diff --git a/.github/workflows/samples-kotlin-server.yaml b/.github/workflows/samples-kotlin-server.yaml
index b98d4c69532a..be8be39d2f57 100644
--- a/.github/workflows/samples-kotlin-server.yaml
+++ b/.github/workflows/samples-kotlin-server.yaml
@@ -29,6 +29,7 @@ jobs:
         sample:
           # server
           - samples/server/petstore/kotlin-springboot
+          - samples/server/petstore/kotlin-springboot-multipart-request-model
           - samples/server/petstore/kotlin-springboot-bigdecimal-default
           - samples/server/petstore/kotlin-springboot-delegate
           - samples/server/petstore/kotlin-springboot-modelMutable
diff --git a/bin/configs/kotlin-spring-boot-multipart-request-model.yaml b/bin/configs/kotlin-spring-boot-multipart-request-model.yaml
new file mode 100644
index 000000000000..63d0b59fd5bb
--- /dev/null
+++ b/bin/configs/kotlin-spring-boot-multipart-request-model.yaml
@@ -0,0 +1,5 @@
+generatorName: kotlin-spring
+outputDir: samples/server/petstore/kotlin-springboot-multipart-request-model
+library: spring-boot
+inputSpec: modules/openapi-generator/src/test/resources/3_0/issue_15251_multipart_request_model.yaml
+templateDir: modules/openapi-generator/src/main/resources/kotlin-spring
diff --git a/modules/openapi-generator/src/main/resources/kotlin-spring/formParams.mustache b/modules/openapi-generator/src/main/resources/kotlin-spring/formParams.mustache
index 6d725334a165..3d1a5787e382 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-spring/formParams.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-spring/formParams.mustache
@@ -1 +1 @@
-{{#isFormParam}}{{^isFile}}{{#swagger2AnnotationLibrary}}@Parameter(description = "{{{description}}}"{{#required}}, required = true{{/required}}{{#allowableValues}}{{#defaultValue}}, schema = Schema(allowableValues = [{{#values}}"{{{.}}}"{{^-last}}, {{/-last}}{{/values}}]{{^isContainer}}, defaultValue = {{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{/isContainer}}){{/defaultValue}}{{/allowableValues}}{{#allowableValues}}{{^defaultValue}}, schema = Schema(allowableValues = [{{#values}}"{{{.}}}"{{^-last}}, {{/-last}}{{/values}}]){{/defaultValue}}{{/allowableValues}}{{^allowableValues}}{{#defaultValue}}{{^isContainer}}, schema = Schema(defaultValue = {{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}){{/isContainer}}{{/defaultValue}}{{/allowableValues}}){{/swagger2AnnotationLibrary}}{{#swagger1AnnotationLibrary}}@ApiParam(value = "{{{description}}}"{{#required}}, required = true{{/required}}{{#allowableValues}}, allowableValues = "{{#values}}{{{.}}}{{^-last}}, {{/-last}}{{/values}}"{{/allowableValues}}{{#defaultValue}}, defaultValue = "{{{.}}}"{{/defaultValue}}){{/swagger1AnnotationLibrary}} @RequestParam(value = "{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}) {{{paramName}}}: {{>optionalDataType}} {{/isFile}}{{#isFile}}{{#swagger2AnnotationLibrary}}@Parameter(description = "{{{description}}}"){{/swagger2AnnotationLibrary}}{{#swagger1AnnotationLibrary}}@ApiParam(value = "file detail"){{/swagger1AnnotationLibrary}} {{#useBeanValidation}}@Valid{{/useBeanValidation}} @RequestPart("{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}) {{{paramName}}}: {{>optionalDataType}}{{/isFile}}{{/isFormParam}}
\ No newline at end of file
+{{#isFormParam}}{{^isFile}}{{#swagger2AnnotationLibrary}}@Parameter(description = "{{{description}}}"{{#required}}, required = true{{/required}}{{#allowableValues}}{{#defaultValue}}, schema = Schema(allowableValues = [{{#values}}"{{{.}}}"{{^-last}}, {{/-last}}{{/values}}]{{^isContainer}}, defaultValue = {{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{/isContainer}}){{/defaultValue}}{{/allowableValues}}{{#allowableValues}}{{^defaultValue}}, schema = Schema(allowableValues = [{{#values}}"{{{.}}}"{{^-last}}, {{/-last}}{{/values}}]){{/defaultValue}}{{/allowableValues}}{{^allowableValues}}{{#defaultValue}}{{^isContainer}}, schema = Schema(defaultValue = {{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}){{/isContainer}}{{/defaultValue}}{{/allowableValues}}){{/swagger2AnnotationLibrary}}{{#swagger1AnnotationLibrary}}@ApiParam(value = "{{{description}}}"{{#required}}, required = true{{/required}}{{#allowableValues}}, allowableValues = "{{#values}}{{{.}}}{{^-last}}, {{/-last}}{{/values}}"{{/allowableValues}}{{#defaultValue}}, defaultValue = "{{{.}}}"{{/defaultValue}}){{/swagger1AnnotationLibrary}} {{#isModel}}@RequestPart{{/isModel}}{{^isModel}}@RequestParam{{/isModel}}(value = "{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}) {{{paramName}}}: {{>optionalDataType}} {{/isFile}}{{#isFile}}{{#swagger2AnnotationLibrary}}@Parameter(description = "{{{description}}}"){{/swagger2AnnotationLibrary}}{{#swagger1AnnotationLibrary}}@ApiParam(value = "file detail"){{/swagger1AnnotationLibrary}} {{#useBeanValidation}}@Valid{{/useBeanValidation}} @RequestPart("{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}) {{{paramName}}}: {{>optionalDataType}}{{/isFile}}{{/isFormParam}}
\ No newline at end of file
diff --git a/modules/openapi-generator/src/test/resources/3_0/issue_15251_multipart_request_model.yaml b/modules/openapi-generator/src/test/resources/3_0/issue_15251_multipart_request_model.yaml
new file mode 100644
index 000000000000..5a95b5437182
--- /dev/null
+++ b/modules/openapi-generator/src/test/resources/3_0/issue_15251_multipart_request_model.yaml
@@ -0,0 +1,45 @@
+openapi: '3.0.1'
+info:
+  version: 1.0.0
+  title: MultipartFile test
+paths:
+  /multipart-mixed:
+    post:
+      tags:
+        - multipart
+      description: Mixed MultipartFile test
+      operationId: multipartMixed
+      requestBody:
+        content:
+          multipart/form-data:
+            schema:
+              type: object
+              required:
+                - status
+                - file
+              properties:
+                status:
+                  $ref: '#/components/schemas/MultipartMixedStatus'
+                marker:
+                  description: "additional object"
+                  type: object
+                  properties:
+                    name:
+                      type: string
+                file:
+                  description: "a file"
+                  type: string
+                  format: binary
+      responses:
+        '204':
+          description: Successful operation
+components:
+  schemas:
+    MultipartMixedStatus:
+      description: "additional field as Enum"
+      type: string
+      enum:
+        - ALLOWED
+        - IN_PROGRESS
+        - REJECTED
+      example: REJECTED
\ No newline at end of file
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/.openapi-generator-ignore b/samples/server/petstore/kotlin-springboot-multipart-request-model/.openapi-generator-ignore
new file mode 100644
index 000000000000..7484ee590a38
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/.openapi-generator-ignore
@@ -0,0 +1,23 @@
+# OpenAPI Generator Ignore
+# Generated by openapi-generator https://github.com/openapitools/openapi-generator
+
+# Use this file to prevent files from being overwritten by the generator.
+# The patterns follow closely to .gitignore or .dockerignore.
+
+# As an example, the C# client generator defines ApiClient.cs.
+# You can make changes and tell OpenAPI Generator to ignore just this file by uncommenting the following line:
+#ApiClient.cs
+
+# You can match any string of characters against a directory, file or extension with a single asterisk (*):
+#foo/*/qux
+# The above matches foo/bar/qux and foo/baz/qux, but not foo/bar/baz/qux
+
+# You can recursively match patterns against a directory, file or extension with a double asterisk (**):
+#foo/**/qux
+# This matches foo/bar/qux, foo/baz/qux, and foo/bar/baz/qux
+
+# You can also negate patterns with an exclamation (!).
+# For example, you can ignore all files in a docs folder with the file extension .md:
+#docs/*.md
+# Then explicitly reverse the ignore rule for a single file:
+#!docs/README.md
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/.openapi-generator/FILES b/samples/server/petstore/kotlin-springboot-multipart-request-model/.openapi-generator/FILES
new file mode 100644
index 000000000000..0afcf84b1ed1
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/.openapi-generator/FILES
@@ -0,0 +1,14 @@
+README.md
+build.gradle.kts
+pom.xml
+settings.gradle
+src/main/kotlin/org/openapitools/Application.kt
+src/main/kotlin/org/openapitools/HomeController.kt
+src/main/kotlin/org/openapitools/SpringDocConfiguration.kt
+src/main/kotlin/org/openapitools/api/ApiUtil.kt
+src/main/kotlin/org/openapitools/api/Exceptions.kt
+src/main/kotlin/org/openapitools/api/MultipartMixedApiController.kt
+src/main/kotlin/org/openapitools/model/MultipartMixedRequestMarker.kt
+src/main/kotlin/org/openapitools/model/MultipartMixedStatus.kt
+src/main/resources/application.yaml
+src/main/resources/openapi.yaml
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/.openapi-generator/VERSION b/samples/server/petstore/kotlin-springboot-multipart-request-model/.openapi-generator/VERSION
new file mode 100644
index 000000000000..6116b14d2c59
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/.openapi-generator/VERSION
@@ -0,0 +1 @@
+7.8.0-SNAPSHOT
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/README.md b/samples/server/petstore/kotlin-springboot-multipart-request-model/README.md
new file mode 100644
index 000000000000..15d74ea2ce25
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/README.md
@@ -0,0 +1,21 @@
+# multipartFileTest
+
+This Kotlin based [Spring Boot](https://spring.io/projects/spring-boot) application has been generated using the [OpenAPI Generator](https://github.com/OpenAPITools/openapi-generator).
+
+## Getting Started
+
+This document assumes you have either maven or gradle available, either via the wrapper or otherwise. This does not come with a gradle / maven wrapper checked in.
+
+By default a [`pom.xml`](pom.xml) file will be generated. If you specified `gradleBuildFile=true` when generating this project, a `build.gradle.kts` will also be generated. Note this uses [Gradle Kotlin DSL](https://github.com/gradle/kotlin-dsl).
+
+To build the project using maven, run:
+```bash
+mvn package && java -jar target/openapi-spring-1.0.0.jar
+```
+
+To build the project using gradle, run:
+```bash
+gradle build && java -jar build/libs/openapi-spring-1.0.0.jar
+```
+
+If all builds successfully, the server should run on [http://localhost:8080/](http://localhost:8080/)
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/build.gradle.kts b/samples/server/petstore/kotlin-springboot-multipart-request-model/build.gradle.kts
new file mode 100644
index 000000000000..45a8ef30f3ef
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/build.gradle.kts
@@ -0,0 +1,50 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+buildscript {
+    repositories {
+        mavenCentral()
+    }
+    dependencies {
+        classpath("org.springframework.boot:spring-boot-gradle-plugin:2.6.7")
+    }
+}
+
+group = "org.openapitools"
+version = "1.0.0"
+
+repositories {
+    mavenCentral()
+}
+
+tasks.withType<KotlinCompile> {
+    kotlinOptions.jvmTarget = "1.8"
+}
+
+plugins {
+    val kotlinVersion = "1.6.21"
+    id("org.jetbrains.kotlin.jvm") version kotlinVersion
+    id("org.jetbrains.kotlin.plugin.jpa") version kotlinVersion
+    id("org.jetbrains.kotlin.plugin.spring") version kotlinVersion
+    id("org.springframework.boot") version "2.6.7"
+    id("io.spring.dependency-management") version "1.0.11.RELEASE"
+}
+
+dependencies {
+    compile("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+    compile("org.jetbrains.kotlin:kotlin-reflect")
+    compile("org.springframework.boot:spring-boot-starter-web")
+    compile("org.springdoc:springdoc-openapi-ui:1.6.8")
+
+    compile("com.google.code.findbugs:jsr305:3.0.2")
+    compile("com.fasterxml.jackson.dataformat:jackson-dataformat-yaml")
+    compile("com.fasterxml.jackson.dataformat:jackson-dataformat-xml")
+    compile("com.fasterxml.jackson.datatype:jackson-datatype-jsr310")
+    compile("com.fasterxml.jackson.module:jackson-module-kotlin")
+    compile("jakarta.validation:jakarta.validation-api")
+    compile("jakarta.annotation:jakarta.annotation-api:2.1.0")
+
+    testCompile("org.jetbrains.kotlin:kotlin-test-junit5")
+    testCompile("org.springframework.boot:spring-boot-starter-test") {
+        exclude(module = "junit")
+    }
+}
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/pom.xml b/samples/server/petstore/kotlin-springboot-multipart-request-model/pom.xml
new file mode 100644
index 000000000000..a44254101c24
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/pom.xml
@@ -0,0 +1,136 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>org.openapitools</groupId>
+    <artifactId>openapi-spring</artifactId>
+    <packaging>jar</packaging>
+    <name>openapi-spring</name>
+    <version>1.0.0</version>
+    <properties>
+        <springdoc-openapi.version>1.6.8</springdoc-openapi.version>
+        <findbugs-jsr305.version>3.0.2</findbugs-jsr305.version>
+        <jakarta-annotation.version>2.1.0</jakarta-annotation.version>
+        <kotlin-test-junit5.version>1.6.21</kotlin-test-junit5.version>
+
+        <kotlin.version>1.6.21</kotlin.version>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.7.15</version>
+    </parent>
+    <build>
+        <sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
+        <testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>repackage</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <artifactId>kotlin-maven-plugin</artifactId>
+                <groupId>org.jetbrains.kotlin</groupId>
+                <version>${kotlin.version}</version>
+                <configuration>
+                    <compilerPlugins>
+                        <plugin>spring</plugin>
+                    </compilerPlugins>
+                    <jvmTarget>1.8</jvmTarget>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>compile</id>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>test-compile</id>
+                        <phase>test-compile</phase>
+                        <goals>
+                            <goal>test-compile</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <dependencies>
+                    <dependency>
+                        <groupId>org.jetbrains.kotlin</groupId>
+                        <artifactId>kotlin-maven-allopen</artifactId>
+                        <version>${kotlin.version}</version>
+                    </dependency>
+                </dependencies>
+            </plugin>
+        </plugins>
+    </build>
+    <dependencies>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-stdlib-jdk8</artifactId>
+            <version>${kotlin.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-reflect</artifactId>
+            <version>${kotlin.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <!--SpringDoc dependencies -->
+        <dependency>
+            <groupId>org.springdoc</groupId>
+            <artifactId>springdoc-openapi-ui</artifactId>
+            <version>${springdoc-openapi.version}</version>
+        </dependency>
+
+        <!-- @Nullable annotation -->
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>${findbugs-jsr305.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.dataformat</groupId>
+            <artifactId>jackson-dataformat-yaml</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.dataformat</groupId>
+            <artifactId>jackson-dataformat-xml</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.datatype</groupId>
+            <artifactId>jackson-datatype-jsr310</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.module</groupId>
+            <artifactId>jackson-module-kotlin</artifactId>
+        </dependency>
+        <!-- Bean Validation API support -->
+        <dependency>
+            <groupId>jakarta.validation</groupId>
+            <artifactId>jakarta.validation-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>jakarta.annotation</groupId>
+            <artifactId>jakarta.annotation-api</artifactId>
+            <version>${jakarta-annotation.version}</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-test-junit5</artifactId>
+            <version>${kotlin-test-junit5.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+</project>
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/settings.gradle b/samples/server/petstore/kotlin-springboot-multipart-request-model/settings.gradle
new file mode 100644
index 000000000000..14844905cd40
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/settings.gradle
@@ -0,0 +1,15 @@
+pluginManagement {
+    repositories {
+        maven { url = uri("https://repo.spring.io/snapshot") }
+        maven { url = uri("https://repo.spring.io/milestone") }
+        gradlePluginPortal()
+    }
+    resolutionStrategy {
+        eachPlugin {
+            if (requested.id.id == "org.springframework.boot") {
+                useModule("org.springframework.boot:spring-boot-gradle-plugin:${requested.version}")
+            }
+        }
+    }
+}
+rootProject.name = "openapi-spring"
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/Application.kt b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/Application.kt
new file mode 100644
index 000000000000..2fe6de62479e
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/Application.kt
@@ -0,0 +1,13 @@
+package org.openapitools
+
+import org.springframework.boot.runApplication
+import org.springframework.boot.autoconfigure.SpringBootApplication
+import org.springframework.context.annotation.ComponentScan
+
+@SpringBootApplication
+@ComponentScan(basePackages = ["org.openapitools", "org.openapitools.api", "org.openapitools.model"])
+class Application
+
+fun main(args: Array<String>) {
+    runApplication<Application>(*args)
+}
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/HomeController.kt b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/HomeController.kt
new file mode 100644
index 000000000000..0b75544d7a1e
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/HomeController.kt
@@ -0,0 +1,17 @@
+package org.openapitools
+
+import org.springframework.context.annotation.Bean
+import org.springframework.stereotype.Controller
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.ResponseBody
+import org.springframework.web.bind.annotation.GetMapping
+
+/**
+ * Home redirection to OpenAPI api documentation
+ */
+@Controller
+class HomeController {
+
+    @RequestMapping("/")
+    fun index(): String = "redirect:swagger-ui.html"
+}
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/SpringDocConfiguration.kt b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/SpringDocConfiguration.kt
new file mode 100644
index 000000000000..2e11661edd00
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/SpringDocConfiguration.kt
@@ -0,0 +1,26 @@
+package org.openapitools
+
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+
+import io.swagger.v3.oas.models.OpenAPI
+import io.swagger.v3.oas.models.info.Info
+import io.swagger.v3.oas.models.info.Contact
+import io.swagger.v3.oas.models.info.License
+import io.swagger.v3.oas.models.Components
+import io.swagger.v3.oas.models.security.SecurityScheme
+
+@Configuration
+class SpringDocConfiguration {
+
+    @Bean
+    fun apiInfo(): OpenAPI {
+        return OpenAPI()
+            .info(
+                Info()
+                    .title("MultipartFile test")
+                    .description("No description provided (generated by Openapi Generator https://github.com/openapitools/openapi-generator)")
+                    .version("1.0.0")
+            )
+    }
+}
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/api/ApiUtil.kt b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/api/ApiUtil.kt
new file mode 100644
index 000000000000..88e892d0f49a
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/api/ApiUtil.kt
@@ -0,0 +1,19 @@
+package org.openapitools.api
+
+import org.springframework.web.context.request.NativeWebRequest
+
+import javax.servlet.http.HttpServletResponse
+import java.io.IOException
+
+object ApiUtil {
+    fun setExampleResponse(req: NativeWebRequest, contentType: String, example: String) {
+        try {
+            val res = req.getNativeResponse(HttpServletResponse::class.java)
+            res?.characterEncoding = "UTF-8"
+            res?.addHeader("Content-Type", contentType)
+            res?.writer?.print(example)
+        } catch (e: IOException) {
+            throw RuntimeException(e)
+        }
+    }
+}
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/api/Exceptions.kt b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/api/Exceptions.kt
new file mode 100644
index 000000000000..44190af7a019
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/api/Exceptions.kt
@@ -0,0 +1,29 @@
+package org.openapitools.api
+
+import org.springframework.http.HttpStatus
+import org.springframework.web.bind.annotation.ControllerAdvice
+import org.springframework.web.bind.annotation.ExceptionHandler
+import javax.servlet.http.HttpServletResponse
+import javax.validation.ConstraintViolationException
+
+// TODO Extend ApiException for custom exception handling, e.g. the below NotFound exception
+sealed class ApiException(msg: String, val code: Int) : Exception(msg)
+
+class NotFoundException(msg: String, code: Int = HttpStatus.NOT_FOUND.value()) : ApiException(msg, code)
+
+
+@ControllerAdvice
+class DefaultExceptionHandler {
+
+    @ExceptionHandler(value = [ApiException::class])
+    fun onApiException(ex: ApiException, response: HttpServletResponse): Unit =
+        response.sendError(ex.code, ex.message)
+
+    @ExceptionHandler(value = [NotImplementedError::class])
+    fun onNotImplemented(ex: NotImplementedError, response: HttpServletResponse): Unit =
+        response.sendError(HttpStatus.NOT_IMPLEMENTED.value())
+
+    @ExceptionHandler(value = [ConstraintViolationException::class])
+    fun onConstraintViolation(ex: ConstraintViolationException, response: HttpServletResponse): Unit =
+        response.sendError(HttpStatus.BAD_REQUEST.value(), ex.constraintViolations.joinToString(", ") { it.message })
+}
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/api/MultipartMixedApiController.kt b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/api/MultipartMixedApiController.kt
new file mode 100644
index 000000000000..a2b304ac2f29
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/api/MultipartMixedApiController.kt
@@ -0,0 +1,52 @@
+package org.openapitools.api
+
+import org.openapitools.model.MultipartMixedRequestMarker
+import org.openapitools.model.MultipartMixedStatus
+import io.swagger.v3.oas.annotations.*
+import io.swagger.v3.oas.annotations.enums.*
+import io.swagger.v3.oas.annotations.media.*
+import io.swagger.v3.oas.annotations.responses.*
+import io.swagger.v3.oas.annotations.security.*
+import org.springframework.http.HttpStatus
+import org.springframework.http.MediaType
+import org.springframework.http.ResponseEntity
+
+import org.springframework.web.bind.annotation.*
+import org.springframework.validation.annotation.Validated
+import org.springframework.web.context.request.NativeWebRequest
+import org.springframework.beans.factory.annotation.Autowired
+
+import javax.validation.Valid
+import javax.validation.constraints.DecimalMax
+import javax.validation.constraints.DecimalMin
+import javax.validation.constraints.Email
+import javax.validation.constraints.Max
+import javax.validation.constraints.Min
+import javax.validation.constraints.NotNull
+import javax.validation.constraints.Pattern
+import javax.validation.constraints.Size
+
+import kotlin.collections.List
+import kotlin.collections.Map
+
+@RestController
+@Validated
+@RequestMapping("\${api.base-path:}")
+class MultipartMixedApiController() {
+
+    @Operation(
+        summary = "",
+        operationId = "multipartMixed",
+        description = """Mixed MultipartFile test""",
+        responses = [
+            ApiResponse(responseCode = "204", description = "Successful operation") ]
+    )
+    @RequestMapping(
+        method = [RequestMethod.POST],
+        value = ["/multipart-mixed"],
+        consumes = ["multipart/form-data"]
+    )
+    fun multipartMixed(@Parameter(description = "", required = true, schema = Schema(allowableValues = ["ALLOWED", "IN_PROGRESS", "REJECTED"])) @RequestParam(value = "status", required = true) status: MultipartMixedStatus ,@Parameter(description = "a file") @Valid @RequestPart("file", required = true) file: org.springframework.core.io.Resource,@Parameter(description = "") @RequestPart(value = "marker", required = false) marker: MultipartMixedRequestMarker? ): ResponseEntity<Unit> {
+        return ResponseEntity(HttpStatus.NOT_IMPLEMENTED)
+    }
+}
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/model/MultipartMixedRequestMarker.kt b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/model/MultipartMixedRequestMarker.kt
new file mode 100644
index 000000000000..1a8f989c9174
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/model/MultipartMixedRequestMarker.kt
@@ -0,0 +1,27 @@
+package org.openapitools.model
+
+import java.util.Objects
+import com.fasterxml.jackson.annotation.JsonProperty
+import javax.validation.constraints.DecimalMax
+import javax.validation.constraints.DecimalMin
+import javax.validation.constraints.Email
+import javax.validation.constraints.Max
+import javax.validation.constraints.Min
+import javax.validation.constraints.NotNull
+import javax.validation.constraints.Pattern
+import javax.validation.constraints.Size
+import javax.validation.Valid
+import io.swagger.v3.oas.annotations.media.Schema
+
+/**
+ * additional object
+ * @param name 
+ */
+data class MultipartMixedRequestMarker(
+
+    @Schema(example = "null", description = "")
+    @get:JsonProperty("name") val name: kotlin.String? = null
+) {
+
+}
+
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/model/MultipartMixedStatus.kt b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/model/MultipartMixedStatus.kt
new file mode 100644
index 000000000000..ed53fb8b4b48
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/kotlin/org/openapitools/model/MultipartMixedStatus.kt
@@ -0,0 +1,27 @@
+package org.openapitools.model
+
+import java.util.Objects
+import com.fasterxml.jackson.annotation.JsonValue
+import com.fasterxml.jackson.annotation.JsonProperty
+import javax.validation.constraints.DecimalMax
+import javax.validation.constraints.DecimalMin
+import javax.validation.constraints.Email
+import javax.validation.constraints.Max
+import javax.validation.constraints.Min
+import javax.validation.constraints.NotNull
+import javax.validation.constraints.Pattern
+import javax.validation.constraints.Size
+import javax.validation.Valid
+import io.swagger.v3.oas.annotations.media.Schema
+
+/**
+* additional field as Enum
+* Values: ALLOWED,IN_PROGRESS,REJECTED
+*/
+enum class MultipartMixedStatus(val value: kotlin.String) {
+
+    @JsonProperty("ALLOWED") ALLOWED("ALLOWED"),
+    @JsonProperty("IN_PROGRESS") IN_PROGRESS("IN_PROGRESS"),
+    @JsonProperty("REJECTED") REJECTED("REJECTED")
+}
+
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/resources/application.yaml b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/resources/application.yaml
new file mode 100644
index 000000000000..51bc6d3fb4a4
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/resources/application.yaml
@@ -0,0 +1,10 @@
+spring:
+  application:
+    name: multipartFileTest
+
+  jackson:
+    serialization:
+      WRITE_DATES_AS_TIMESTAMPS: false
+
+server:
+  port: 8080
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/resources/openapi.yaml b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/resources/openapi.yaml
new file mode 100644
index 000000000000..4511aa31f498
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/main/resources/openapi.yaml
@@ -0,0 +1,51 @@
+openapi: 3.0.1
+info:
+  title: MultipartFile test
+  version: 1.0.0
+servers:
+- url: /
+paths:
+  /multipart-mixed:
+    post:
+      description: Mixed MultipartFile test
+      operationId: multipartMixed
+      requestBody:
+        content:
+          multipart/form-data:
+            schema:
+              $ref: '#/components/schemas/multipartMixed_request'
+      responses:
+        "204":
+          description: Successful operation
+      tags:
+      - multipart
+components:
+  schemas:
+    MultipartMixedStatus:
+      description: additional field as Enum
+      enum:
+      - ALLOWED
+      - IN_PROGRESS
+      - REJECTED
+      example: REJECTED
+      type: string
+    multipartMixed_request_marker:
+      description: additional object
+      properties:
+        name:
+          type: string
+      type: object
+    multipartMixed_request:
+      properties:
+        status:
+          $ref: '#/components/schemas/MultipartMixedStatus'
+        marker:
+          $ref: '#/components/schemas/multipartMixed_request_marker'
+        file:
+          description: a file
+          format: binary
+          type: string
+      required:
+      - file
+      - status
+      type: object
diff --git a/samples/server/petstore/kotlin-springboot-multipart-request-model/src/test/kotlin/org/openapitools/api/MultipartMixedApiTest.kt b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/test/kotlin/org/openapitools/api/MultipartMixedApiTest.kt
new file mode 100644
index 000000000000..6330073d7439
--- /dev/null
+++ b/samples/server/petstore/kotlin-springboot-multipart-request-model/src/test/kotlin/org/openapitools/api/MultipartMixedApiTest.kt
@@ -0,0 +1,27 @@
+package org.openapitools.api
+
+import org.openapitools.model.MultipartMixedRequestMarker
+import org.openapitools.model.MultipartMixedStatus
+import org.junit.jupiter.api.Test
+import org.springframework.http.ResponseEntity
+
+class MultipartMixedApiTest {
+
+    private val api: MultipartMixedApiController = MultipartMixedApiController()
+
+    /**
+     * To test MultipartMixedApiController.multipartMixed
+     *
+     * @throws ApiException
+     *          if the Api call fails
+     */
+    @Test
+    fun multipartMixedTest() {
+        val status: MultipartMixedStatus = TODO()
+        val file: org.springframework.core.io.Resource = TODO()
+        val marker: MultipartMixedRequestMarker? = TODO()
+        val response: ResponseEntity<Unit> = api.multipartMixed(status, file, marker)
+
+        // TODO: test validations
+    }
+}