[FEAT] Support nullable Array<org.springframework.web.multipart.MultipartFile> in Kotlin-Spring generator (#21994)

* Support nullable `org.springframework.web.multipart.MultipartFile` in Kotlin Spring generator

- nullable is only supported for MultipartFile. However, Array<MultipartFile> could be also nullable

* Support nullable `org.springframework.web.multipart.MultipartFile` in Kotlin Spring generator

* Support nullable `org.springframework.web.multipart.MultipartFile` in Kotlin Spring generator

Update kotlin-spring-additionalproperties samples

modules/openapi-generator/src/main/resources/kotlin-spring/optionalDataType.mustache

@@ -1 +1 @@
-{{^isFile}}{{{dataType}}}{{^required}}{{^defaultValue}}?{{/defaultValue}}{{/required}}{{/isFile}}{{#isFile}}{{#isArray}}Array<{{/isArray}}org.springframework.web.multipart.MultipartFile{{#isArray}}>{{/isArray}}{{^isArray}}{{^required}}?{{/required}}{{/isArray}}{{/isFile}}
+{{^isFile}}{{{dataType}}}{{^required}}{{^defaultValue}}?{{/defaultValue}}{{/required}}{{/isFile}}{{#isFile}}{{#isArray}}Array<{{/isArray}}org.springframework.web.multipart.MultipartFile{{#isArray}}>{{/isArray}}{{#isNullable}}?{{/isNullable}}{{/isFile}}

modules/openapi-generator/src/test/java/org/openapitools/codegen/kotlin/spring/KotlinSpringServerCodegenTest.java

@@ -370,6 +370,44 @@ public class KotlinSpringServerCodegenTest {
                 "ApiUtil");
     }
 
+
+    @Test
+    public void testNullableMultipartFile() throws IOException {
+        File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
+        output.deleteOnExit();
+        String outputPath = output.getAbsolutePath().replace('\\', '/');
+
+        OpenAPI openAPI = new OpenAPIParser()
+                .readLocation("src/test/resources/3_0/kotlin/feat-multipartfile_nullable.yaml", null, new ParseOptions()).getOpenAPI();
+
+        KotlinSpringServerCodegen codegen = new KotlinSpringServerCodegen();
+        codegen.setOutputDir(output.getAbsolutePath());
+        codegen.additionalProperties().put(CXFServerFeatures.LOAD_TEST_DATA_FROM_FILE, "true");
+
+        ClientOptInput input = new ClientOptInput();
+        input.openAPI(openAPI);
+        input.config(codegen);
+
+        DefaultGenerator generator = new DefaultGenerator();
+
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODELS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_TESTS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_DOCS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.APIS, "true");
+        generator.setGeneratorPropertyDefault(CodegenConstants.SUPPORTING_FILES, "false");
+
+        generator.opts(input).generate();
+
+        assertFileContains(Paths.get(outputPath + "/src/main/kotlin/org/openapitools/api/NullableMultipartfileApiController.kt"),
+                "file: org.springframework.web.multipart.MultipartFile?)");
+        assertFileContains(Paths.get(outputPath + "/src/main/kotlin/org/openapitools/api/NullableMultipartfileArrayApiController.kt"),
+                "files: Array<org.springframework.web.multipart.MultipartFile>?)");
+        assertFileContains(Paths.get(outputPath + "/src/main/kotlin/org/openapitools/api/NonNullableMultipartfileApiController.kt"),
+                "file: org.springframework.web.multipart.MultipartFile)");
+        assertFileContains(Paths.get(outputPath + "/src/main/kotlin/org/openapitools/api/NonNullableMultipartfileArrayApiController.kt"),
+                "files: Array<org.springframework.web.multipart.MultipartFile>)");
+    }
+
     @Test
     public void arrayItemsCanBeNullable() throws IOException {
         File output = Files.createTempDirectory("test").toFile().getCanonicalFile();

modules/openapi-generator/src/test/resources/3_0/kotlin/feat-multipartfile_nullable.yaml

@@ -0,0 +1,182 @@
+openapi: 3.0.0
+servers:
+  - url: 'https://example.org/v1'
+info:
+  description: >-
+    Example created for nullable multipartfile issue
+  version: 1.0.0
+  title: OpenAPI Stuff API created to reproduce issue
+  license:
+    name: Apache-2.0
+    url: 'https://www.apache.org/licenses/LICENSE-2.0.html'
+tags:
+  - name: multipartfile
+    description: All about the nullable multipartfile
+security:
+  - bearerAuth: []
+paths:
+  /nullable-multipartfile:
+    post:
+      tags:
+        - multipartfile
+      summary: simple nullable multipartfile
+      operationId: testNullableMultipartfile
+      requestBody:
+        content:
+          multipart/form-data:
+            schema:
+              type: object
+              properties:
+                file:
+                  type: string
+                  description: File to upload
+                  format: binary
+                  nullable: true
+                jsonPayload:
+                  type: object
+                  description: simple json payload
+                  properties:
+                    name:
+                      type: string
+              required:
+                - jsonPayload
+      responses:
+        '200':
+          description: successful operation
+          content:
+            application/json:
+              schema:
+                type: string
+        '400':
+          description: Invalid status value
+
+  /nullable-multipartfile-array:
+    post:
+      tags:
+        - multipartfile
+      summary: simple nullable multipartfile
+      operationId: testNullableMultipartfile
+      requestBody:
+        content:
+          multipart/form-data:
+            schema:
+              type: object
+              properties:
+                files:
+                  type: array
+                  items:
+                    type: string
+                    description: File to upload
+                    format: binary
+                  nullable: true
+                jsonPayload:
+                  type: object
+                  description: simple json payload
+                  properties:
+                    name:
+                      type: string
+              required:
+                - jsonPayload
+      responses:
+        '200':
+          description: successful operation
+          content:
+            application/json:
+              schema:
+                type: string
+        '400':
+          description: Invalid status value
+  /non-nullable-multipartfile:
+    post:
+      tags:
+        - multipartfile
+      summary: simple non nullable multipartfile
+      operationId: testNonNullableMultipartfile
+      requestBody:
+        content:
+          multipart/form-data:
+            schema:
+              type: object
+              properties:
+                file:
+                  type: string
+                  description: File to upload
+                  format: binary
+                  nullable: false
+                jsonPayload:
+                  type: object
+                  description: simple json payload
+                  properties:
+                    name:
+                      type: string
+              required:
+                - jsonPayload
+      responses:
+        '200':
+          description: successful operation
+          content:
+            application/json:
+              schema:
+                type: string
+        '400':
+          description: Invalid status value
+
+  /non-nullable-multipartfile-array:
+    post:
+      tags:
+        - multipartfile
+      summary: simple non nullable multipartfile
+      operationId: testNonNullableMultipartfile
+      requestBody:
+        content:
+          multipart/form-data:
+            schema:
+              type: object
+              properties:
+                files:
+                  type: array
+                  items:
+                    type: string
+                    description: File to upload
+                    format: binary
+                  nullable: false
+                jsonPayload:
+                  type: object
+                  description: simple json payload
+                  properties:
+                    name:
+                      type: string
+              required:
+                - jsonPayload
+      responses:
+        '200':
+          description: successful operation
+          content:
+            application/json:
+              schema:
+                type: string
+        '400':
+          description: Invalid status value
+externalDocs:
+  description: Find out more about Swagger
+  url: 'http://swagger.io'
+components:
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT
+  schemas:
+    Stuff:
+      type: object
+      properties:
+        id:
+          type: integer
+          format: int64
+        name:
+          type: string
+        tag:
+          type: string
+      required:
+        - name
+

samples/server/petstore/kotlin-spring-cloud/src/main/kotlin/org/openapitools/api/PetApi.kt

@@ -110,7 +110,7 @@ interface PetApi {
             produces = ["application/json"],
             consumes = ["multipart/form-data"]
     )
-    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(HttpStatus.NOT_IMPLEMENTED)
     }
 }

samples/server/petstore/kotlin-spring-default/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -176,7 +176,7 @@ class PetApiController() {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(HttpStatus.NOT_IMPLEMENTED)
     }
 }

samples/server/petstore/kotlin-springboot-3/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -106,7 +106,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }

samples/server/petstore/kotlin-springboot-3/src/main/kotlin/org/openapitools/api/PetApiService.kt

@@ -99,5 +99,5 @@ interface PetApiService {
      * @return successful operation (status code 200)
      * @see PetApi#uploadFile
      */
-    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse
+    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse
 }

samples/server/petstore/kotlin-springboot-3/src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt

@@ -34,7 +34,7 @@ class PetApiServiceImpl : PetApiService {
         TODO("Implement me")
     }
 
-    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse {
+    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse {
         TODO("Implement me")
     }
 }

samples/server/petstore/kotlin-springboot-additionalproperties/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -106,7 +106,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }

samples/server/petstore/kotlin-springboot-additionalproperties/src/main/kotlin/org/openapitools/api/PetApiService.kt

@@ -99,5 +99,5 @@ interface PetApiService {
      * @return successful operation (status code 200)
      * @see PetApi#uploadFile
      */
-    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse
+    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse
 }

samples/server/petstore/kotlin-springboot-additionalproperties/src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt

@@ -34,7 +34,7 @@ class PetApiServiceImpl : PetApiService {
         TODO("Implement me")
     }
 
-    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse {
+    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse {
         TODO("Implement me")
     }
 }

samples/server/petstore/kotlin-springboot-delegate-nodefaults/src/main/kotlin/org/openapitools/api/PetApi.kt

@@ -199,7 +199,7 @@ interface PetApi {
             produces = ["application/json"],
             consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse> {
         return getDelegate().uploadFile(petId, additionalMetadata, file)
     }
 }

samples/server/petstore/kotlin-springboot-delegate-nodefaults/src/main/kotlin/org/openapitools/api/PetApiDelegate.kt

@@ -68,6 +68,6 @@ interface PetApiDelegate {
      */
     fun uploadFile(petId: kotlin.Long,
         additionalMetadata: kotlin.String?,
-        file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse>
+        file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse>
 
 }

samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/api/PetApi.kt

@@ -198,7 +198,7 @@ interface PetApi {
             produces = ["application/json"],
             consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse> {
         return getDelegate().uploadFile(petId, additionalMetadata, file)
     }
 }

samples/server/petstore/kotlin-springboot-delegate/src/main/kotlin/org/openapitools/api/PetApiDelegate.kt

@@ -150,7 +150,7 @@ interface PetApiDelegate {
      */
     fun uploadFile(petId: kotlin.Long,
         additionalMetadata: kotlin.String?,
-        file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+        file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse> {
         getRequest().ifPresent { request ->
             for (mediaType in MediaType.parseMediaTypes(request.getHeader("Accept"))) {
                 if (mediaType.isCompatibleWith(MediaType.valueOf("application/json"))) {

samples/server/petstore/kotlin-springboot-modelMutable/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -172,7 +172,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }

samples/server/petstore/kotlin-springboot-modelMutable/src/main/kotlin/org/openapitools/api/PetApiService.kt

@@ -90,5 +90,5 @@ interface PetApiService {
      * @return successful operation (status code 200)
      * @see PetApi#uploadFile
      */
-    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse
+    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse
 }

samples/server/petstore/kotlin-springboot-modelMutable/src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt

@@ -34,7 +34,7 @@ class PetApiServiceImpl : PetApiService {
         TODO("Implement me")
     }
 
-    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse {
+    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse {
         TODO("Implement me")
     }
 }

samples/server/petstore/kotlin-springboot-reactive-without-flow/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -177,7 +177,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    suspend fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    suspend fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }

samples/server/petstore/kotlin-springboot-reactive-without-flow/src/main/kotlin/org/openapitools/api/PetApiService.kt

@@ -100,5 +100,5 @@ interface PetApiService {
      * @return successful operation (status code 200)
      * @see PetApi#uploadFile
      */
-    suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse
+    suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse
 }

samples/server/petstore/kotlin-springboot-reactive-without-flow/src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt

@@ -35,7 +35,7 @@ class PetApiServiceImpl : PetApiService {
         TODO("Implement me")
     }
 
-    override suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse {
+    override suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse {
         TODO("Implement me")
     }
 }

samples/server/petstore/kotlin-springboot-reactive/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -177,7 +177,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    suspend fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    suspend fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }

samples/server/petstore/kotlin-springboot-reactive/src/main/kotlin/org/openapitools/api/PetApiService.kt

@@ -100,5 +100,5 @@ interface PetApiService {
      * @return successful operation (status code 200)
      * @see PetApi#uploadFile
      */
-    suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse
+    suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse
 }

samples/server/petstore/kotlin-springboot-reactive/src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt

@@ -35,7 +35,7 @@ class PetApiServiceImpl : PetApiService {
         TODO("Implement me")
     }
 
-    override suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse {
+    override suspend fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse {
         TODO("Implement me")
     }
 }

samples/server/petstore/kotlin-springboot-request-cookie/src/main/kotlin/org/openapitools/api/PetApi.kt

@@ -196,7 +196,7 @@ interface PetApi {
             produces = ["application/json"],
             consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(HttpStatus.NOT_IMPLEMENTED)
     }
 }

samples/server/petstore/kotlin-springboot-source-swagger1/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -175,7 +175,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@ApiParam(value = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@ApiParam(value = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@ApiParam(value = "file detail") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@ApiParam(value = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@ApiParam(value = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@ApiParam(value = "file detail") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }

samples/server/petstore/kotlin-springboot-source-swagger1/src/main/kotlin/org/openapitools/api/PetApiService.kt

@@ -90,5 +90,5 @@ interface PetApiService {
      * @return successful operation (status code 200)
      * @see PetApi#uploadFile
      */
-    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse
+    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse
 }

samples/server/petstore/kotlin-springboot-source-swagger1/src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt

@@ -34,7 +34,7 @@ class PetApiServiceImpl : PetApiService {
         TODO("Implement me")
     }
 
-    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse {
+    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse {
         TODO("Implement me")
     }
 }

samples/server/petstore/kotlin-springboot-source-swagger2/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -172,7 +172,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@Parameter(description = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@Parameter(description = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@Parameter(description = "file to upload") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }

samples/server/petstore/kotlin-springboot-source-swagger2/src/main/kotlin/org/openapitools/api/PetApiService.kt

@@ -90,5 +90,5 @@ interface PetApiService {
      * @return successful operation (status code 200)
      * @see PetApi#uploadFile
      */
-    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse
+    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse
 }

samples/server/petstore/kotlin-springboot-source-swagger2/src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt

@@ -34,7 +34,7 @@ class PetApiServiceImpl : PetApiService {
         TODO("Implement me")
     }
 
-    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse {
+    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse {
         TODO("Implement me")
     }
 }

samples/server/petstore/kotlin-springboot-springfox/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -175,7 +175,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile(@ApiParam(value = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@ApiParam(value = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@ApiParam(value = "file detail") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile(@ApiParam(value = "ID of pet to update", required = true) @PathVariable("petId") petId: kotlin.Long,@ApiParam(value = "Additional data to pass to server") @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? ,@ApiParam(value = "file detail") @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }

samples/server/petstore/kotlin-springboot-springfox/src/main/kotlin/org/openapitools/api/PetApiService.kt

@@ -90,5 +90,5 @@ interface PetApiService {
      * @return successful operation (status code 200)
      * @see PetApi#uploadFile
      */
-    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse
+    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse
 }

samples/server/petstore/kotlin-springboot-springfox/src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt

@@ -34,7 +34,7 @@ class PetApiServiceImpl : PetApiService {
         TODO("Implement me")
     }
 
-    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse {
+    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse {
         TODO("Implement me")
     }
 }

samples/server/petstore/kotlin-springboot-x-kotlin-implements/src/main/kotlin/org/openapitools/api/PetApi.kt

@@ -95,5 +95,5 @@ interface PetApi {
             produces = ["application/json"],
             consumes = ["multipart/form-data"]
     )
-    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse>
+    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse>
 }

samples/server/petstore/kotlin-springboot/src/main/kotlin/org/openapitools/api/PetApiController.kt

@@ -105,7 +105,7 @@ class PetApiController(@Autowired(required = true) val service: PetApiService) {
         produces = ["application/json"],
         consumes = ["multipart/form-data"]
     )
-    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile?): ResponseEntity<ModelApiResponse> {
+    fun uploadFile( @PathVariable("petId") petId: kotlin.Long, @Valid @RequestParam(value = "additionalMetadata", required = false) additionalMetadata: kotlin.String? , @Valid @RequestPart("file", required = false) file: org.springframework.web.multipart.MultipartFile): ResponseEntity<ModelApiResponse> {
         return ResponseEntity(service.uploadFile(petId, additionalMetadata, file), HttpStatus.valueOf(200))
     }
 }

samples/server/petstore/kotlin-springboot/src/main/kotlin/org/openapitools/api/PetApiService.kt

@@ -90,5 +90,5 @@ interface PetApiService {
      * @return successful operation (status code 200)
      * @see PetApi#uploadFile
      */
-    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse
+    fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse
 }

samples/server/petstore/kotlin-springboot/src/main/kotlin/org/openapitools/api/PetApiServiceImpl.kt

@@ -34,7 +34,7 @@ class PetApiServiceImpl : PetApiService {
         TODO("Implement me")
     }
 
-    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile?): ModelApiResponse {
+    override fun uploadFile(petId: kotlin.Long, additionalMetadata: kotlin.String?, file: org.springframework.web.multipart.MultipartFile): ModelApiResponse {
         TODO("Implement me")
     }
 }