diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/apiUtil.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/apiUtil.mustache
index 6608bdb2b97..cf72ff100b4 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/apiUtil.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/apiUtil.mustache
@@ -2,7 +2,10 @@ package {{apiPackage}};
 
 {{#reactive}}
 import java.nio.charset.StandardCharsets;
+import org.springframework.core.io.buffer.DefaultDataBuffer;
 import org.springframework.core.io.buffer.DefaultDataBufferFactory;
+import org.springframework.http.MediaType;
+import org.springframework.http.server.reactive.ServerHttpResponse;
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Mono;
 {{/reactive}}
@@ -27,8 +30,13 @@ public class ApiUtil {
     }
 {{/reactive}}
 {{#reactive}}
-    public static Mono<Void> getExampleResponse(ServerWebExchange exchange, String example) {
-        return exchange.getResponse().writeWith(Mono.just(new DefaultDataBufferFactory().wrap(example.getBytes(StandardCharsets.UTF_8))));
+    public static Mono<Void> getExampleResponse(ServerWebExchange exchange, MediaType mediaType, String example) {
+        ServerHttpResponse response = exchange.getResponse();
+        response.getHeaders().setContentType(mediaType);
+
+        byte[] exampleBytes = example.getBytes(StandardCharsets.UTF_8);
+        DefaultDataBuffer data = new DefaultDataBufferFactory().wrap(exampleBytes);
+        return response.writeWith(Mono.just(data));
     }
 {{/reactive}}
 }
diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/methodBody.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/methodBody.mustache
index e71414e99e1..b2f8edeb808 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/methodBody.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/methodBody.mustache
@@ -38,7 +38,7 @@ Mono<Void> result = Mono.empty();
         {{/-first}}
             if (mediaType.isCompatibleWith(MediaType.valueOf("{{{contentType}}}"))) {
                 String exampleString = {{>exampleString}};
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
         {{#-last}}
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/AnotherFakeApiDelegate.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/AnotherFakeApiDelegate.java
index 1cff47f7cfe..f925f8ac478 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/AnotherFakeApiDelegate.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/AnotherFakeApiDelegate.java
@@ -42,7 +42,7 @@ public interface AnotherFakeApiDelegate {
         for (MediaType mediaType : exchange.getRequest().getHeaders().getAccept()) {
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
                 String exampleString = "{ \"client\" : \"client\" }";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
         }
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/ApiUtil.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/ApiUtil.java
index f8d5d1d70b4..7ed3b0ab28d 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/ApiUtil.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/ApiUtil.java
@@ -1,12 +1,20 @@
 package org.openapitools.api;
 
 import java.nio.charset.StandardCharsets;
+import org.springframework.core.io.buffer.DefaultDataBuffer;
 import org.springframework.core.io.buffer.DefaultDataBufferFactory;
+import org.springframework.http.MediaType;
+import org.springframework.http.server.reactive.ServerHttpResponse;
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Mono;
 
 public class ApiUtil {
-    public static Mono<Void> getExampleResponse(ServerWebExchange exchange, String example) {
-        return exchange.getResponse().writeWith(Mono.just(new DefaultDataBufferFactory().wrap(example.getBytes(StandardCharsets.UTF_8))));
+    public static Mono<Void> getExampleResponse(ServerWebExchange exchange, MediaType mediaType, String example) {
+        ServerHttpResponse response = exchange.getResponse();
+        response.getHeaders().setContentType(mediaType);
+
+        byte[] exampleBytes = example.getBytes(StandardCharsets.UTF_8);
+        DefaultDataBuffer data = new DefaultDataBufferFactory().wrap(exampleBytes);
+        return response.writeWith(Mono.just(data));
     }
 }
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeApiDelegate.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeApiDelegate.java
index f79e5dc614f..348bc54bb04 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeApiDelegate.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeApiDelegate.java
@@ -83,7 +83,7 @@ public interface FakeApiDelegate {
         for (MediaType mediaType : exchange.getRequest().getHeaders().getAccept()) {
             if (mediaType.isCompatibleWith(MediaType.valueOf("*/*"))) {
                 String exampleString = "{ \"my_string\" : \"my_string\", \"my_number\" : 0.8008281904610115, \"my_boolean\" : true }";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
         }
@@ -171,7 +171,7 @@ public interface FakeApiDelegate {
         for (MediaType mediaType : exchange.getRequest().getHeaders().getAccept()) {
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
                 String exampleString = "{ \"client\" : \"client\" }";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
         }
@@ -353,7 +353,7 @@ public interface FakeApiDelegate {
         for (MediaType mediaType : exchange.getRequest().getHeaders().getAccept()) {
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
                 String exampleString = "{ \"code\" : 0, \"type\" : \"type\", \"message\" : \"message\" }";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
         }
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeClassnameTestApiDelegate.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeClassnameTestApiDelegate.java
index de22e925256..621c2335818 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeClassnameTestApiDelegate.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeClassnameTestApiDelegate.java
@@ -42,7 +42,7 @@ public interface FakeClassnameTestApiDelegate {
         for (MediaType mediaType : exchange.getRequest().getHeaders().getAccept()) {
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
                 String exampleString = "{ \"client\" : \"client\" }";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
         }
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/PetApiDelegate.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/PetApiDelegate.java
index b6abecd34cb..12eca420903 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/PetApiDelegate.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/PetApiDelegate.java
@@ -79,12 +79,12 @@ public interface PetApiDelegate {
         for (MediaType mediaType : exchange.getRequest().getHeaders().getAccept()) {
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
                 String exampleString = "{ \"photoUrls\" : [ \"photoUrls\", \"photoUrls\" ], \"name\" : \"doggie\", \"id\" : 0, \"category\" : { \"name\" : \"default-name\", \"id\" : 6 }, \"tags\" : [ { \"name\" : \"name\", \"id\" : 1 }, { \"name\" : \"name\", \"id\" : 1 } ], \"status\" : \"available\" }";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/xml"))) {
                 String exampleString = "<Pet> <id>123456789</id> <name>doggie</name> <photoUrls> <photoUrls>aeiou</photoUrls> </photoUrls> <tags> </tags> <status>aeiou</status> </Pet>";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
         }
@@ -109,12 +109,12 @@ public interface PetApiDelegate {
         for (MediaType mediaType : exchange.getRequest().getHeaders().getAccept()) {
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
                 String exampleString = "{ \"photoUrls\" : [ \"photoUrls\", \"photoUrls\" ], \"name\" : \"doggie\", \"id\" : 0, \"category\" : { \"name\" : \"default-name\", \"id\" : 6 }, \"tags\" : [ { \"name\" : \"name\", \"id\" : 1 }, { \"name\" : \"name\", \"id\" : 1 } ], \"status\" : \"available\" }";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/xml"))) {
                 String exampleString = "<Pet> <id>123456789</id> <name>doggie</name> <photoUrls> <photoUrls>aeiou</photoUrls> </photoUrls> <tags> </tags> <status>aeiou</status> </Pet>";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
         }
@@ -139,12 +139,12 @@ public interface PetApiDelegate {
         for (MediaType mediaType : exchange.getRequest().getHeaders().getAccept()) {
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
                 String exampleString = "{ \"photoUrls\" : [ \"photoUrls\", \"photoUrls\" ], \"name\" : \"doggie\", \"id\" : 0, \"category\" : { \"name\" : \"default-name\", \"id\" : 6 }, \"tags\" : [ { \"name\" : \"name\", \"id\" : 1 }, { \"name\" : \"name\", \"id\" : 1 } ], \"status\" : \"available\" }";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/xml"))) {
                 String exampleString = "<Pet> <id>123456789</id> <name>doggie</name> <photoUrls> <photoUrls>aeiou</photoUrls> </photoUrls> <tags> </tags> <status>aeiou</status> </Pet>";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
         }
@@ -207,7 +207,7 @@ public interface PetApiDelegate {
         for (MediaType mediaType : exchange.getRequest().getHeaders().getAccept()) {
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
                 String exampleString = "{ \"code\" : 0, \"type\" : \"type\", \"message\" : \"message\" }";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
         }
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/StoreApiDelegate.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/StoreApiDelegate.java
index cf7b723ae56..680de023d02 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/StoreApiDelegate.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/StoreApiDelegate.java
@@ -76,12 +76,12 @@ public interface StoreApiDelegate {
         for (MediaType mediaType : exchange.getRequest().getHeaders().getAccept()) {
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
                 String exampleString = "{ \"petId\" : 6, \"quantity\" : 1, \"id\" : 0, \"shipDate\" : \"2000-01-23T04:56:07.000+00:00\", \"complete\" : false, \"status\" : \"placed\" }";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/xml"))) {
                 String exampleString = "<Order> <id>123456789</id> <petId>123456789</petId> <quantity>123</quantity> <shipDate>2000-01-23T04:56:07.000Z</shipDate> <status>aeiou</status> <complete>true</complete> </Order>";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
         }
@@ -104,12 +104,12 @@ public interface StoreApiDelegate {
         for (MediaType mediaType : exchange.getRequest().getHeaders().getAccept()) {
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
                 String exampleString = "{ \"petId\" : 6, \"quantity\" : 1, \"id\" : 0, \"shipDate\" : \"2000-01-23T04:56:07.000+00:00\", \"complete\" : false, \"status\" : \"placed\" }";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/xml"))) {
                 String exampleString = "<Order> <id>123456789</id> <petId>123456789</petId> <quantity>123</quantity> <shipDate>2000-01-23T04:56:07.000Z</shipDate> <status>aeiou</status> <complete>true</complete> </Order>";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
         }
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/UserApiDelegate.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/UserApiDelegate.java
index b40ebabc5cd..7241a736ea1 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/UserApiDelegate.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/UserApiDelegate.java
@@ -107,12 +107,12 @@ public interface UserApiDelegate {
         for (MediaType mediaType : exchange.getRequest().getHeaders().getAccept()) {
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {
                 String exampleString = "{ \"firstName\" : \"firstName\", \"lastName\" : \"lastName\", \"password\" : \"password\", \"userStatus\" : 6, \"phone\" : \"phone\", \"id\" : 0, \"email\" : \"email\", \"username\" : \"username\" }";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
             if (mediaType.isCompatibleWith(MediaType.valueOf("application/xml"))) {
                 String exampleString = "<User> <id>123456789</id> <username>aeiou</username> <firstName>aeiou</firstName> <lastName>aeiou</lastName> <email>aeiou</email> <password>aeiou</password> <phone>aeiou</phone> <userStatus>123</userStatus> </User>";
-                result = ApiUtil.getExampleResponse(exchange, exampleString);
+                result = ApiUtil.getExampleResponse(exchange, mediaType, exampleString);
                 break;
             }
         }