diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/api.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/api.mustache
index a5457e2a9c10..0f42c448ee60 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/api.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/api.mustache
@@ -38,6 +38,7 @@ import org.springframework.web.multipart.MultipartFile;
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import org.springframework.http.codec.multipart.Part;
 {{/reactive}}
 
 {{#useBeanValidation}}
@@ -135,7 +136,7 @@ public interface {{classname}} {
     }
 
     // Override this method
-    {{#jdk8-default-interface}}default {{/jdk8-default-interface}} {{#responseWrapper}}{{.}}<{{/responseWrapper}}ResponseEntity<{{>returnTypes}}>{{#responseWrapper}}>{{/responseWrapper}} {{operationId}}({{#allParams}}{{^isFile}}{{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{#isBodyParam}}{{^reactive}}{{{dataType}}}{{/reactive}}{{#reactive}}{{^isListContainer}}Mono{{/isListContainer}}{{#isListContainer}}Flux{{/isListContainer}}<{{{baseType}}}>{{/reactive}}{{/isBodyParam}}{{/isFile}}{{#isFile}}MultipartFile{{/isFile}} {{paramName}}{{#hasMore}}, {{/hasMore}}{{/allParams}}{{#reactive}}{{#hasParams}}, {{/hasParams}}ServerWebExchange exchange{{/reactive}}){{#unhandledException}} throws Exception{{/unhandledException}} {
+    {{#jdk8-default-interface}}default {{/jdk8-default-interface}} {{#responseWrapper}}{{.}}<{{/responseWrapper}}ResponseEntity<{{>returnTypes}}>{{#responseWrapper}}>{{/responseWrapper}} {{operationId}}({{#allParams}}{{^isFile}}{{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{#isBodyParam}}{{^reactive}}{{{dataType}}}{{/reactive}}{{#reactive}}{{^isListContainer}}Mono{{/isListContainer}}{{#isListContainer}}Flux{{/isListContainer}}<{{{baseType}}}>{{/reactive}}{{/isBodyParam}}{{/isFile}}{{#isFile}}{{#reactive}}Flux<Part>{{/reactive}}{{^reactive}}MultipartFile{{/reactive}}{{/isFile}} {{paramName}}{{#hasMore}}, {{/hasMore}}{{/allParams}}{{#reactive}}{{#hasParams}}, {{/hasParams}}ServerWebExchange exchange{{/reactive}}){{#unhandledException}} throws Exception{{/unhandledException}} {
         {{/delegate-method}}
         {{^isDelegate}}
         {{>methodBody}}
diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/apiDelegate.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/apiDelegate.mustache
index e93ba0a69d33..993750af6279 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/apiDelegate.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/apiDelegate.mustache
@@ -16,6 +16,7 @@ import org.springframework.web.multipart.MultipartFile;
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import org.springframework.http.codec.multipart.Part;
 {{/reactive}}
 
 import java.util.List;
@@ -67,7 +68,7 @@ public interface {{classname}}Delegate {
     {{/externalDocs}}
      * @see {{classname}}#{{operationId}}
      */
-    {{#jdk8-default-interface}}default {{/jdk8-default-interface}}{{#responseWrapper}}{{.}}<{{/responseWrapper}}ResponseEntity<{{>returnTypes}}>{{#responseWrapper}}>{{/responseWrapper}} {{operationId}}({{#allParams}}{{^isFile}}{{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{#isBodyParam}}{{^reactive}}{{{dataType}}}{{/reactive}}{{#reactive}}{{^isListContainer}}Mono{{/isListContainer}}{{#isListContainer}}Flux{{/isListContainer}}<{{{baseType}}}>{{/reactive}}{{/isBodyParam}}{{/isFile}}{{#isFile}}{{#isListContainer}}List<{{/isListContainer}}MultipartFile{{#isListContainer}}>{{/isListContainer}}{{/isFile}} {{paramName}}{{#hasMore}},
+    {{#jdk8-default-interface}}default {{/jdk8-default-interface}}{{#responseWrapper}}{{.}}<{{/responseWrapper}}ResponseEntity<{{>returnTypes}}>{{#responseWrapper}}>{{/responseWrapper}} {{operationId}}({{#allParams}}{{^isFile}}{{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{#isBodyParam}}{{^reactive}}{{{dataType}}}{{/reactive}}{{#reactive}}{{^isListContainer}}Mono{{/isListContainer}}{{#isListContainer}}Flux{{/isListContainer}}<{{{baseType}}}>{{/reactive}}{{/isBodyParam}}{{/isFile}}{{#isFile}}{{#isListContainer}}List<{{/isListContainer}}{{#reactive}}Flux<Part>{{/reactive}}{{^reactive}}MultipartFile{{/reactive}}{{#isListContainer}}>{{/isListContainer}}{{/isFile}} {{paramName}}{{#hasMore}},
         {{/hasMore}}{{/allParams}}{{#reactive}}{{#hasParams}},
         {{/hasParams}}ServerWebExchange exchange{{/reactive}}){{#unhandledException}} throws Exception{{/unhandledException}}{{^jdk8-default-interface}};{{/jdk8-default-interface}}{{#jdk8-default-interface}} {
         {{>methodBody}}
diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/formParams.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/formParams.mustache
index cb794f9f381f..a97688aa95ca 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/formParams.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/formParams.mustache
@@ -1 +1 @@
-{{#isFormParam}}{{^isFile}}@ApiParam(value = "{{{description}}}"{{#required}}, required=true{{/required}}{{#allowableValues}}, allowableValues="{{#values}}{{{.}}}{{^-last}}, {{/-last}}{{#-last}}{{/-last}}{{/values}}"{{/allowableValues}}{{^isContainer}}{{#defaultValue}}, defaultValue={{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{/defaultValue}}{{/isContainer}}) {{#useBeanValidation}}@Valid{{/useBeanValidation}} @RequestPart(value = "{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}})  {{{dataType}}} {{paramName}}{{/isFile}}{{#isFile}}@ApiParam(value = "{{{description}}}") {{#useBeanValidation}}@Valid{{/useBeanValidation}} @RequestPart(value = "{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}) {{#isListContainer}}List<{{/isListContainer}}MultipartFile{{#isListContainer}}>{{/isListContainer}} {{baseName}}{{/isFile}}{{/isFormParam}}
\ No newline at end of file
+{{#isFormParam}}{{^isFile}}@ApiParam(value = "{{{description}}}"{{#required}}, required=true{{/required}}{{#allowableValues}}, allowableValues="{{#values}}{{{.}}}{{^-last}}, {{/-last}}{{#-last}}{{/-last}}{{/values}}"{{/allowableValues}}{{^isContainer}}{{#defaultValue}}, defaultValue={{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{/defaultValue}}{{/isContainer}}) {{#useBeanValidation}}@Valid{{/useBeanValidation}} @RequestPart(value = "{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}})  {{{dataType}}} {{paramName}}{{/isFile}}{{#isFile}}@ApiParam(value = "{{{description}}}") {{#useBeanValidation}}@Valid{{/useBeanValidation}} @RequestPart(value = "{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}) {{#isListContainer}}List<{{/isListContainer}}{{#reactive}}Flux<Part>{{/reactive}}{{^reactive}}MultipartFile{{/reactive}}{{#isListContainer}}>{{/isListContainer}} {{baseName}}{{/isFile}}{{/isFormParam}}
\ No newline at end of file
diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-cloud/formParams.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-cloud/formParams.mustache
index 13a6e56e14b5..cd13f6320854 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-cloud/formParams.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-cloud/formParams.mustache
@@ -1 +1 @@
-{{#isFormParam}}{{^isFile}}@ApiParam(value = "{{{description}}}"{{#required}}, required=true{{/required}} {{#allowableValues}}, allowableValues="{{{allowableValues}}}"{{/allowableValues}}{{^isContainer}}{{#defaultValue}}, defaultValue={{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{/defaultValue}}{{/isContainer}}) @RequestParam(value="{{baseName}}"{{#required}}, required=true{{/required}}{{^required}}, required=false{{/required}})  {{{dataType}}} {{paramName}}{{/isFile}}{{#isFile}}@ApiParam(value = "{{{description}}}") @RequestParam("{{baseName}}") {{#isListContainer}}List<{{/isListContainer}}MultipartFile{{#isListContainer}}>{{/isListContainer}} {{paramName}}{{/isFile}}{{/isFormParam}}
\ No newline at end of file
+{{#isFormParam}}{{^isFile}}@ApiParam(value = "{{{description}}}"{{#required}}, required=true{{/required}} {{#allowableValues}}, allowableValues="{{{allowableValues}}}"{{/allowableValues}}{{^isContainer}}{{#defaultValue}}, defaultValue={{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{/defaultValue}}{{/isContainer}}) @RequestParam(value="{{baseName}}"{{#required}}, required=true{{/required}}{{^required}}, required=false{{/required}})  {{{dataType}}} {{paramName}}{{/isFile}}{{#isFile}}@ApiParam(value = "{{{description}}}") @RequestParam("{{baseName}}") {{#isListContainer}}List<{{/isListContainer}}{{#reactive}}Flux<Part>{{/reactive}}{{^reactive}}MultipartFile{{/reactive}}{{#isListContainer}}>{{/isListContainer}} {{paramName}}{{/isFile}}{{/isFormParam}}
\ No newline at end of file
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/AnotherFakeApi.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/AnotherFakeApi.java
index a7c9567e168d..bd4902862f59 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/AnotherFakeApi.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/AnotherFakeApi.java
@@ -21,6 +21,7 @@
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import org.springframework.http.codec.multipart.Part;
 
 import javax.validation.Valid;
 import javax.validation.constraints.*;
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 bc51a545ff54..1cff47f7cfea 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
@@ -10,6 +10,7 @@
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import org.springframework.http.codec.multipart.Part;
 
 import java.util.List;
 import java.util.Map;
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeApi.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeApi.java
index 203c4720538e..2b5c3369e1c8 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeApi.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeApi.java
@@ -31,6 +31,7 @@
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import org.springframework.http.codec.multipart.Part;
 
 import javax.validation.Valid;
 import javax.validation.constraints.*;
@@ -220,7 +221,7 @@ default Mono<ResponseEntity<Client>> testClientModel(@ApiParam(value = "client m
     @RequestMapping(value = "/fake",
         consumes = { "application/x-www-form-urlencoded" },
         method = RequestMethod.POST)
-    default Mono<ResponseEntity<Void>> testEndpointParameters(@ApiParam(value = "None", required=true) @Valid @RequestPart(value = "number", required = true)  BigDecimal number,@ApiParam(value = "None", required=true) @Valid @RequestPart(value = "double", required = true)  Double _double,@ApiParam(value = "None", required=true) @Valid @RequestPart(value = "pattern_without_delimiter", required = true)  String patternWithoutDelimiter,@ApiParam(value = "None", required=true) @Valid @RequestPart(value = "byte", required = true)  byte[] _byte,@ApiParam(value = "None") @Valid @RequestPart(value = "integer", required = false)  Integer integer,@ApiParam(value = "None") @Valid @RequestPart(value = "int32", required = false)  Integer int32,@ApiParam(value = "None") @Valid @RequestPart(value = "int64", required = false)  Long int64,@ApiParam(value = "None") @Valid @RequestPart(value = "float", required = false)  Float _float,@ApiParam(value = "None") @Valid @RequestPart(value = "string", required = false)  String string,@ApiParam(value = "None") @Valid @RequestPart(value = "binary", required = false) MultipartFile binary,@ApiParam(value = "None") @Valid @RequestPart(value = "date", required = false)  LocalDate date,@ApiParam(value = "None") @Valid @RequestPart(value = "dateTime", required = false)  OffsetDateTime dateTime,@ApiParam(value = "None") @Valid @RequestPart(value = "password", required = false)  String password,@ApiParam(value = "None") @Valid @RequestPart(value = "callback", required = false)  String paramCallback, ServerWebExchange exchange) {
+    default Mono<ResponseEntity<Void>> testEndpointParameters(@ApiParam(value = "None", required=true) @Valid @RequestPart(value = "number", required = true)  BigDecimal number,@ApiParam(value = "None", required=true) @Valid @RequestPart(value = "double", required = true)  Double _double,@ApiParam(value = "None", required=true) @Valid @RequestPart(value = "pattern_without_delimiter", required = true)  String patternWithoutDelimiter,@ApiParam(value = "None", required=true) @Valid @RequestPart(value = "byte", required = true)  byte[] _byte,@ApiParam(value = "None") @Valid @RequestPart(value = "integer", required = false)  Integer integer,@ApiParam(value = "None") @Valid @RequestPart(value = "int32", required = false)  Integer int32,@ApiParam(value = "None") @Valid @RequestPart(value = "int64", required = false)  Long int64,@ApiParam(value = "None") @Valid @RequestPart(value = "float", required = false)  Float _float,@ApiParam(value = "None") @Valid @RequestPart(value = "string", required = false)  String string,@ApiParam(value = "None") @Valid @RequestPart(value = "binary", required = false) Flux<Part> binary,@ApiParam(value = "None") @Valid @RequestPart(value = "date", required = false)  LocalDate date,@ApiParam(value = "None") @Valid @RequestPart(value = "dateTime", required = false)  OffsetDateTime dateTime,@ApiParam(value = "None") @Valid @RequestPart(value = "password", required = false)  String password,@ApiParam(value = "None") @Valid @RequestPart(value = "callback", required = false)  String paramCallback, ServerWebExchange exchange) {
         return getDelegate().testEndpointParameters(number, _double, patternWithoutDelimiter, _byte, integer, int32, int64, _float, string, binary, date, dateTime, password, paramCallback, exchange);
     }
 
@@ -350,7 +351,7 @@ default Mono<ResponseEntity<Void>> testQueryParameterCollectionFormat(@NotNull @
         produces = { "application/json" }, 
         consumes = { "multipart/form-data" },
         method = RequestMethod.POST)
-    default Mono<ResponseEntity<ModelApiResponse>> uploadFileWithRequiredFile(@ApiParam(value = "ID of pet to update",required=true) @PathVariable("petId") Long petId,@ApiParam(value = "file to upload") @Valid @RequestPart(value = "requiredFile", required = true) MultipartFile requiredFile,@ApiParam(value = "Additional data to pass to server") @Valid @RequestPart(value = "additionalMetadata", required = false)  String additionalMetadata, ServerWebExchange exchange) {
+    default Mono<ResponseEntity<ModelApiResponse>> uploadFileWithRequiredFile(@ApiParam(value = "ID of pet to update",required=true) @PathVariable("petId") Long petId,@ApiParam(value = "file to upload") @Valid @RequestPart(value = "requiredFile", required = true) Flux<Part> requiredFile,@ApiParam(value = "Additional data to pass to server") @Valid @RequestPart(value = "additionalMetadata", required = false)  String additionalMetadata, ServerWebExchange exchange) {
         return getDelegate().uploadFileWithRequiredFile(petId, requiredFile, additionalMetadata, exchange);
     }
 
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 e3bf18868356..b834a844fcf6 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
@@ -20,6 +20,7 @@
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import org.springframework.http.codec.multipart.Part;
 
 import java.util.List;
 import java.util.Map;
@@ -210,7 +211,7 @@ default Mono<ResponseEntity<Void>> testEndpointParameters(BigDecimal number,
         Long int64,
         Float _float,
         String string,
-        MultipartFile binary,
+        Flux<Part> binary,
         LocalDate date,
         OffsetDateTime dateTime,
         String password,
@@ -345,7 +346,7 @@ default Mono<ResponseEntity<Void>> testQueryParameterCollectionFormat(List<Strin
      * @see FakeApi#uploadFileWithRequiredFile
      */
     default Mono<ResponseEntity<ModelApiResponse>> uploadFileWithRequiredFile(Long petId,
-        MultipartFile requiredFile,
+        Flux<Part> requiredFile,
         String additionalMetadata,
         ServerWebExchange exchange) {
         Mono<Void> result = Mono.empty();
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeClassnameTestApi.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeClassnameTestApi.java
index c3b92d8b54b2..20d312afdb6d 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeClassnameTestApi.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/FakeClassnameTestApi.java
@@ -21,6 +21,7 @@
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import org.springframework.http.codec.multipart.Part;
 
 import javax.validation.Valid;
 import javax.validation.constraints.*;
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 ea6c1aec4b82..de22e9252564 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
@@ -10,6 +10,7 @@
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import org.springframework.http.codec.multipart.Part;
 
 import java.util.List;
 import java.util.Map;
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/PetApi.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/PetApi.java
index 1eb822dea268..c9bd79cf350c 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/PetApi.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/PetApi.java
@@ -24,6 +24,7 @@
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import org.springframework.http.codec.multipart.Part;
 
 import javax.validation.Valid;
 import javax.validation.constraints.*;
@@ -233,7 +234,7 @@ default Mono<ResponseEntity<Void>> updatePetWithForm(@ApiParam(value = "ID of pe
         produces = { "application/json" }, 
         consumes = { "multipart/form-data" },
         method = RequestMethod.POST)
-    default Mono<ResponseEntity<ModelApiResponse>> uploadFile(@ApiParam(value = "ID of pet to update",required=true) @PathVariable("petId") Long petId,@ApiParam(value = "Additional data to pass to server") @Valid @RequestPart(value = "additionalMetadata", required = false)  String additionalMetadata,@ApiParam(value = "file to upload") @Valid @RequestPart(value = "file", required = false) MultipartFile file, ServerWebExchange exchange) {
+    default Mono<ResponseEntity<ModelApiResponse>> uploadFile(@ApiParam(value = "ID of pet to update",required=true) @PathVariable("petId") Long petId,@ApiParam(value = "Additional data to pass to server") @Valid @RequestPart(value = "additionalMetadata", required = false)  String additionalMetadata,@ApiParam(value = "file to upload") @Valid @RequestPart(value = "file", required = false) Flux<Part> file, ServerWebExchange exchange) {
         return getDelegate().uploadFile(petId, additionalMetadata, file, exchange);
     }
 
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 f8c2b92e9989..19b3ed454094 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
@@ -13,6 +13,7 @@
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import org.springframework.http.codec.multipart.Part;
 
 import java.util.List;
 import java.util.Map;
@@ -200,7 +201,7 @@ default Mono<ResponseEntity<Void>> updatePetWithForm(Long petId,
      */
     default Mono<ResponseEntity<ModelApiResponse>> uploadFile(Long petId,
         String additionalMetadata,
-        MultipartFile file,
+        Flux<Part> file,
         ServerWebExchange exchange) {
         Mono<Void> result = Mono.empty();
         exchange.getResponse().setStatusCode(HttpStatus.NOT_IMPLEMENTED);
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/StoreApi.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/StoreApi.java
index 68b06d86791b..9eadfe25b2bc 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/StoreApi.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/StoreApi.java
@@ -22,6 +22,7 @@
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import org.springframework.http.codec.multipart.Part;
 
 import javax.validation.Valid;
 import javax.validation.constraints.*;
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 37457faadcd1..cf7b723ae561 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
@@ -11,6 +11,7 @@
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import org.springframework.http.codec.multipart.Part;
 
 import java.util.List;
 import java.util.Map;
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/UserApi.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/UserApi.java
index 8a580c56cdac..3fdc4e8197d6 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/UserApi.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/api/UserApi.java
@@ -22,6 +22,7 @@
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import org.springframework.http.codec.multipart.Part;
 
 import javax.validation.Valid;
 import javax.validation.constraints.*;
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 1f80fee7bf99..b40ebabc5cde 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
@@ -11,6 +11,7 @@
 import org.springframework.web.server.ServerWebExchange;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import org.springframework.http.codec.multipart.Part;
 
 import java.util.List;
 import java.util.Map;