version}</version>
+              <configuration>
+                <formats>
+                  <!-- you can define as many formats as you want, each is independent -->
+                  <format>
+                    <!-- define the files to apply to -->
+                    <includes>
+                      <include>.gitignore</include>
+                    </includes>
+                    <!-- define the steps to apply to those files -->
+                    <trimTrailingWhitespace/>
+                    <endWithNewline/>
+                    <indent>
+                      <spaces>true</spaces> <!-- or <tabs>true</tabs> -->
+                      <spacesPerTab>4</spacesPerTab> <!-- optional, default is 4 -->
+                    </indent>
+                  </format>
+                </formats>
+                <!-- define a language-specific format -->
+                <java>
+                  <!-- no need to specify files, inferred automatically, but you can if you want -->
+
+                  <!-- apply a specific flavor of google-java-format and reflow long strings -->
+                  <googleJavaFormat>
+                    <version>1.8</version>
+                    <style>AOSP</style>
+                    <reflowLongStrings>true</reflowLongStrings>
+                  </googleJavaFormat>
+                  <removeUnusedImports/>
+                  <importOrder/>
+                </java>
+              </configuration>
+            </plugin>
         </plugins>
     </build>
 
@@ -218,5 +258,6 @@
         <jakarta-annotation-version>1.3.5</jakarta-annotation-version>
         <httpmime-version>4.5.13</httpmime-version>
         <junit-version>4.13.2</junit-version>
+        <spotless.version>2.27.2</spotless.version>
     </properties>
 </project>
diff --git a/samples/client/petstore/java/native-jakarta/build.gradle b/samples/client/petstore/java/native-jakarta/build.gradle
index 5c2571fb4a4..0c8090d61ed 100644
--- a/samples/client/petstore/java/native-jakarta/build.gradle
+++ b/samples/client/petstore/java/native-jakarta/build.gradle
@@ -1,5 +1,6 @@
 apply plugin: 'idea'
 apply plugin: 'eclipse'
+apply plugin: 'com.diffplug.spotless'
 
 group = 'org.openapitools'
 version = '1.0.0'
@@ -8,6 +9,9 @@ buildscript {
     repositories {
         mavenCentral()
     }
+    dependencies {
+        classpath 'com.diffplug.spotless:spotless-plugin-gradle:6.11.0'
+    }
 }
 
 repositories {
@@ -79,3 +83,26 @@ dependencies {
     implementation "org.apache.httpcomponents:httpmime:$httpmime_version"
     testImplementation "junit:junit:$junit_version"
 }
+
+// Use spotless plugin to automatically format code, remove unused import, etc
+// To apply changes directly to the file, run `gradlew spotlessApply`
+// Ref: https://github.com/diffplug/spotless/tree/main/plugin-gradle
+spotless {
+    // comment out below to run spotless as part of the `check` task
+    enforceCheck false
+    format 'misc', {
+        // define the files (e.g. '*.gradle', '*.md') to apply `misc` to
+        target '.gitignore'
+        // define the steps to apply to those files
+        trimTrailingWhitespace()
+        indentWithSpaces() // Takes an integer argument if you don't like 4
+        endWithNewline()
+    }
+    java {
+        // don't need to set target, it is inferred from java
+        // apply a specific flavor of google-java-format
+        googleJavaFormat('1.8').aosp().reflowLongStrings()
+        removeUnusedImports()
+        importOrder()
+    }
+}
diff --git a/samples/client/petstore/java/native-jakarta/pom.xml b/samples/client/petstore/java/native-jakarta/pom.xml
index 5b48ab268de..6bc82abbcc0 100644
--- a/samples/client/petstore/java/native-jakarta/pom.xml
+++ b/samples/client/petstore/java/native-jakarta/pom.xml
@@ -127,6 +127,46 @@
                     </execution>
                 </executions>
             </plugin>
+            <!-- Use spotless plugin to automatically format code, remove unused import, etc
+                 To apply changes directly to the file, run `mvn spotless:apply`
+                 Ref: https://github.com/diffplug/spotless/tree/main/plugin-maven
+            -->
+            <plugin>
+              <groupId>com.diffplug.spotless</groupId>
+              <artifactId>spotless-maven-plugin</artifactId>
+              <version>${spotless.version}</version>
+              <configuration>
+                <formats>
+                  <!-- you can define as many formats as you want, each is independent -->
+                  <format>
+                    <!-- define the files to apply to -->
+                    <includes>
+                      <include>.gitignore</include>
+                    </includes>
+                    <!-- define the steps to apply to those files -->
+                    <trimTrailingWhitespace/>
+                    <endWithNewline/>
+                    <indent>
+                      <spaces>true</spaces> <!-- or <tabs>true</tabs> -->
+                      <spacesPerTab>4</spacesPerTab> <!-- optional, default is 4 -->
+                    </indent>
+                  </format>
+                </formats>
+                <!-- define a language-specific format -->
+                <java>
+                  <!-- no need to specify files, inferred automatically, but you can if you want -->
+
+                  <!-- apply a specific flavor of google-java-format and reflow long strings -->
+                  <googleJavaFormat>
+                    <version>1.8</version>
+                    <style>AOSP</style>
+                    <reflowLongStrings>true</reflowLongStrings>
+                  </googleJavaFormat>
+                  <removeUnusedImports/>
+                  <importOrder/>
+                </java>
+              </configuration>
+            </plugin>
         </plugins>
     </build>
 
@@ -218,5 +258,6 @@
         <jakarta-annotation-version>2.1.1</jakarta-annotation-version>
         <httpmime-version>4.5.13</httpmime-version>
         <junit-version>4.13.2</junit-version>
+        <spotless.version>2.27.2</spotless.version>
     </properties>
 </project>
diff --git a/samples/client/petstore/java/native/build.gradle b/samples/client/petstore/java/native/build.gradle
index 139a7ae2321..9a13583ffe1 100644
--- a/samples/client/petstore/java/native/build.gradle
+++ b/samples/client/petstore/java/native/build.gradle
@@ -1,5 +1,6 @@
 apply plugin: 'idea'
 apply plugin: 'eclipse'
+apply plugin: 'com.diffplug.spotless'
 
 group = 'org.openapitools'
 version = '1.0.0'
@@ -8,6 +9,9 @@ buildscript {
     repositories {
         mavenCentral()
     }
+    dependencies {
+        classpath 'com.diffplug.spotless:spotless-plugin-gradle:6.11.0'
+    }
 }
 
 repositories {
@@ -79,3 +83,26 @@ dependencies {
     implementation "org.apache.httpcomponents:httpmime:$httpmime_version"
     testImplementation "junit:junit:$junit_version"
 }
+
+// Use spotless plugin to automatically format code, remove unused import, etc
+// To apply changes directly to the file, run `gradlew spotlessApply`
+// Ref: https://github.com/diffplug/spotless/tree/main/plugin-gradle
+spotless {
+    // comment out below to run spotless as part of the `check` task
+    enforceCheck false
+    format 'misc', {
+        // define the files (e.g. '*.gradle', '*.md') to apply `misc` to
+        target '.gitignore'
+        // define the steps to apply to those files
+        trimTrailingWhitespace()
+        indentWithSpaces() // Takes an integer argument if you don't like 4
+        endWithNewline()
+    }
+    java {
+        // don't need to set target, it is inferred from java
+        // apply a specific flavor of google-java-format
+        googleJavaFormat('1.8').aosp().reflowLongStrings()
+        removeUnusedImports()
+        importOrder()
+    }
+}
diff --git a/samples/client/petstore/java/native/pom.xml b/samples/client/petstore/java/native/pom.xml
index 5166589d284..0c11192b050 100644
--- a/samples/client/petstore/java/native/pom.xml
+++ b/samples/client/petstore/java/native/pom.xml
@@ -127,6 +127,46 @@
                     </execution>
                 </executions>
             </plugin>
+            <!-- Use spotless plugin to automatically format code, remove unused import, etc
+                 To apply changes directly to the file, run `mvn spotless:apply`
+                 Ref: https://github.com/diffplug/spotless/tree/main/plugin-maven
+            -->
+            <plugin>
+              <groupId>com.diffplug.spotless</groupId>
+              <artifactId>spotless-maven-plugin</artifactId>
+              <version>${spotless.version}</version>
+              <configuration>
+                <formats>
+                  <!-- you can define as many formats as you want, each is independent -->
+                  <format>
+                    <!-- define the files to apply to -->
+                    <includes>
+                      <include>.gitignore</include>
+                    </includes>
+                    <!-- define the steps to apply to those files -->
+                    <trimTrailingWhitespace/>
+                    <endWithNewline/>
+                    <indent>
+                      <spaces>true</spaces> <!-- or <tabs>true</tabs> -->
+                      <spacesPerTab>4</spacesPerTab> <!-- optional, default is 4 -->
+                    </indent>
+                  </format>
+                </formats>
+                <!-- define a language-specific format -->
+                <java>
+                  <!-- no need to specify files, inferred automatically, but you can if you want -->
+
+                  <!-- apply a specific flavor of google-java-format and reflow long strings -->
+                  <googleJavaFormat>
+                    <version>1.8</version>
+                    <style>AOSP</style>
+                    <reflowLongStrings>true</reflowLongStrings>
+                  </googleJavaFormat>
+                  <removeUnusedImports/>
+                  <importOrder/>
+                </java>
+              </configuration>
+            </plugin>
         </plugins>
     </build>
 
@@ -218,5 +258,6 @@
         <jakarta-annotation-version>1.3.5</jakarta-annotation-version>
         <httpmime-version>4.5.13</httpmime-version>
         <junit-version>4.13.2</junit-version>
+        <spotless.version>2.27.2</spotless.version>
     </properties>
 </project>