[BUG][Kotlin-client] Handling default values of parameters (#12255)

* Bugfix Kotlin-client: Handling default values of parameters * Adding object
2022-04-29 14:26:29 +00:00 · 2022-04-29 14:26:29 +00:00 · 8950a9a3c0
commit 8950a9a3c0
parent b6a8037f62
221 changed files with 12616 additions and 5807 deletions
--- a/.github/workflows/samples-kotlin-client.yaml
+++ b/.github/workflows/samples-kotlin-client.yaml
@ -40,6 +40,11 @@ jobs:
          - samples/client/petstore/kotlin-uppercase-enum
          - samples/client/petstore/kotlin-array-simple-string
          - samples/client/petstore/kotlin-bigdecimal-default
+          - samples/client/petstore/kotlin-default-values-jvm-okhttp3
+          - samples/client/petstore/kotlin-default-values-jvm-okhttp4
+          - samples/client/petstore/kotlin-default-values-jvm-retrofit2
+          - samples/client/petstore/kotlin-default-values-jvm-volley
+          - samples/client/petstore/kotlin-default-values-multiplatform
    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-java@v3
--- a/bin/configs/kotlin-default-values-jvm-okhttp3.yaml
+++ b/bin/configs/kotlin-default-values-jvm-okhttp3.yaml
@ -0,0 +1,8 @@
+generatorName: kotlin
+outputDir: samples/client/petstore/kotlin-default-values-jvm-okhttp3
+inputSpec: modules/openapi-generator/src/test/resources/3_0/issue_10865_default_values.yaml
+templateDir: modules/openapi-generator/src/main/resources/kotlin-client
+additionalProperties:
+  artifactId: kotlin-default-values-jvm-okhttp3
+  library: jvm-okhttp3
+  sortParamsByRequiredFlag: false
--- a/bin/configs/kotlin-default-values-jvm-okhttp4.yaml
+++ b/bin/configs/kotlin-default-values-jvm-okhttp4.yaml
@ -0,0 +1,8 @@
+generatorName: kotlin
+outputDir: samples/client/petstore/kotlin-default-values-jvm-okhttp4
+inputSpec: modules/openapi-generator/src/test/resources/3_0/issue_10865_default_values.yaml
+templateDir: modules/openapi-generator/src/main/resources/kotlin-client
+additionalProperties:
+  artifactId: kotlin-default-values-jvm-okhttp4
+  library: jvm-okhttp4
+  sortParamsByRequiredFlag: false
--- a/bin/configs/kotlin-default-values-jvm-retrofit2.yaml
+++ b/bin/configs/kotlin-default-values-jvm-retrofit2.yaml
@ -0,0 +1,8 @@
+generatorName: kotlin
+outputDir: samples/client/petstore/kotlin-default-values-jvm-retrofit2
+inputSpec: modules/openapi-generator/src/test/resources/3_0/issue_10865_default_values.yaml
+templateDir: modules/openapi-generator/src/main/resources/kotlin-client
+additionalProperties:
+  artifactId: kotlin-default-values-jvm-retrofit2
+  library: jvm-retrofit2
+  sortParamsByRequiredFlag: false
--- a/bin/configs/kotlin-default-values-jvm-volley.yaml
+++ b/bin/configs/kotlin-default-values-jvm-volley.yaml
@ -0,0 +1,10 @@
+generatorName: kotlin
+outputDir: samples/client/petstore/kotlin-default-values-jvm-volley
+inputSpec: modules/openapi-generator/src/test/resources/3_0/issue_10865_default_values.yaml
+templateDir: modules/openapi-generator/src/main/resources/kotlin-client
+additionalProperties:
+  artifactId: kotlin-default-values-jvm-volley
+  library: jvm-volley
+  sortParamsByRequiredFlag: false
+  serializationLibrary: gson
+  generateRoomModels: true
--- a/bin/configs/kotlin-default-values-multiplatform.yaml
+++ b/bin/configs/kotlin-default-values-multiplatform.yaml
@ -0,0 +1,8 @@
+generatorName: kotlin
+outputDir: samples/client/petstore/kotlin-default-values-multiplatform
+inputSpec: modules/openapi-generator/src/test/resources/3_0/issue_10865_default_values.yaml
+templateDir: modules/openapi-generator/src/main/resources/kotlin-client
+additionalProperties:
+  artifactId: kotlin-default-values-multiplatform
+  library: multiplatform
+  sortParamsByRequiredFlag: false
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-okhttp/api.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-okhttp/api.mustache
@ -115,22 +115,22 @@ import {{packageName}}.infrastructure.toMultiValue
    {{/isEnum}}
    {{/allParams}}
    /**
-    * {{summary}}
-    * {{notes}}
-    {{#allParams}}* @param {{{paramName}}} {{description}} {{^required}}(optional{{#defaultValue}}, default to {{{.}}}{{/defaultValue}}){{/required}}
-    {{/allParams}}* @return {{#returnType}}{{{returnType}}}{{#nullableReturnType}} or null{{/nullableReturnType}}{{/returnType}}{{^returnType}}void{{/returnType}}
-    * @throws IllegalStateException If the request is not correctly configured
-    * @throws IOException Rethrows the OkHttp execute method exception
-    * @throws UnsupportedOperationException If the API returns an informational or redirection response
-    * @throws ClientException If the API returns a client error response
-    * @throws ServerException If the API returns a server error response
-    */{{#returnType}}
+     * {{summary}}
+     * {{notes}}
+     {{#allParams}}* @param {{{paramName}}} {{description}}{{^required}} (optional{{#defaultValue}}, default to {{{.}}}{{/defaultValue}}){{/required}}{{#required}}{{#defaultValue}} (default to {{{.}}}){{/defaultValue}}{{/required}}
+     {{/allParams}}* @return {{#returnType}}{{{returnType}}}{{#nullableReturnType}} or null{{/nullableReturnType}}{{/returnType}}{{^returnType}}void{{/returnType}}
+     * @throws IllegalStateException If the request is not correctly configured
+     * @throws IOException Rethrows the OkHttp execute method exception
+     * @throws UnsupportedOperationException If the API returns an informational or redirection response
+     * @throws ClientException If the API returns a client error response
+     * @throws ServerException If the API returns a server error response
+     */{{#returnType}}
    @Suppress("UNCHECKED_CAST"){{/returnType}}
    @Throws(IllegalStateException::class, IOException::class, UnsupportedOperationException::class, ClientException::class, ServerException::class)
    {{#isDeprecated}}
    @Deprecated(message = "This operation is deprecated.")
    {{/isDeprecated}}
-    {{^doNotUseRxAndCoroutines}}{{#useCoroutines}}suspend {{/useCoroutines}}{{/doNotUseRxAndCoroutines}}fun {{operationId}}({{#allParams}}{{{paramName}}}: {{#isEnum}}{{#isContainer}}kotlin.collections.List<{{enumName}}_{{operationId}}>{{/isContainer}}{{^isContainer}}{{enumName}}_{{operationId}}{{/isContainer}}{{/isEnum}}{{^isEnum}}{{{dataType}}}{{/isEnum}}{{^required}}?{{/required}}{{^-last}}, {{/-last}}{{/allParams}}) : {{#returnType}}{{{returnType}}}{{#nullableReturnType}}?{{/nullableReturnType}}{{/returnType}}{{^returnType}}Unit{{/returnType}}{{^doNotUseRxAndCoroutines}}{{#useCoroutines}} = withContext(Dispatchers.IO){{/useCoroutines}}{{/doNotUseRxAndCoroutines}} {
+    {{^doNotUseRxAndCoroutines}}{{#useCoroutines}}suspend {{/useCoroutines}}{{/doNotUseRxAndCoroutines}}fun {{operationId}}({{#allParams}}{{{paramName}}}: {{#isEnum}}{{#isContainer}}kotlin.collections.List<{{enumName}}_{{operationId}}>{{/isContainer}}{{^isContainer}}{{enumName}}_{{operationId}}{{/isContainer}}{{/isEnum}}{{^isEnum}}{{{dataType}}}{{/isEnum}}{{#required}}{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{/required}}{{^required}}?{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{^defaultValue}} = null{{/defaultValue}}{{/required}}{{^-last}}, {{/-last}}{{/allParams}}) : {{#returnType}}{{{returnType}}}{{#nullableReturnType}}?{{/nullableReturnType}}{{/returnType}}{{^returnType}}Unit{{/returnType}}{{^doNotUseRxAndCoroutines}}{{#useCoroutines}} = withContext(Dispatchers.IO){{/useCoroutines}}{{/doNotUseRxAndCoroutines}} {
        {{#isDeprecated}}
        @Suppress("DEPRECATION")
        {{/isDeprecated}}
@ -152,13 +152,13 @@ import {{packageName}}.infrastructure.toMultiValue
    }

    /**
-    * {{summary}}
-    * {{notes}}
-    {{#allParams}}* @param {{{paramName}}} {{description}} {{^required}}(optional{{#defaultValue}}, default to {{{.}}}{{/defaultValue}}){{/required}}
-    {{/allParams}}* @return ApiResponse<{{#returnType}}{{{returnType}}}?{{/returnType}}{{^returnType}}Unit?{{/returnType}}>
-    * @throws IllegalStateException If the request is not correctly configured
-    * @throws IOException Rethrows the OkHttp execute method exception
-    */{{#returnType}}
+     * {{summary}}
+     * {{notes}}
+     {{#allParams}}* @param {{{paramName}}} {{description}}{{^required}} (optional{{#defaultValue}}, default to {{{.}}}{{/defaultValue}}){{/required}}{{#required}}{{#defaultValue}} (default to {{{.}}}){{/defaultValue}}{{/required}}
+     {{/allParams}}* @return ApiResponse<{{#returnType}}{{{returnType}}}?{{/returnType}}{{^returnType}}Unit?{{/returnType}}>
+     * @throws IllegalStateException If the request is not correctly configured
+     * @throws IOException Rethrows the OkHttp execute method exception
+     */{{#returnType}}
    @Suppress("UNCHECKED_CAST"){{/returnType}}
    @Throws(IllegalStateException::class, IOException::class)
    {{#isDeprecated}}
@ -176,11 +176,11 @@ import {{packageName}}.infrastructure.toMultiValue
    }

    /**
-    * To obtain the request config of the operation {{operationId}}
-    *
-    {{#allParams}}* @param {{{paramName}}} {{description}} {{^required}}(optional{{#defaultValue}}, default to {{{.}}}{{/defaultValue}}){{/required}}
-    {{/allParams}}* @return RequestConfig
-    */
+     * To obtain the request config of the operation {{operationId}}
+     *
+     {{#allParams}}* @param {{{paramName}}} {{description}}{{^required}} (optional{{#defaultValue}}, default to {{{.}}}{{/defaultValue}}){{/required}}{{#required}}{{#defaultValue}} (default to {{{.}}}){{/defaultValue}}{{/required}}
+     {{/allParams}}* @return RequestConfig
+     */
    {{#isDeprecated}}
    @Deprecated(message = "This operation is deprecated.")
    {{/isDeprecated}}
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/api.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/api.mustache
@ -62,7 +62,7 @@ interface {{classname}} {
     *  - {{code}}: {{{message}}}{{/responses}}
     *
    {{#allParams}}
-     * @param {{paramName}} {{description}} {{^required}}(optional{{#defaultValue}}, default to {{{.}}}{{/defaultValue}}){{/required}}
+     * @param {{{paramName}}} {{description}}{{^required}} (optional{{#defaultValue}}, default to {{{.}}}{{/defaultValue}}){{/required}}{{#required}}{{#defaultValue}} (default to {{{.}}}){{/defaultValue}}{{/required}}
    {{/allParams}}
     * @return {{^useCoroutines}}[Call]<{{/useCoroutines}}{{#isResponseFile}}[ResponseBody]{{/isResponseFile}}{{^isResponseFile}}{{#returnType}}[{{{.}}}]{{/returnType}}{{^returnType}}[Unit]{{/returnType}}{{/isResponseFile}}{{^useCoroutines}}>{{/useCoroutines}}
     */
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/formParams.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/formParams.mustache
@ -1 +1 @@
-{{#isFormParam}}{{^isFile}}{{#isMultipart}}@Part{{/isMultipart}}{{^isMultipart}}@Field{{/isMultipart}}("{{baseName}}") {{{paramName}}}: {{{dataType}}}{{#required}}{{#defaultValue}} = {{{.}}}{{/defaultValue}}{{/required}}{{^required}}?{{#defaultValue}} = {{{.}}}{{/defaultValue}}{{^defaultValue}} = null{{/defaultValue}}{{/required}}{{/isFile}}{{#isFile}}{{#isMultipart}}@Part{{/isMultipart}}{{^isMultipart}}@Field("{{baseName}}"){{/isMultipart}} {{{paramName}}}: MultipartBody.Part{{^required}}? = null{{/required}}{{/isFile}}{{/isFormParam}}
+{{#isFormParam}}{{^isFile}}{{#isMultipart}}@Part{{/isMultipart}}{{^isMultipart}}@Field{{/isMultipart}}("{{baseName}}") {{{paramName}}}: {{{dataType}}}{{#required}}{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{/required}}{{^required}}?{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{^defaultValue}} = null{{/defaultValue}}{{/required}}{{/isFile}}{{#isFile}}{{#isMultipart}}@Part{{/isMultipart}}{{^isMultipart}}@Field("{{baseName}}"){{/isMultipart}} {{{paramName}}}: MultipartBody.Part{{^required}}? = null{{/required}}{{/isFile}}{{/isFormParam}}
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/headerParams.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/headerParams.mustache
@ -1 +1 @@
-{{#isHeaderParam}}@Header("{{baseName}}") {{{paramName}}}: {{{dataType}}}{{#required}}{{#defaultValue}} = {{{.}}}{{/defaultValue}}{{/required}}{{^required}}?{{#defaultValue}} = {{{.}}}{{/defaultValue}}{{^defaultValue}} = null{{/defaultValue}}{{/required}}{{/isHeaderParam}}
+{{#isHeaderParam}}@Header("{{baseName}}") {{{paramName}}}: {{{dataType}}}{{#required}}{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{/required}}{{^required}}?{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{^defaultValue}} = null{{/defaultValue}}{{/required}}{{/isHeaderParam}}
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/pathParams.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/pathParams.mustache
@ -1 +1 @@
-{{#isPathParam}}@Path("{{baseName}}") {{{paramName}}}: {{{dataType}}}{{/isPathParam}}
+{{#isPathParam}}@Path("{{baseName}}") {{{paramName}}}: {{{dataType}}}{{#required}}{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{/required}}{{^required}}?{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{^defaultValue}} = null{{/defaultValue}}{{/required}}{{/isPathParam}}
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/queryParams.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/queryParams.mustache
@ -1 +1 @@
-{{#isQueryParam}}@Query("{{baseName}}") {{{paramName}}}: {{#collectionFormat}}{{#isCollectionFormatMulti}}{{{dataType}}}{{/isCollectionFormatMulti}}{{^isCollectionFormatMulti}}{{{collectionFormat.toUpperCase}}}Params{{/isCollectionFormatMulti}}{{/collectionFormat}}{{^collectionFormat}}{{{dataType}}}{{/collectionFormat}}{{^required}}? = null{{/required}}{{/isQueryParam}}
+{{#isQueryParam}}@Query("{{baseName}}") {{{paramName}}}: {{#collectionFormat}}{{#isCollectionFormatMulti}}{{{dataType}}}{{/isCollectionFormatMulti}}{{^isCollectionFormatMulti}}{{{collectionFormat.toUpperCase}}}Params{{/isCollectionFormatMulti}}{{/collectionFormat}}{{^collectionFormat}}{{{dataType}}}{{/collectionFormat}}{{#required}}{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{/required}}{{^required}}?{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{^defaultValue}} = null{{/defaultValue}}{{/required}}{{/isQueryParam}}
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-volley/api.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-volley/api.mustache
@ -37,11 +37,11 @@ class {{classname}} (

    {{#operation}}
    /**
-    * {{summary}}
-    * {{notes}}
-    {{#allParams}}   * @param {{paramName}} {{description}}
-    {{/allParams}}   * @return {{#returnType}}{{{returnType}}}{{/returnType}}{{^returnType}}void{{/returnType}}
-    */
+     * {{summary}}
+     * {{notes}}
+     {{#allParams}}* @param {{{paramName}}} {{description}}{{^required}} (optional{{#defaultValue}}, default to {{{.}}}{{/defaultValue}}){{/required}}{{#required}}{{#defaultValue}} (default to {{{.}}}){{/defaultValue}}{{/required}}
+     {{/allParams}}* @return {{#returnType}}{{{returnType}}}{{/returnType}}{{^returnType}}void{{/returnType}}
+     */
    {{#isDeprecated}}
    @Deprecated("This api was deprecated")
    {{/isDeprecated}}
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-volley/formParams.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-volley/formParams.mustache
@ -1 +1 @@
-{{#isFormParam}}{{{paramName}}}: {{{dataType}}}{{#required}}{{#defaultValue}} = {{{defaultValue}}}{{/defaultValue}}{{/required}}{{^required}}?{{#defaultValue}} = {{{defaultValue}}}{{/defaultValue}}{{^defaultValue}} = null{{/defaultValue}}{{/required}}{{/isFormParam}}
+{{#isFormParam}}{{{paramName}}}: {{{dataType}}}{{#required}}{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{/required}}{{^required}}?{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{^defaultValue}} = null{{/defaultValue}}{{/required}}{{/isFormParam}}
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-volley/headerParams.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-volley/headerParams.mustache
@ -1 +1 @@
-{{#isHeaderParam}}{{{paramName}}}: {{{dataType}}}{{#required}}{{#defaultValue}} = {{{defaultValue}}}{{/defaultValue}}{{/required}}{{^required}}?{{#defaultValue}} = {{{defaultValue}}}{{/defaultValue}}{{^defaultValue}} = null{{/defaultValue}}{{/required}}{{/isHeaderParam}}
+{{#isHeaderParam}}{{{paramName}}}: {{{dataType}}}{{#required}}{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{/required}}{{^required}}?{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{^defaultValue}} = null{{/defaultValue}}{{/required}}{{/isHeaderParam}}
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-volley/pathParams.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-volley/pathParams.mustache
@ -1 +1 @@
-{{#isPathParam}}{{{paramName}}}: {{{dataType}}}{{/isPathParam}}
+{{#isPathParam}}{{{paramName}}}: {{{dataType}}}{{#required}}{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{/required}}{{^required}}?{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{^defaultValue}} = null{{/defaultValue}}{{/required}}{{/isPathParam}}
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-volley/queryParams.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-volley/queryParams.mustache
@ -1 +1 @@
-{{#isQueryParam}}{{{paramName}}}: {{#collectionFormat}}{{#isCollectionFormatMulti}}{{{dataType}}}{{/isCollectionFormatMulti}}{{^isCollectionFormatMulti}}{{{collectionFormat.toUpperCase}}}Params{{/isCollectionFormatMulti}}{{/collectionFormat}}{{^collectionFormat}}{{{dataType}}}{{/collectionFormat}}{{^required}}? = null{{/required}}{{/isQueryParam}}
+{{#isQueryParam}}{{{paramName}}}: {{#collectionFormat}}{{#isCollectionFormatMulti}}{{{dataType}}}{{/isCollectionFormatMulti}}{{^isCollectionFormatMulti}}{{{collectionFormat.toUpperCase}}}Params{{/isCollectionFormatMulti}}{{/collectionFormat}}{{^collectionFormat}}{{{dataType}}}{{/collectionFormat}}{{#required}}{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{/required}}{{^required}}?{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{^defaultValue}} = null{{/defaultValue}}{{/required}}{{/isQueryParam}}
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/multiplatform/api.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/multiplatform/api.mustache
@ -27,13 +27,13 @@ import kotlinx.serialization.encoding.*
    /**
     * {{summary}}
     * {{notes}}
-    {{#allParams}} * @param {{{paramName}}} {{description}} {{^required}}(optional{{#defaultValue}}, default to {{{.}}}{{/defaultValue}}){{/required}}
+    {{#allParams}} * @param {{{paramName}}} {{description}}{{^required}} (optional{{#defaultValue}}, default to {{{.}}}{{/defaultValue}}){{/required}}{{#required}}{{#defaultValue}} (default to {{{.}}}){{/defaultValue}}{{/required}}
    {{/allParams}} * @return {{{returnType}}}{{^returnType}}void{{/returnType}}
     */
    {{#returnType}}
    @Suppress("UNCHECKED_CAST")
    {{/returnType}}
-    open suspend fun {{operationId}}({{#allParams}}{{{paramName}}}: {{{dataType}}}{{^required}}?{{/required}}{{^-last}}, {{/-last}}{{/allParams}}): HttpResponse<{{{returnType}}}{{^returnType}}Unit{{/returnType}}> {
+    open suspend fun {{operationId}}({{#allParams}}{{{paramName}}}: {{{dataType}}}{{#required}}{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{defaultValue}}}.toDouble(){{/isNumber}}{{/defaultValue}}{{/required}}{{^required}}?{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{defaultValue}}}.toDouble(){{/isNumber}}{{/defaultValue}}{{^defaultValue}} = null{{/defaultValue}}{{/required}}{{^-last}}, {{/-last}}{{/allParams}}): HttpResponse<{{{returnType}}}{{^returnType}}Unit{{/returnType}}> {

        val localVariableAuthNames = listOf<String>({{#authMethods}}"{{name}}"{{^-last}}, {{/-last}}{{/authMethods}})

--- a/modules/openapi-generator/src/test/resources/3_0/issue_10865_default_values.yaml
+++ b/modules/openapi-generator/src/test/resources/3_0/issue_10865_default_values.yaml
@ -0,0 +1,171 @@
+swagger: '2.0'
+info:
+  version: 1.0.0
+  title: Demo
+paths:
+  '/test':
+    post:
+      summary: "Tests default values"
+      description: "Tests default values of different parameters"
+      operationId: "test"
+      parameters:
+        - name: pi0
+          in: path
+          required: true
+          type: integer
+          default: 10
+        - name: pi1
+          in: path
+          required: true
+          type: integer
+
+        - name: pn0
+          in: path
+          required: true
+          type: number
+          default: 10
+        - name: pn1
+          in: path
+          required: true
+          type: number
+
+
+        - name: qi0
+          in: query
+          required: false
+          type: integer
+          default: 10
+        - name: qi1
+          in: query
+          required: true
+          type: integer
+          default: 71
+        - name: qi2
+          in: query
+          required: false
+          type: integer
+        - name: qi3
+          in: query
+          required: true
+          type: integer
+
+        - name: qn0
+          in: query
+          required: false
+          type: number
+          default: 10
+        - name: qn1
+          in: query
+          required: true
+          type: number
+          default: 71
+        - name: qn2
+          in: query
+          required: false
+          type: number
+        - name: qn3
+          in: query
+          required: true
+          type: number
+
+
+        - name: hi0
+          in: header
+          required: false
+          type: integer
+          default: 10
+        - name: hi1
+          in: header
+          required: true
+          type: integer
+          default: 71
+        - name: hi2
+          in: header
+          required: false
+          type: integer
+        - name: hi3
+          in: header
+          required: true
+          type: integer
+
+        - name: hn0
+          in: header
+          required: false
+          type: number
+          default: 10
+        - name: hn1
+          in: header
+          required: true
+          type: number
+          default: 71
+        - name: hn2
+          in: header
+          required: false
+          type: number
+        - name: hn3
+          in: header
+          required: true
+          type: number
+
+
+        - name: fi0
+          in: formData
+          required: false
+          type: integer
+          default: 10
+        - name: fi1
+          in: formData
+          required: true
+          type: integer
+          default: 71
+        - name: fi2
+          in: formData
+          required: false
+          type: integer
+        - name: fi3
+          in: formData
+          required: true
+          type: integer
+
+        - name: fn0
+          in: formData
+          required: false
+          type: number
+          default: 10
+        - name: fn1
+          in: formData
+          required: true
+          type: number
+          default: 71
+        - name: fn2
+          in: formData
+          required: false
+          type: number
+        - name: fn3
+          in: formData
+          required: true
+          type: number
+
+      responses:
+        "200":
+          description: "Success"
+
+definitions:
+  Apa:
+    type: object
+    required:
+      - i0
+      - n0
+    properties:
+      i0:
+        type: integer
+        default: 10
+      i1:
+        type: integer
+        default: 20
+      n0:
+        type: number
+        default: 71
+      n1:
+        type: number
+        default: 68
--- a/samples/client/petstore/kotlin-array-simple-string/src/main/kotlin/org/openapitools/client/apis/DefaultApi.kt
+++ b/samples/client/petstore/kotlin-array-simple-string/src/main/kotlin/org/openapitools/client/apis/DefaultApi.kt
@ -48,16 +48,16 @@ class DefaultApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath
    }

    /**
-    * 
-    * 
-    * @param ids  
-    * @return void
-    * @throws IllegalStateException If the request is not correctly configured
-    * @throws IOException Rethrows the OkHttp execute method exception
-    * @throws UnsupportedOperationException If the API returns an informational or redirection response
-    * @throws ClientException If the API returns a client error response
-    * @throws ServerException If the API returns a server error response
-    */
+     * 
+     * 
+     * @param ids 
+     * @return void
+     * @throws IllegalStateException If the request is not correctly configured
+     * @throws IOException Rethrows the OkHttp execute method exception
+     * @throws UnsupportedOperationException If the API returns an informational or redirection response
+     * @throws ClientException If the API returns a client error response
+     * @throws ServerException If the API returns a server error response
+     */
    @Throws(IllegalStateException::class, IOException::class, UnsupportedOperationException::class, ClientException::class, ServerException::class)
    fun idsGet(ids: kotlin.collections.List<kotlin.String>) : Unit {
        val localVarResponse = idsGetWithHttpInfo(ids = ids)
@ -78,13 +78,13 @@ class DefaultApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath
    }

    /**
-    * 
-    * 
-    * @param ids  
-    * @return ApiResponse<Unit?>
-    * @throws IllegalStateException If the request is not correctly configured
-    * @throws IOException Rethrows the OkHttp execute method exception
-    */
+     * 
+     * 
+     * @param ids 
+     * @return ApiResponse<Unit?>
+     * @throws IllegalStateException If the request is not correctly configured
+     * @throws IOException Rethrows the OkHttp execute method exception
+     */
    @Throws(IllegalStateException::class, IOException::class)
    fun idsGetWithHttpInfo(ids: kotlin.collections.List<kotlin.String>) : ApiResponse<Unit?> {
        val localVariableConfig = idsGetRequestConfig(ids = ids)
@ -95,11 +95,11 @@ class DefaultApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath
    }

    /**
-    * To obtain the request config of the operation idsGet
-    *
-    * @param ids  
-    * @return RequestConfig
-    */
+     * To obtain the request config of the operation idsGet
+     *
+     * @param ids 
+     * @return RequestConfig
+     */
    fun idsGetRequestConfig(ids: kotlin.collections.List<kotlin.String>) : RequestConfig<Unit> {
        val localVariableBody = null
        val localVariableQuery: MultiValueMap = mutableMapOf()
--- a/samples/client/petstore/kotlin-bigdecimal-default-okhttp4/src/main/kotlin/org/openapitools/client/apis/DefaultApi.kt
+++ b/samples/client/petstore/kotlin-bigdecimal-default-okhttp4/src/main/kotlin/org/openapitools/client/apis/DefaultApi.kt
@ -49,16 +49,16 @@ class DefaultApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath
    }

    /**
-    * 
-    * 
-    * @param apa  
-    * @return void
-    * @throws IllegalStateException If the request is not correctly configured
-    * @throws IOException Rethrows the OkHttp execute method exception
-    * @throws UnsupportedOperationException If the API returns an informational or redirection response
-    * @throws ClientException If the API returns a client error response
-    * @throws ServerException If the API returns a server error response
-    */
+     * 
+     * 
+     * @param apa 
+     * @return void
+     * @throws IllegalStateException If the request is not correctly configured
+     * @throws IOException Rethrows the OkHttp execute method exception
+     * @throws UnsupportedOperationException If the API returns an informational or redirection response
+     * @throws ClientException If the API returns a client error response
+     * @throws ServerException If the API returns a server error response
+     */
    @Throws(IllegalStateException::class, IOException::class, UnsupportedOperationException::class, ClientException::class, ServerException::class)
    fun testPost(apa: Apa) : Unit {
        val localVarResponse = testPostWithHttpInfo(apa = apa)
@ -79,13 +79,13 @@ class DefaultApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath
    }

    /**
-    * 
-    * 
-    * @param apa  
-    * @return ApiResponse<Unit?>
-    * @throws IllegalStateException If the request is not correctly configured
-    * @throws IOException Rethrows the OkHttp execute method exception
-    */
+     * 
+     * 
+     * @param apa 
+     * @return ApiResponse<Unit?>
+     * @throws IllegalStateException If the request is not correctly configured
+     * @throws IOException Rethrows the OkHttp execute method exception
+     */
    @Throws(IllegalStateException::class, IOException::class)
    fun testPostWithHttpInfo(apa: Apa) : ApiResponse<Unit?> {
        val localVariableConfig = testPostRequestConfig(apa = apa)
@ -96,11 +96,11 @@ class DefaultApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath
    }

    /**
-    * To obtain the request config of the operation testPost
-    *
-    * @param apa  
-    * @return RequestConfig
-    */
+     * To obtain the request config of the operation testPost
+     *
+     * @param apa 
+     * @return RequestConfig
+     */
    fun testPostRequestConfig(apa: Apa) : RequestConfig<Apa> {
        val localVariableBody = apa
        val localVariableQuery: MultiValueMap = mutableMapOf()
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/.openapi-generator-ignore
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/.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
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/.openapi-generator/FILES
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/.openapi-generator/FILES
@ -0,0 +1,28 @@
+README.md
+build.gradle
+docs/Apa.md
+docs/DefaultApi.md
+gradle/wrapper/gradle-wrapper.jar
+gradle/wrapper/gradle-wrapper.properties
+gradlew
+gradlew.bat
+settings.gradle
+src/main/kotlin/org/openapitools/client/apis/DefaultApi.kt
+src/main/kotlin/org/openapitools/client/infrastructure/ApiAbstractions.kt
+src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+src/main/kotlin/org/openapitools/client/infrastructure/ApiResponse.kt
+src/main/kotlin/org/openapitools/client/infrastructure/BigDecimalAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/BigIntegerAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/ByteArrayAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/Errors.kt
+src/main/kotlin/org/openapitools/client/infrastructure/LocalDateAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/LocalDateTimeAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/OffsetDateTimeAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/PartConfig.kt
+src/main/kotlin/org/openapitools/client/infrastructure/RequestConfig.kt
+src/main/kotlin/org/openapitools/client/infrastructure/RequestMethod.kt
+src/main/kotlin/org/openapitools/client/infrastructure/ResponseExtensions.kt
+src/main/kotlin/org/openapitools/client/infrastructure/Serializer.kt
+src/main/kotlin/org/openapitools/client/infrastructure/URIAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/UUIDAdapter.kt
+src/main/kotlin/org/openapitools/client/models/Apa.kt
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/.openapi-generator/VERSION
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/.openapi-generator/VERSION
@ -0,0 +1 @@
+6.0.0-SNAPSHOT
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/README.md
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/README.md
@ -0,0 +1,50 @@
+# org.openapitools.client - Kotlin client library for Demo
+
+## Requires
+
+* Kotlin 1.4.30
+* Gradle 6.8.3
+
+## Build
+
+First, create the gradle wrapper script:
+
+```
+gradle wrapper
+```
+
+Then, run:
+
+```
+./gradlew check assemble
+```
+
+This runs all tests and packages the library.
+
+## Features/Implementation Notes
+
+* Supports JSON inputs/outputs, File inputs, and Form inputs.
+* Supports collection formats for query parameters: csv, tsv, ssv, pipes.
+* Some Kotlin and Java types are fully qualified to avoid conflicts with types defined in OpenAPI definitions.
+* Implementation of ApiClient is intended to reduce method counts, specifically to benefit Android targets.
+
+<a name="documentation-for-api-endpoints"></a>
+## Documentation for API Endpoints
+
+All URIs are relative to *http://localhost*
+
+Class | Method | HTTP request | Description
+------------ | ------------- | ------------- | -------------
+*DefaultApi* | [**test**](docs/DefaultApi.md#test) | **POST** /test | Tests default values
+
+
+<a name="documentation-for-models"></a>
+## Documentation for Models
+
+ - [org.openapitools.client.models.Apa](docs/Apa.md)
+
+
+<a name="documentation-for-authorization"></a>
+## Documentation for Authorization
+
+All endpoints do not require authorization.
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/build.gradle
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/build.gradle
@ -0,0 +1,37 @@
+group 'org.openapitools'
+version '1.0.0'
+
+wrapper {
+    gradleVersion = '6.8.3'
+    distributionUrl = "https://services.gradle.org/distributions/gradle-$gradleVersion-all.zip"
+}
+
+buildscript {
+    ext.kotlin_version = '1.5.10'
+
+    repositories {
+        maven { url "https://repo1.maven.org/maven2" }
+    }
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+apply plugin: 'kotlin'
+
+repositories {
+    maven { url "https://repo1.maven.org/maven2" }
+}
+
+test {
+    useJUnitPlatform()
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+    implementation "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
+    implementation "com.squareup.moshi:moshi-kotlin:1.12.0"
+    implementation "com.squareup.moshi:moshi-adapters:1.12.0"
+    implementation "com.squareup.okhttp3:okhttp:3.12.13"
+    testImplementation "io.kotlintest:kotlintest-runner-junit5:3.4.2"
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/docs/Apa.md
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/docs/Apa.md
@ -0,0 +1,13 @@
+
+# Apa
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**i0** | **kotlin.Int** |  | 
+**n0** | [**java.math.BigDecimal**](java.math.BigDecimal.md) |  | 
+**i1** | **kotlin.Int** |  |  [optional]
+**n1** | [**java.math.BigDecimal**](java.math.BigDecimal.md) |  |  [optional]
+
+
+
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/docs/DefaultApi.md
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/docs/DefaultApi.md
@ -0,0 +1,109 @@
+# DefaultApi
+
+All URIs are relative to *http://localhost*
+
+Method | HTTP request | Description
+------------- | ------------- | -------------
+[**test**](DefaultApi.md#test) | **POST** /test | Tests default values
+
+
+<a name="test"></a>
+# **test**
+> test(pi0, pi1, pn0, pn1, qi0, qi1, qi2, qi3, qn0, qn1, qn2, qn3, hi0, hi1, hi2, hi3, hn0, hn1, hn2, hn3, fi0, fi1, fi2, fi3, fn0, fn1, fn2, fn3)
+
+Tests default values
+
+Tests default values of different parameters
+
+### Example
+```kotlin
+// Import classes:
+//import org.openapitools.client.infrastructure.*
+//import org.openapitools.client.models.*
+
+val apiInstance = DefaultApi()
+val pi0 : kotlin.Int = 56 // kotlin.Int | 
+val pi1 : kotlin.Int = 56 // kotlin.Int | 
+val pn0 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val pn1 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val qi0 : kotlin.Int = 56 // kotlin.Int | 
+val qi1 : kotlin.Int = 56 // kotlin.Int | 
+val qi2 : kotlin.Int = 56 // kotlin.Int | 
+val qi3 : kotlin.Int = 56 // kotlin.Int | 
+val qn0 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val qn1 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val qn2 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val qn3 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val hi0 : kotlin.Int = 56 // kotlin.Int | 
+val hi1 : kotlin.Int = 56 // kotlin.Int | 
+val hi2 : kotlin.Int = 56 // kotlin.Int | 
+val hi3 : kotlin.Int = 56 // kotlin.Int | 
+val hn0 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val hn1 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val hn2 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val hn3 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val fi0 : kotlin.Int = 56 // kotlin.Int | 
+val fi1 : kotlin.Int = 56 // kotlin.Int | 
+val fi2 : kotlin.Int = 56 // kotlin.Int | 
+val fi3 : kotlin.Int = 56 // kotlin.Int | 
+val fn0 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val fn1 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val fn2 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val fn3 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+try {
+    apiInstance.test(pi0, pi1, pn0, pn1, qi0, qi1, qi2, qi3, qn0, qn1, qn2, qn3, hi0, hi1, hi2, hi3, hn0, hn1, hn2, hn3, fi0, fi1, fi2, fi3, fn0, fn1, fn2, fn3)
+} catch (e: ClientException) {
+    println("4xx response calling DefaultApi#test")
+    e.printStackTrace()
+} catch (e: ServerException) {
+    println("5xx response calling DefaultApi#test")
+    e.printStackTrace()
+}
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **pi0** | **kotlin.Int**|  | [default to 10]
+ **pi1** | **kotlin.Int**|  |
+ **pn0** | **java.math.BigDecimal**|  | [default to 10.0]
+ **pn1** | **java.math.BigDecimal**|  |
+ **qi0** | **kotlin.Int**|  | [optional] [default to 10]
+ **qi1** | **kotlin.Int**|  | [default to 71]
+ **qi2** | **kotlin.Int**|  | [optional]
+ **qi3** | **kotlin.Int**|  |
+ **qn0** | **java.math.BigDecimal**|  | [optional] [default to 10.0]
+ **qn1** | **java.math.BigDecimal**|  | [default to 71.0]
+ **qn2** | **java.math.BigDecimal**|  | [optional]
+ **qn3** | **java.math.BigDecimal**|  |
+ **hi0** | **kotlin.Int**|  | [optional] [default to 10]
+ **hi1** | **kotlin.Int**|  | [default to 71]
+ **hi2** | **kotlin.Int**|  | [optional]
+ **hi3** | **kotlin.Int**|  |
+ **hn0** | **java.math.BigDecimal**|  | [optional] [default to 10.0]
+ **hn1** | **java.math.BigDecimal**|  | [default to 71.0]
+ **hn2** | **java.math.BigDecimal**|  | [optional]
+ **hn3** | **java.math.BigDecimal**|  |
+ **fi0** | **kotlin.Int**|  | [optional] [default to 10]
+ **fi1** | **kotlin.Int**|  | [default to 71]
+ **fi2** | **kotlin.Int**|  | [optional]
+ **fi3** | **kotlin.Int**|  |
+ **fn0** | **java.math.BigDecimal**|  | [optional] [default to 10.0]
+ **fn1** | **java.math.BigDecimal**|  | [default to 71.0]
+ **fn2** | **java.math.BigDecimal**|  | [optional]
+ **fn3** | **java.math.BigDecimal**|  |
+
+### Return type
+
+null (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: multipart/form-data
+ - **Accept**: Not defined
+
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/gradle/wrapper/gradle-wrapper.jar
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/gradle/wrapper/gradle-wrapper.jar
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/gradle/wrapper/gradle-wrapper.properties
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/gradle/wrapper/gradle-wrapper.properties
@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.3-all.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/gradlew
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/gradlew
@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/gradlew.bat
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/gradlew.bat
@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/settings.gradle
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/settings.gradle
@ -0,0 +1,2 @@
+
+rootProject.name = 'kotlin-default-values-jvm-okhttp3'
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/apis/DefaultApi.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/apis/DefaultApi.kt
@ -0,0 +1,232 @@
+/**
+ * Demo
+ *
+ * No description provided (generated by Openapi Generator https://github.com/openapitools/openapi-generator)
+ *
+ * The version of the OpenAPI document: 1.0.0
+ * 
+ *
+ * Please note:
+ * This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * Do not edit this file manually.
+ */
+
+@file:Suppress(
+    "ArrayInDataClass",
+    "EnumEntryName",
+    "RemoveRedundantQualifierName",
+    "UnusedImport"
+)
+
+package org.openapitools.client.apis
+
+import java.io.IOException
+
+
+import com.squareup.moshi.Json
+
+import org.openapitools.client.infrastructure.ApiClient
+import org.openapitools.client.infrastructure.ApiResponse
+import org.openapitools.client.infrastructure.ClientException
+import org.openapitools.client.infrastructure.ClientError
+import org.openapitools.client.infrastructure.ServerException
+import org.openapitools.client.infrastructure.ServerError
+import org.openapitools.client.infrastructure.MultiValueMap
+import org.openapitools.client.infrastructure.PartConfig
+import org.openapitools.client.infrastructure.RequestConfig
+import org.openapitools.client.infrastructure.RequestMethod
+import org.openapitools.client.infrastructure.ResponseType
+import org.openapitools.client.infrastructure.Success
+import org.openapitools.client.infrastructure.toMultiValue
+
+class DefaultApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty(ApiClient.baseUrlKey, "http://localhost")
+        }
+    }
+
+    /**
+     * Tests default values
+     * Tests default values of different parameters
+     * @param pi0  (default to 10)
+     * @param pi1 
+     * @param pn0  (default to 10.0)
+     * @param pn1 
+     * @param qi0  (optional, default to 10)
+     * @param qi1  (default to 71)
+     * @param qi2  (optional)
+     * @param qi3 
+     * @param qn0  (optional, default to 10.0)
+     * @param qn1  (default to 71.0)
+     * @param qn2  (optional)
+     * @param qn3 
+     * @param hi0  (optional, default to 10)
+     * @param hi1  (default to 71)
+     * @param hi2  (optional)
+     * @param hi3 
+     * @param hn0  (optional, default to 10.0)
+     * @param hn1  (default to 71.0)
+     * @param hn2  (optional)
+     * @param hn3 
+     * @param fi0  (optional, default to 10)
+     * @param fi1  (default to 71)
+     * @param fi2  (optional)
+     * @param fi3 
+     * @param fn0  (optional, default to 10.0)
+     * @param fn1  (default to 71.0)
+     * @param fn2  (optional)
+     * @param fn3 
+     * @return void
+     * @throws IllegalStateException If the request is not correctly configured
+     * @throws IOException Rethrows the OkHttp execute method exception
+     * @throws UnsupportedOperationException If the API returns an informational or redirection response
+     * @throws ClientException If the API returns a client error response
+     * @throws ServerException If the API returns a server error response
+     */
+    @Throws(IllegalStateException::class, IOException::class, UnsupportedOperationException::class, ClientException::class, ServerException::class)
+    fun test(pi0: kotlin.Int = 10, pi1: kotlin.Int, pn0: java.math.BigDecimal = java.math.BigDecimal("10.0"), pn1: java.math.BigDecimal, qi0: kotlin.Int? = 10, qi1: kotlin.Int = 71, qi2: kotlin.Int? = null, qi3: kotlin.Int, qn0: java.math.BigDecimal? = java.math.BigDecimal("10.0"), qn1: java.math.BigDecimal = java.math.BigDecimal("71.0"), qn2: java.math.BigDecimal? = null, qn3: java.math.BigDecimal, hi0: kotlin.Int? = 10, hi1: kotlin.Int = 71, hi2: kotlin.Int? = null, hi3: kotlin.Int, hn0: java.math.BigDecimal? = java.math.BigDecimal("10.0"), hn1: java.math.BigDecimal = java.math.BigDecimal("71.0"), hn2: java.math.BigDecimal? = null, hn3: java.math.BigDecimal, fi0: kotlin.Int? = 10, fi1: kotlin.Int = 71, fi2: kotlin.Int? = null, fi3: kotlin.Int, fn0: java.math.BigDecimal? = java.math.BigDecimal("10.0"), fn1: java.math.BigDecimal = java.math.BigDecimal("71.0"), fn2: java.math.BigDecimal? = null, fn3: java.math.BigDecimal) : Unit {
+        val localVarResponse = testWithHttpInfo(pi0 = pi0, pi1 = pi1, pn0 = pn0, pn1 = pn1, qi0 = qi0, qi1 = qi1, qi2 = qi2, qi3 = qi3, qn0 = qn0, qn1 = qn1, qn2 = qn2, qn3 = qn3, hi0 = hi0, hi1 = hi1, hi2 = hi2, hi3 = hi3, hn0 = hn0, hn1 = hn1, hn2 = hn2, hn3 = hn3, fi0 = fi0, fi1 = fi1, fi2 = fi2, fi3 = fi3, fn0 = fn0, fn1 = fn1, fn2 = fn2, fn3 = fn3)
+
+        return when (localVarResponse.responseType) {
+            ResponseType.Success -> Unit
+            ResponseType.Informational -> throw UnsupportedOperationException("Client does not support Informational responses.")
+            ResponseType.Redirection -> throw UnsupportedOperationException("Client does not support Redirection responses.")
+            ResponseType.ClientError -> {
+                val localVarError = localVarResponse as ClientError<*>
+                throw ClientException("Client error : ${localVarError.statusCode} ${localVarError.message.orEmpty()}", localVarError.statusCode, localVarResponse)
+            }
+            ResponseType.ServerError -> {
+                val localVarError = localVarResponse as ServerError<*>
+                throw ServerException("Server error : ${localVarError.statusCode} ${localVarError.message.orEmpty()}", localVarError.statusCode, localVarResponse)
+            }
+        }
+    }
+
+    /**
+     * Tests default values
+     * Tests default values of different parameters
+     * @param pi0  (default to 10)
+     * @param pi1 
+     * @param pn0  (default to 10.0)
+     * @param pn1 
+     * @param qi0  (optional, default to 10)
+     * @param qi1  (default to 71)
+     * @param qi2  (optional)
+     * @param qi3 
+     * @param qn0  (optional, default to 10.0)
+     * @param qn1  (default to 71.0)
+     * @param qn2  (optional)
+     * @param qn3 
+     * @param hi0  (optional, default to 10)
+     * @param hi1  (default to 71)
+     * @param hi2  (optional)
+     * @param hi3 
+     * @param hn0  (optional, default to 10.0)
+     * @param hn1  (default to 71.0)
+     * @param hn2  (optional)
+     * @param hn3 
+     * @param fi0  (optional, default to 10)
+     * @param fi1  (default to 71)
+     * @param fi2  (optional)
+     * @param fi3 
+     * @param fn0  (optional, default to 10.0)
+     * @param fn1  (default to 71.0)
+     * @param fn2  (optional)
+     * @param fn3 
+     * @return ApiResponse<Unit?>
+     * @throws IllegalStateException If the request is not correctly configured
+     * @throws IOException Rethrows the OkHttp execute method exception
+     */
+    @Throws(IllegalStateException::class, IOException::class)
+    fun testWithHttpInfo(pi0: kotlin.Int, pi1: kotlin.Int, pn0: java.math.BigDecimal, pn1: java.math.BigDecimal, qi0: kotlin.Int?, qi1: kotlin.Int, qi2: kotlin.Int?, qi3: kotlin.Int, qn0: java.math.BigDecimal?, qn1: java.math.BigDecimal, qn2: java.math.BigDecimal?, qn3: java.math.BigDecimal, hi0: kotlin.Int?, hi1: kotlin.Int, hi2: kotlin.Int?, hi3: kotlin.Int, hn0: java.math.BigDecimal?, hn1: java.math.BigDecimal, hn2: java.math.BigDecimal?, hn3: java.math.BigDecimal, fi0: kotlin.Int?, fi1: kotlin.Int, fi2: kotlin.Int?, fi3: kotlin.Int, fn0: java.math.BigDecimal?, fn1: java.math.BigDecimal, fn2: java.math.BigDecimal?, fn3: java.math.BigDecimal) : ApiResponse<Unit?> {
+        val localVariableConfig = testRequestConfig(pi0 = pi0, pi1 = pi1, pn0 = pn0, pn1 = pn1, qi0 = qi0, qi1 = qi1, qi2 = qi2, qi3 = qi3, qn0 = qn0, qn1 = qn1, qn2 = qn2, qn3 = qn3, hi0 = hi0, hi1 = hi1, hi2 = hi2, hi3 = hi3, hn0 = hn0, hn1 = hn1, hn2 = hn2, hn3 = hn3, fi0 = fi0, fi1 = fi1, fi2 = fi2, fi3 = fi3, fn0 = fn0, fn1 = fn1, fn2 = fn2, fn3 = fn3)
+
+        return request<Map<String, PartConfig<*>>, Unit>(
+            localVariableConfig
+        )
+    }
+
+    /**
+     * To obtain the request config of the operation test
+     *
+     * @param pi0  (default to 10)
+     * @param pi1 
+     * @param pn0  (default to 10.0)
+     * @param pn1 
+     * @param qi0  (optional, default to 10)
+     * @param qi1  (default to 71)
+     * @param qi2  (optional)
+     * @param qi3 
+     * @param qn0  (optional, default to 10.0)
+     * @param qn1  (default to 71.0)
+     * @param qn2  (optional)
+     * @param qn3 
+     * @param hi0  (optional, default to 10)
+     * @param hi1  (default to 71)
+     * @param hi2  (optional)
+     * @param hi3 
+     * @param hn0  (optional, default to 10.0)
+     * @param hn1  (default to 71.0)
+     * @param hn2  (optional)
+     * @param hn3 
+     * @param fi0  (optional, default to 10)
+     * @param fi1  (default to 71)
+     * @param fi2  (optional)
+     * @param fi3 
+     * @param fn0  (optional, default to 10.0)
+     * @param fn1  (default to 71.0)
+     * @param fn2  (optional)
+     * @param fn3 
+     * @return RequestConfig
+     */
+    fun testRequestConfig(pi0: kotlin.Int, pi1: kotlin.Int, pn0: java.math.BigDecimal, pn1: java.math.BigDecimal, qi0: kotlin.Int?, qi1: kotlin.Int, qi2: kotlin.Int?, qi3: kotlin.Int, qn0: java.math.BigDecimal?, qn1: java.math.BigDecimal, qn2: java.math.BigDecimal?, qn3: java.math.BigDecimal, hi0: kotlin.Int?, hi1: kotlin.Int, hi2: kotlin.Int?, hi3: kotlin.Int, hn0: java.math.BigDecimal?, hn1: java.math.BigDecimal, hn2: java.math.BigDecimal?, hn3: java.math.BigDecimal, fi0: kotlin.Int?, fi1: kotlin.Int, fi2: kotlin.Int?, fi3: kotlin.Int, fn0: java.math.BigDecimal?, fn1: java.math.BigDecimal, fn2: java.math.BigDecimal?, fn3: java.math.BigDecimal) : RequestConfig<Map<String, PartConfig<*>>> {
+        val localVariableBody = mapOf(
+            "fi0" to PartConfig(body = fi0, headers = mutableMapOf()),
+            "fi1" to PartConfig(body = fi1, headers = mutableMapOf()),
+            "fi2" to PartConfig(body = fi2, headers = mutableMapOf()),
+            "fi3" to PartConfig(body = fi3, headers = mutableMapOf()),
+            "fn0" to PartConfig(body = fn0, headers = mutableMapOf()),
+            "fn1" to PartConfig(body = fn1, headers = mutableMapOf()),
+            "fn2" to PartConfig(body = fn2, headers = mutableMapOf()),
+            "fn3" to PartConfig(body = fn3, headers = mutableMapOf()),)
+        val localVariableQuery: MultiValueMap = mutableMapOf<kotlin.String, kotlin.collections.List<kotlin.String>>()
+            .apply {
+                if (qi0 != null) {
+                    put("qi0", listOf(qi0.toString()))
+                }
+                put("qi1", listOf(qi1.toString()))
+                if (qi2 != null) {
+                    put("qi2", listOf(qi2.toString()))
+                }
+                put("qi3", listOf(qi3.toString()))
+                if (qn0 != null) {
+                    put("qn0", listOf(qn0.toString()))
+                }
+                put("qn1", listOf(qn1.toString()))
+                if (qn2 != null) {
+                    put("qn2", listOf(qn2.toString()))
+                }
+                put("qn3", listOf(qn3.toString()))
+            }
+        val localVariableHeaders: MutableMap<String, String> = mutableMapOf("Content-Type" to "multipart/form-data")
+        hi0?.apply { localVariableHeaders["hi0"] = this.toString() }
+        hi1.apply { localVariableHeaders["hi1"] = this.toString() }
+        hi2?.apply { localVariableHeaders["hi2"] = this.toString() }
+        hi3.apply { localVariableHeaders["hi3"] = this.toString() }
+        hn0?.apply { localVariableHeaders["hn0"] = this.toString() }
+        hn1.apply { localVariableHeaders["hn1"] = this.toString() }
+        hn2?.apply { localVariableHeaders["hn2"] = this.toString() }
+        hn3.apply { localVariableHeaders["hn3"] = this.toString() }
+        
+        return RequestConfig(
+            method = RequestMethod.POST,
+            path = "/test".replace("{"+"pi0"+"}", "$pi0").replace("{"+"pi1"+"}", "$pi1").replace("{"+"pn0"+"}", "$pn0").replace("{"+"pn1"+"}", "$pn1"),
+            query = localVariableQuery,
+            headers = localVariableHeaders,
+            body = localVariableBody
+        )
+    }
+
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiAbstractions.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiAbstractions.kt
@ -0,0 +1,23 @@
+package org.openapitools.client.infrastructure
+
+typealias MultiValueMap = MutableMap<String,List<String>>
+
+fun collectionDelimiter(collectionFormat: String) = when(collectionFormat) {
+    "csv" -> ","
+    "tsv" -> "\t"
+    "pipe" -> "|"
+    "space" -> " "
+    else -> ""
+}
+
+val defaultMultiValueConverter: (item: Any?) -> String = { item -> "$item" }
+
+fun <T : Any?> toMultiValue(items: Array<T>, collectionFormat: String, map: (item: T) -> String = defaultMultiValueConverter)
+        = toMultiValue(items.asIterable(), collectionFormat, map)
+
+fun <T : Any?> toMultiValue(items: Iterable<T>, collectionFormat: String, map: (item: T) -> String = defaultMultiValueConverter): List<String> {
+    return when(collectionFormat) {
+        "multi" -> items.map(map)
+        else -> listOf(items.joinToString(separator = collectionDelimiter(collectionFormat), transform = map))
+    }
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@ -0,0 +1,236 @@
+package org.openapitools.client.infrastructure
+
+import okhttp3.OkHttpClient
+import okhttp3.RequestBody
+import okhttp3.MediaType
+import okhttp3.FormBody
+import okhttp3.HttpUrl
+import okhttp3.ResponseBody
+import okhttp3.Request
+import okhttp3.Headers
+import okhttp3.MultipartBody
+import okhttp3.Call
+import okhttp3.Callback
+import okhttp3.Response
+import okhttp3.internal.Util.EMPTY_REQUEST
+import java.io.BufferedWriter
+import java.io.File
+import java.io.FileWriter
+import java.io.IOException
+import java.net.URLConnection
+import java.time.LocalDate
+import java.time.LocalDateTime
+import java.time.LocalTime
+import java.time.OffsetDateTime
+import java.time.OffsetTime
+import java.util.Locale
+import com.squareup.moshi.adapter
+
+open class ApiClient(val baseUrl: String) {
+    companion object {
+        protected const val ContentType = "Content-Type"
+        protected const val Accept = "Accept"
+        protected const val Authorization = "Authorization"
+        protected const val JsonMediaType = "application/json"
+        protected const val FormDataMediaType = "multipart/form-data"
+        protected const val FormUrlEncMediaType = "application/x-www-form-urlencoded"
+        protected const val XmlMediaType = "application/xml"
+
+        val apiKey: MutableMap<String, String> = mutableMapOf()
+        val apiKeyPrefix: MutableMap<String, String> = mutableMapOf()
+        var username: String? = null
+        var password: String? = null
+        var accessToken: String? = null
+        const val baseUrlKey = "org.openapitools.client.baseUrl"
+
+        @JvmStatic
+        val client: OkHttpClient by lazy {
+            builder.build()
+        }
+
+        @JvmStatic
+        val builder: OkHttpClient.Builder = OkHttpClient.Builder()
+    }
+
+    /**
+     * Guess Content-Type header from the given file (defaults to "application/octet-stream").
+     *
+     * @param file The given file
+     * @return The guessed Content-Type
+     */
+    protected fun guessContentTypeFromFile(file: File): String {
+        val contentType = URLConnection.guessContentTypeFromName(file.name)
+        return contentType ?: "application/octet-stream"
+    }
+
+    protected inline fun <reified T> requestBody(content: T, mediaType: String?): RequestBody =
+        when {
+            mediaType == FormDataMediaType ->
+                MultipartBody.Builder()
+                    .setType(MultipartBody.FORM)
+                    .apply {
+                        // content's type *must* be Map<String, PartConfig<*>>
+                        @Suppress("UNCHECKED_CAST")
+                        (content as Map<String, PartConfig<*>>).forEach { (name, part) ->
+                            val contentType = part.headers.remove("Content-Type")
+                            val bodies = if (part.body is Iterable<*>) part.body else listOf(part.body)
+                            bodies.forEach { body ->
+                                val headers = part.headers.toMutableMap() +
+                                    ("Content-Disposition" to "form-data; name=\"$name\"" + if (body is File) "; filename=\"${body.name}\"" else "")
+                                addPart(Headers.of(headers),
+                                    requestSingleBody(body, contentType))
+                            }
+                        }
+                    }.build()
+            else -> requestSingleBody(content, mediaType)
+        }
+
+    protected inline fun <reified T> requestSingleBody(content: T, mediaType: String?): RequestBody =
+        when {
+            content is File -> RequestBody.create(MediaType.parse(mediaType ?: guessContentTypeFromFile(content)), content)
+            mediaType == FormUrlEncMediaType -> {
+                FormBody.Builder().apply {
+                    // content's type *must* be Map<String, PartConfig<*>>
+                    @Suppress("UNCHECKED_CAST")
+                    (content as Map<String, PartConfig<*>>).forEach { (name, part) ->
+                        add(name, parameterToString(part.body))
+                    }
+                }.build()
+            }
+            mediaType == null || mediaType.startsWith("application/") && mediaType.endsWith("json") ->
+                if (content == null) {
+                    EMPTY_REQUEST
+                } else {
+                    RequestBody.create(
+                        MediaType.parse(mediaType ?: JsonMediaType), Serializer.moshi.adapter(T::class.java).toJson(content)
+                    )
+                }
+            mediaType == XmlMediaType -> throw UnsupportedOperationException("xml not currently supported.")
+            // TODO: this should be extended with other serializers
+            else -> throw UnsupportedOperationException("requestBody currently only supports JSON body and File body.")
+        }
+
+    @OptIn(ExperimentalStdlibApi::class)
+    protected inline fun <reified T: Any?> responseBody(body: ResponseBody?, mediaType: String? = JsonMediaType): T? {
+        if(body == null) {
+            return null
+        }
+        if (T::class.java == File::class.java) {
+            // return tempfile
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
+            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            f.deleteOnExit()
+            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
+            return f as T
+        }
+        val bodyContent = body.string()
+        if (bodyContent.isEmpty()) {
+            return null
+        }
+        return when {
+            mediaType==null || (mediaType.startsWith("application/") && mediaType.endsWith("json")) ->
+                Serializer.moshi.adapter<T>().fromJson(bodyContent)
+            else ->  throw UnsupportedOperationException("responseBody currently only supports JSON body.")
+        }
+    }
+
+
+    protected inline fun <reified I, reified T: Any?> request(requestConfig: RequestConfig<I>): ApiResponse<T?> {
+        val httpUrl = HttpUrl.parse(baseUrl) ?: throw IllegalStateException("baseUrl is invalid.")
+
+        val url = httpUrl.newBuilder()
+            .addPathSegments(requestConfig.path.trimStart('/'))
+            .apply {
+                requestConfig.query.forEach { query ->
+                    query.value.forEach { queryValue ->
+                        addQueryParameter(query.key, queryValue)
+                    }
+                }
+            }.build()
+
+        // take content-type/accept from spec or set to default (application/json) if not defined
+        if (requestConfig.headers[ContentType].isNullOrEmpty()) {
+            requestConfig.headers[ContentType] = JsonMediaType
+        }
+        if (requestConfig.headers[Accept].isNullOrEmpty()) {
+            requestConfig.headers[Accept] = JsonMediaType
+        }
+        val headers = requestConfig.headers
+
+        if(headers[ContentType].isNullOrEmpty()) {
+            throw kotlin.IllegalStateException("Missing Content-Type header. This is required.")
+        }
+
+        if(headers[Accept].isNullOrEmpty()) {
+            throw kotlin.IllegalStateException("Missing Accept header. This is required.")
+        }
+
+        // TODO: support multiple contentType options here.
+        val contentType = (headers[ContentType] as String).substringBefore(";").lowercase(Locale.getDefault())
+
+        val request = when (requestConfig.method) {
+            RequestMethod.DELETE -> Request.Builder().url(url).delete(requestBody(requestConfig.body, contentType))
+            RequestMethod.GET -> Request.Builder().url(url)
+            RequestMethod.HEAD -> Request.Builder().url(url).head()
+            RequestMethod.PATCH -> Request.Builder().url(url).patch(requestBody(requestConfig.body, contentType))
+            RequestMethod.PUT -> Request.Builder().url(url).put(requestBody(requestConfig.body, contentType))
+            RequestMethod.POST -> Request.Builder().url(url).post(requestBody(requestConfig.body, contentType))
+            RequestMethod.OPTIONS -> Request.Builder().url(url).method("OPTIONS", null)
+        }.apply {
+            headers.forEach { header -> addHeader(header.key, header.value) }
+        }.build()
+
+        val response = client.newCall(request).execute()
+
+        val accept = response.header(ContentType)?.substringBefore(";")?.lowercase(Locale.getDefault())
+
+        // TODO: handle specific mapping types. e.g. Map<int, Class<?>>
+        return when {
+            response.isRedirect -> Redirection(
+                response.code(),
+                response.headers().toMultimap()
+            )
+            response.isInformational -> Informational(
+                response.message(),
+                response.code(),
+                response.headers().toMultimap()
+            )
+            response.isSuccessful -> Success(
+                responseBody(response.body(), accept),
+                response.code(),
+                response.headers().toMultimap()
+            )
+            response.isClientError -> ClientError(
+                response.message(),
+                response.body()?.string(),
+                response.code(),
+                response.headers().toMultimap()
+            )
+            else -> ServerError(
+                response.message(),
+                response.body()?.string(),
+                response.code(),
+                response.headers().toMultimap()
+            )
+        }
+    }
+
+    protected fun parameterToString(value: Any?): String = when (value) {
+        null -> ""
+        is Array<*> -> toMultiValue(value, "csv").toString()
+        is Iterable<*> -> toMultiValue(value, "csv").toString()
+        is OffsetDateTime, is OffsetTime, is LocalDateTime, is LocalDate, is LocalTime ->
+            parseDateToQueryString(value)
+        else -> value.toString()
+    }
+
+    protected inline fun <reified T: Any> parseDateToQueryString(value : T): String {
+        /*
+        .replace("\"", "") converts the json object string to an actual string for the query parameter.
+        The moshi or gson adapter allows a more generic solution instead of trying to use a native
+        formatter. It also easily allows to provide a simple way to define a custom date format pattern
+        inside a gson/moshi adapter.
+        */
+        return Serializer.moshi.adapter(T::class.java).toJson(value).replace("\"", "")
+    }
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiResponse.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ApiResponse.kt
@ -0,0 +1,43 @@
+package org.openapitools.client.infrastructure
+
+enum class ResponseType {
+    Success, Informational, Redirection, ClientError, ServerError
+}
+
+interface Response
+
+abstract class ApiResponse<T>(val responseType: ResponseType): Response {
+    abstract val statusCode: Int
+    abstract val headers: Map<String,List<String>>
+}
+
+class Success<T>(
+    val data: T,
+    override val statusCode: Int = -1,
+    override val headers: Map<String, List<String>> = mapOf()
+): ApiResponse<T>(ResponseType.Success)
+
+class Informational<T>(
+    val statusText: String,
+    override val statusCode: Int = -1,
+    override val headers: Map<String, List<String>> = mapOf()
+) : ApiResponse<T>(ResponseType.Informational)
+
+class Redirection<T>(
+    override val statusCode: Int = -1,
+    override val headers: Map<String, List<String>> = mapOf()
+) : ApiResponse<T>(ResponseType.Redirection)
+
+class ClientError<T>(
+    val message: String? = null,
+    val body: Any? = null,
+    override val statusCode: Int = -1,
+    override val headers: Map<String, List<String>> = mapOf()
+) : ApiResponse<T>(ResponseType.ClientError)
+
+class ServerError<T>(
+    val message: String? = null,
+    val body: Any? = null,
+    override val statusCode: Int = -1,
+    override val headers: Map<String, List<String>>
+): ApiResponse<T>(ResponseType.ServerError)
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/BigDecimalAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/BigDecimalAdapter.kt
@ -0,0 +1,17 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+import java.math.BigDecimal
+
+class BigDecimalAdapter {
+    @ToJson
+    fun toJson(value: BigDecimal): String {
+        return value.toPlainString()
+    }
+
+    @FromJson
+    fun fromJson(value: String): BigDecimal {
+        return BigDecimal(value)
+    }
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/BigIntegerAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/BigIntegerAdapter.kt
@ -0,0 +1,17 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+import java.math.BigInteger
+
+class BigIntegerAdapter {
+    @ToJson
+    fun toJson(value: BigInteger): String {
+        return value.toString()
+    }
+
+    @FromJson
+    fun fromJson(value: String): BigInteger {
+        return BigInteger(value)
+    }
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ByteArrayAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ByteArrayAdapter.kt
@ -0,0 +1,12 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+
+class ByteArrayAdapter {
+    @ToJson
+    fun toJson(data: ByteArray): String = String(data)
+
+    @FromJson
+    fun fromJson(data: String): ByteArray = data.toByteArray()
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/Errors.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/Errors.kt
@ -0,0 +1,18 @@
+@file:Suppress("unused")
+package org.openapitools.client.infrastructure
+
+import java.lang.RuntimeException
+
+open class ClientException(message: kotlin.String? = null, val statusCode: Int = -1, val response: Response? = null) : RuntimeException(message) {
+
+    companion object {
+        private const val serialVersionUID: Long = 123L
+    }
+}
+
+open class ServerException(message: kotlin.String? = null, val statusCode: Int = -1, val response: Response? = null) : RuntimeException(message) {
+
+    companion object {
+        private const val serialVersionUID: Long = 456L
+    }
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/LocalDateAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/LocalDateAdapter.kt
@ -0,0 +1,19 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+import java.time.LocalDate
+import java.time.format.DateTimeFormatter
+
+class LocalDateAdapter {
+    @ToJson
+    fun toJson(value: LocalDate): String {
+        return DateTimeFormatter.ISO_LOCAL_DATE.format(value)
+    }
+
+    @FromJson
+    fun fromJson(value: String): LocalDate {
+        return LocalDate.parse(value, DateTimeFormatter.ISO_LOCAL_DATE)
+    }
+
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/LocalDateTimeAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/LocalDateTimeAdapter.kt
@ -0,0 +1,19 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+import java.time.LocalDateTime
+import java.time.format.DateTimeFormatter
+
+class LocalDateTimeAdapter {
+    @ToJson
+    fun toJson(value: LocalDateTime): String {
+        return DateTimeFormatter.ISO_LOCAL_DATE_TIME.format(value)
+    }
+
+    @FromJson
+    fun fromJson(value: String): LocalDateTime {
+        return LocalDateTime.parse(value, DateTimeFormatter.ISO_LOCAL_DATE_TIME)
+    }
+
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/OffsetDateTimeAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/OffsetDateTimeAdapter.kt
@ -0,0 +1,19 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+import java.time.OffsetDateTime
+import java.time.format.DateTimeFormatter
+
+class OffsetDateTimeAdapter {
+    @ToJson
+    fun toJson(value: OffsetDateTime): String {
+        return DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(value)
+    }
+
+    @FromJson
+    fun fromJson(value: String): OffsetDateTime {
+        return OffsetDateTime.parse(value, DateTimeFormatter.ISO_OFFSET_DATE_TIME)
+    }
+
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/PartConfig.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/PartConfig.kt
@ -0,0 +1,11 @@
+package org.openapitools.client.infrastructure
+
+/**
+ * Defines a config object for a given part of a multi-part request.
+ * NOTE: Headers is a Map<String,String> because rfc2616 defines
+ *       multi-valued headers as csv-only.
+ */
+data class PartConfig<T>(
+    val headers: MutableMap<String, String> = mutableMapOf(),
+    val body: T? = null
+)
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/RequestConfig.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/RequestConfig.kt
@ -0,0 +1,17 @@
+package org.openapitools.client.infrastructure
+
+/**
+ * Defines a config object for a given request.
+ * NOTE: This object doesn't include 'body' because it
+ *       allows for caching of the constructed object
+ *       for many request definitions.
+ * NOTE: Headers is a Map<String,String> because rfc2616 defines
+ *       multi-valued headers as csv-only.
+ */
+data class RequestConfig<T>(
+    val method: RequestMethod,
+    val path: String,
+    val headers: MutableMap<String, String> = mutableMapOf(),
+    val query: MutableMap<String, List<String>> = mutableMapOf(),
+    val body: T? = null
+)
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/RequestMethod.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/RequestMethod.kt
@ -0,0 +1,8 @@
+package org.openapitools.client.infrastructure
+
+/**
+ * Provides enumerated HTTP verbs
+ */
+enum class RequestMethod {
+    GET, DELETE, HEAD, OPTIONS, PATCH, POST, PUT
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ResponseExtensions.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/ResponseExtensions.kt
@ -0,0 +1,24 @@
+package org.openapitools.client.infrastructure
+
+import okhttp3.Response
+
+/**
+ * Provides an extension to evaluation whether the response is a 1xx code
+ */
+val Response.isInformational : Boolean get() = this.code() in 100..199
+
+/**
+ * Provides an extension to evaluation whether the response is a 3xx code
+ */
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER")
+val Response.isRedirect : Boolean get() = this.code() in 300..399
+
+/**
+ * Provides an extension to evaluation whether the response is a 4xx code
+ */
+val Response.isClientError : Boolean get() = this.code() in 400..499
+
+/**
+ * Provides an extension to evaluation whether the response is a 5xx (Standard) through 999 (non-standard) code
+ */
+val Response.isServerError : Boolean get() = this.code() in 500..999
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/Serializer.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/Serializer.kt
@ -0,0 +1,23 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.Moshi
+import com.squareup.moshi.kotlin.reflect.KotlinJsonAdapterFactory
+
+object Serializer {
+    @JvmStatic
+    val moshiBuilder: Moshi.Builder = Moshi.Builder()
+        .add(OffsetDateTimeAdapter())
+        .add(LocalDateTimeAdapter())
+        .add(LocalDateAdapter())
+        .add(UUIDAdapter())
+        .add(ByteArrayAdapter())
+        .add(URIAdapter())
+        .add(KotlinJsonAdapterFactory())
+        .add(BigDecimalAdapter())
+        .add(BigIntegerAdapter())
+
+    @JvmStatic
+    val moshi: Moshi by lazy {
+        moshiBuilder.build()
+    }
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/URIAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/URIAdapter.kt
@ -0,0 +1,13 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+import java.net.URI
+
+class URIAdapter {
+    @ToJson
+    fun toJson(uri: URI) = uri.toString()
+
+    @FromJson
+    fun fromJson(s: String): URI = URI.create(s)
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/UUIDAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/infrastructure/UUIDAdapter.kt
@ -0,0 +1,13 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+import java.util.UUID
+
+class UUIDAdapter {
+    @ToJson
+    fun toJson(uuid: UUID) = uuid.toString()
+
+    @FromJson
+    fun fromJson(s: String): UUID = UUID.fromString(s)
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/models/Apa.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp3/src/main/kotlin/org/openapitools/client/models/Apa.kt
@ -0,0 +1,50 @@
+/**
+ * Demo
+ *
+ * No description provided (generated by Openapi Generator https://github.com/openapitools/openapi-generator)
+ *
+ * The version of the OpenAPI document: 1.0.0
+ * 
+ *
+ * Please note:
+ * This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * Do not edit this file manually.
+ */
+
+@file:Suppress(
+    "ArrayInDataClass",
+    "EnumEntryName",
+    "RemoveRedundantQualifierName",
+    "UnusedImport"
+)
+
+package org.openapitools.client.models
+
+
+import com.squareup.moshi.Json
+
+/**
+ * 
+ *
+ * @param i0 
+ * @param n0 
+ * @param i1 
+ * @param n1 
+ */
+
+data class Apa (
+
+    @Json(name = "i0")
+    val i0: kotlin.Int,
+
+    @Json(name = "n0")
+    val n0: java.math.BigDecimal,
+
+    @Json(name = "i1")
+    val i1: kotlin.Int? = null,
+
+    @Json(name = "n1")
+    val n1: java.math.BigDecimal? = null
+
+)
+
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/.openapi-generator-ignore
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/.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
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/.openapi-generator/FILES
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/.openapi-generator/FILES
@ -0,0 +1,28 @@
+README.md
+build.gradle
+docs/Apa.md
+docs/DefaultApi.md
+gradle/wrapper/gradle-wrapper.jar
+gradle/wrapper/gradle-wrapper.properties
+gradlew
+gradlew.bat
+settings.gradle
+src/main/kotlin/org/openapitools/client/apis/DefaultApi.kt
+src/main/kotlin/org/openapitools/client/infrastructure/ApiAbstractions.kt
+src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+src/main/kotlin/org/openapitools/client/infrastructure/ApiResponse.kt
+src/main/kotlin/org/openapitools/client/infrastructure/BigDecimalAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/BigIntegerAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/ByteArrayAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/Errors.kt
+src/main/kotlin/org/openapitools/client/infrastructure/LocalDateAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/LocalDateTimeAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/OffsetDateTimeAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/PartConfig.kt
+src/main/kotlin/org/openapitools/client/infrastructure/RequestConfig.kt
+src/main/kotlin/org/openapitools/client/infrastructure/RequestMethod.kt
+src/main/kotlin/org/openapitools/client/infrastructure/ResponseExtensions.kt
+src/main/kotlin/org/openapitools/client/infrastructure/Serializer.kt
+src/main/kotlin/org/openapitools/client/infrastructure/URIAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/UUIDAdapter.kt
+src/main/kotlin/org/openapitools/client/models/Apa.kt
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/.openapi-generator/VERSION
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/.openapi-generator/VERSION
@ -0,0 +1 @@
+6.0.0-SNAPSHOT
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/README.md
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/README.md
@ -0,0 +1,50 @@
+# org.openapitools.client - Kotlin client library for Demo
+
+## Requires
+
+* Kotlin 1.4.30
+* Gradle 6.8.3
+
+## Build
+
+First, create the gradle wrapper script:
+
+```
+gradle wrapper
+```
+
+Then, run:
+
+```
+./gradlew check assemble
+```
+
+This runs all tests and packages the library.
+
+## Features/Implementation Notes
+
+* Supports JSON inputs/outputs, File inputs, and Form inputs.
+* Supports collection formats for query parameters: csv, tsv, ssv, pipes.
+* Some Kotlin and Java types are fully qualified to avoid conflicts with types defined in OpenAPI definitions.
+* Implementation of ApiClient is intended to reduce method counts, specifically to benefit Android targets.
+
+<a name="documentation-for-api-endpoints"></a>
+## Documentation for API Endpoints
+
+All URIs are relative to *http://localhost*
+
+Class | Method | HTTP request | Description
+------------ | ------------- | ------------- | -------------
+*DefaultApi* | [**test**](docs/DefaultApi.md#test) | **POST** /test | Tests default values
+
+
+<a name="documentation-for-models"></a>
+## Documentation for Models
+
+ - [org.openapitools.client.models.Apa](docs/Apa.md)
+
+
+<a name="documentation-for-authorization"></a>
+## Documentation for Authorization
+
+All endpoints do not require authorization.
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/build.gradle
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/build.gradle
@ -0,0 +1,37 @@
+group 'org.openapitools'
+version '1.0.0'
+
+wrapper {
+    gradleVersion = '6.8.3'
+    distributionUrl = "https://services.gradle.org/distributions/gradle-$gradleVersion-all.zip"
+}
+
+buildscript {
+    ext.kotlin_version = '1.5.10'
+
+    repositories {
+        maven { url "https://repo1.maven.org/maven2" }
+    }
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+apply plugin: 'kotlin'
+
+repositories {
+    maven { url "https://repo1.maven.org/maven2" }
+}
+
+test {
+    useJUnitPlatform()
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+    implementation "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
+    implementation "com.squareup.moshi:moshi-kotlin:1.12.0"
+    implementation "com.squareup.moshi:moshi-adapters:1.12.0"
+    implementation "com.squareup.okhttp3:okhttp:4.9.1"
+    testImplementation "io.kotlintest:kotlintest-runner-junit5:3.4.2"
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/docs/Apa.md
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/docs/Apa.md
@ -0,0 +1,13 @@
+
+# Apa
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**i0** | **kotlin.Int** |  | 
+**n0** | [**java.math.BigDecimal**](java.math.BigDecimal.md) |  | 
+**i1** | **kotlin.Int** |  |  [optional]
+**n1** | [**java.math.BigDecimal**](java.math.BigDecimal.md) |  |  [optional]
+
+
+
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/docs/DefaultApi.md
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/docs/DefaultApi.md
@ -0,0 +1,109 @@
+# DefaultApi
+
+All URIs are relative to *http://localhost*
+
+Method | HTTP request | Description
+------------- | ------------- | -------------
+[**test**](DefaultApi.md#test) | **POST** /test | Tests default values
+
+
+<a name="test"></a>
+# **test**
+> test(pi0, pi1, pn0, pn1, qi0, qi1, qi2, qi3, qn0, qn1, qn2, qn3, hi0, hi1, hi2, hi3, hn0, hn1, hn2, hn3, fi0, fi1, fi2, fi3, fn0, fn1, fn2, fn3)
+
+Tests default values
+
+Tests default values of different parameters
+
+### Example
+```kotlin
+// Import classes:
+//import org.openapitools.client.infrastructure.*
+//import org.openapitools.client.models.*
+
+val apiInstance = DefaultApi()
+val pi0 : kotlin.Int = 56 // kotlin.Int | 
+val pi1 : kotlin.Int = 56 // kotlin.Int | 
+val pn0 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val pn1 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val qi0 : kotlin.Int = 56 // kotlin.Int | 
+val qi1 : kotlin.Int = 56 // kotlin.Int | 
+val qi2 : kotlin.Int = 56 // kotlin.Int | 
+val qi3 : kotlin.Int = 56 // kotlin.Int | 
+val qn0 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val qn1 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val qn2 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val qn3 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val hi0 : kotlin.Int = 56 // kotlin.Int | 
+val hi1 : kotlin.Int = 56 // kotlin.Int | 
+val hi2 : kotlin.Int = 56 // kotlin.Int | 
+val hi3 : kotlin.Int = 56 // kotlin.Int | 
+val hn0 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val hn1 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val hn2 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val hn3 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val fi0 : kotlin.Int = 56 // kotlin.Int | 
+val fi1 : kotlin.Int = 56 // kotlin.Int | 
+val fi2 : kotlin.Int = 56 // kotlin.Int | 
+val fi3 : kotlin.Int = 56 // kotlin.Int | 
+val fn0 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val fn1 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val fn2 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val fn3 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+try {
+    apiInstance.test(pi0, pi1, pn0, pn1, qi0, qi1, qi2, qi3, qn0, qn1, qn2, qn3, hi0, hi1, hi2, hi3, hn0, hn1, hn2, hn3, fi0, fi1, fi2, fi3, fn0, fn1, fn2, fn3)
+} catch (e: ClientException) {
+    println("4xx response calling DefaultApi#test")
+    e.printStackTrace()
+} catch (e: ServerException) {
+    println("5xx response calling DefaultApi#test")
+    e.printStackTrace()
+}
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **pi0** | **kotlin.Int**|  | [default to 10]
+ **pi1** | **kotlin.Int**|  |
+ **pn0** | **java.math.BigDecimal**|  | [default to 10.0]
+ **pn1** | **java.math.BigDecimal**|  |
+ **qi0** | **kotlin.Int**|  | [optional] [default to 10]
+ **qi1** | **kotlin.Int**|  | [default to 71]
+ **qi2** | **kotlin.Int**|  | [optional]
+ **qi3** | **kotlin.Int**|  |
+ **qn0** | **java.math.BigDecimal**|  | [optional] [default to 10.0]
+ **qn1** | **java.math.BigDecimal**|  | [default to 71.0]
+ **qn2** | **java.math.BigDecimal**|  | [optional]
+ **qn3** | **java.math.BigDecimal**|  |
+ **hi0** | **kotlin.Int**|  | [optional] [default to 10]
+ **hi1** | **kotlin.Int**|  | [default to 71]
+ **hi2** | **kotlin.Int**|  | [optional]
+ **hi3** | **kotlin.Int**|  |
+ **hn0** | **java.math.BigDecimal**|  | [optional] [default to 10.0]
+ **hn1** | **java.math.BigDecimal**|  | [default to 71.0]
+ **hn2** | **java.math.BigDecimal**|  | [optional]
+ **hn3** | **java.math.BigDecimal**|  |
+ **fi0** | **kotlin.Int**|  | [optional] [default to 10]
+ **fi1** | **kotlin.Int**|  | [default to 71]
+ **fi2** | **kotlin.Int**|  | [optional]
+ **fi3** | **kotlin.Int**|  |
+ **fn0** | **java.math.BigDecimal**|  | [optional] [default to 10.0]
+ **fn1** | **java.math.BigDecimal**|  | [default to 71.0]
+ **fn2** | **java.math.BigDecimal**|  | [optional]
+ **fn3** | **java.math.BigDecimal**|  |
+
+### Return type
+
+null (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: multipart/form-data
+ - **Accept**: Not defined
+
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/gradle/wrapper/gradle-wrapper.jar
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/gradle/wrapper/gradle-wrapper.jar
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/gradle/wrapper/gradle-wrapper.properties
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/gradle/wrapper/gradle-wrapper.properties
@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.3-all.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/gradlew
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/gradlew
@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/gradlew.bat
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/gradlew.bat
@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/settings.gradle
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/settings.gradle
@ -0,0 +1,2 @@
+
+rootProject.name = 'kotlin-default-values-jvm-okhttp4'
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/apis/DefaultApi.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/apis/DefaultApi.kt
@ -0,0 +1,232 @@
+/**
+ * Demo
+ *
+ * No description provided (generated by Openapi Generator https://github.com/openapitools/openapi-generator)
+ *
+ * The version of the OpenAPI document: 1.0.0
+ * 
+ *
+ * Please note:
+ * This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * Do not edit this file manually.
+ */
+
+@file:Suppress(
+    "ArrayInDataClass",
+    "EnumEntryName",
+    "RemoveRedundantQualifierName",
+    "UnusedImport"
+)
+
+package org.openapitools.client.apis
+
+import java.io.IOException
+
+
+import com.squareup.moshi.Json
+
+import org.openapitools.client.infrastructure.ApiClient
+import org.openapitools.client.infrastructure.ApiResponse
+import org.openapitools.client.infrastructure.ClientException
+import org.openapitools.client.infrastructure.ClientError
+import org.openapitools.client.infrastructure.ServerException
+import org.openapitools.client.infrastructure.ServerError
+import org.openapitools.client.infrastructure.MultiValueMap
+import org.openapitools.client.infrastructure.PartConfig
+import org.openapitools.client.infrastructure.RequestConfig
+import org.openapitools.client.infrastructure.RequestMethod
+import org.openapitools.client.infrastructure.ResponseType
+import org.openapitools.client.infrastructure.Success
+import org.openapitools.client.infrastructure.toMultiValue
+
+class DefaultApi(basePath: kotlin.String = defaultBasePath) : ApiClient(basePath) {
+    companion object {
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty(ApiClient.baseUrlKey, "http://localhost")
+        }
+    }
+
+    /**
+     * Tests default values
+     * Tests default values of different parameters
+     * @param pi0  (default to 10)
+     * @param pi1 
+     * @param pn0  (default to 10.0)
+     * @param pn1 
+     * @param qi0  (optional, default to 10)
+     * @param qi1  (default to 71)
+     * @param qi2  (optional)
+     * @param qi3 
+     * @param qn0  (optional, default to 10.0)
+     * @param qn1  (default to 71.0)
+     * @param qn2  (optional)
+     * @param qn3 
+     * @param hi0  (optional, default to 10)
+     * @param hi1  (default to 71)
+     * @param hi2  (optional)
+     * @param hi3 
+     * @param hn0  (optional, default to 10.0)
+     * @param hn1  (default to 71.0)
+     * @param hn2  (optional)
+     * @param hn3 
+     * @param fi0  (optional, default to 10)
+     * @param fi1  (default to 71)
+     * @param fi2  (optional)
+     * @param fi3 
+     * @param fn0  (optional, default to 10.0)
+     * @param fn1  (default to 71.0)
+     * @param fn2  (optional)
+     * @param fn3 
+     * @return void
+     * @throws IllegalStateException If the request is not correctly configured
+     * @throws IOException Rethrows the OkHttp execute method exception
+     * @throws UnsupportedOperationException If the API returns an informational or redirection response
+     * @throws ClientException If the API returns a client error response
+     * @throws ServerException If the API returns a server error response
+     */
+    @Throws(IllegalStateException::class, IOException::class, UnsupportedOperationException::class, ClientException::class, ServerException::class)
+    fun test(pi0: kotlin.Int = 10, pi1: kotlin.Int, pn0: java.math.BigDecimal = java.math.BigDecimal("10.0"), pn1: java.math.BigDecimal, qi0: kotlin.Int? = 10, qi1: kotlin.Int = 71, qi2: kotlin.Int? = null, qi3: kotlin.Int, qn0: java.math.BigDecimal? = java.math.BigDecimal("10.0"), qn1: java.math.BigDecimal = java.math.BigDecimal("71.0"), qn2: java.math.BigDecimal? = null, qn3: java.math.BigDecimal, hi0: kotlin.Int? = 10, hi1: kotlin.Int = 71, hi2: kotlin.Int? = null, hi3: kotlin.Int, hn0: java.math.BigDecimal? = java.math.BigDecimal("10.0"), hn1: java.math.BigDecimal = java.math.BigDecimal("71.0"), hn2: java.math.BigDecimal? = null, hn3: java.math.BigDecimal, fi0: kotlin.Int? = 10, fi1: kotlin.Int = 71, fi2: kotlin.Int? = null, fi3: kotlin.Int, fn0: java.math.BigDecimal? = java.math.BigDecimal("10.0"), fn1: java.math.BigDecimal = java.math.BigDecimal("71.0"), fn2: java.math.BigDecimal? = null, fn3: java.math.BigDecimal) : Unit {
+        val localVarResponse = testWithHttpInfo(pi0 = pi0, pi1 = pi1, pn0 = pn0, pn1 = pn1, qi0 = qi0, qi1 = qi1, qi2 = qi2, qi3 = qi3, qn0 = qn0, qn1 = qn1, qn2 = qn2, qn3 = qn3, hi0 = hi0, hi1 = hi1, hi2 = hi2, hi3 = hi3, hn0 = hn0, hn1 = hn1, hn2 = hn2, hn3 = hn3, fi0 = fi0, fi1 = fi1, fi2 = fi2, fi3 = fi3, fn0 = fn0, fn1 = fn1, fn2 = fn2, fn3 = fn3)
+
+        return when (localVarResponse.responseType) {
+            ResponseType.Success -> Unit
+            ResponseType.Informational -> throw UnsupportedOperationException("Client does not support Informational responses.")
+            ResponseType.Redirection -> throw UnsupportedOperationException("Client does not support Redirection responses.")
+            ResponseType.ClientError -> {
+                val localVarError = localVarResponse as ClientError<*>
+                throw ClientException("Client error : ${localVarError.statusCode} ${localVarError.message.orEmpty()}", localVarError.statusCode, localVarResponse)
+            }
+            ResponseType.ServerError -> {
+                val localVarError = localVarResponse as ServerError<*>
+                throw ServerException("Server error : ${localVarError.statusCode} ${localVarError.message.orEmpty()}", localVarError.statusCode, localVarResponse)
+            }
+        }
+    }
+
+    /**
+     * Tests default values
+     * Tests default values of different parameters
+     * @param pi0  (default to 10)
+     * @param pi1 
+     * @param pn0  (default to 10.0)
+     * @param pn1 
+     * @param qi0  (optional, default to 10)
+     * @param qi1  (default to 71)
+     * @param qi2  (optional)
+     * @param qi3 
+     * @param qn0  (optional, default to 10.0)
+     * @param qn1  (default to 71.0)
+     * @param qn2  (optional)
+     * @param qn3 
+     * @param hi0  (optional, default to 10)
+     * @param hi1  (default to 71)
+     * @param hi2  (optional)
+     * @param hi3 
+     * @param hn0  (optional, default to 10.0)
+     * @param hn1  (default to 71.0)
+     * @param hn2  (optional)
+     * @param hn3 
+     * @param fi0  (optional, default to 10)
+     * @param fi1  (default to 71)
+     * @param fi2  (optional)
+     * @param fi3 
+     * @param fn0  (optional, default to 10.0)
+     * @param fn1  (default to 71.0)
+     * @param fn2  (optional)
+     * @param fn3 
+     * @return ApiResponse<Unit?>
+     * @throws IllegalStateException If the request is not correctly configured
+     * @throws IOException Rethrows the OkHttp execute method exception
+     */
+    @Throws(IllegalStateException::class, IOException::class)
+    fun testWithHttpInfo(pi0: kotlin.Int, pi1: kotlin.Int, pn0: java.math.BigDecimal, pn1: java.math.BigDecimal, qi0: kotlin.Int?, qi1: kotlin.Int, qi2: kotlin.Int?, qi3: kotlin.Int, qn0: java.math.BigDecimal?, qn1: java.math.BigDecimal, qn2: java.math.BigDecimal?, qn3: java.math.BigDecimal, hi0: kotlin.Int?, hi1: kotlin.Int, hi2: kotlin.Int?, hi3: kotlin.Int, hn0: java.math.BigDecimal?, hn1: java.math.BigDecimal, hn2: java.math.BigDecimal?, hn3: java.math.BigDecimal, fi0: kotlin.Int?, fi1: kotlin.Int, fi2: kotlin.Int?, fi3: kotlin.Int, fn0: java.math.BigDecimal?, fn1: java.math.BigDecimal, fn2: java.math.BigDecimal?, fn3: java.math.BigDecimal) : ApiResponse<Unit?> {
+        val localVariableConfig = testRequestConfig(pi0 = pi0, pi1 = pi1, pn0 = pn0, pn1 = pn1, qi0 = qi0, qi1 = qi1, qi2 = qi2, qi3 = qi3, qn0 = qn0, qn1 = qn1, qn2 = qn2, qn3 = qn3, hi0 = hi0, hi1 = hi1, hi2 = hi2, hi3 = hi3, hn0 = hn0, hn1 = hn1, hn2 = hn2, hn3 = hn3, fi0 = fi0, fi1 = fi1, fi2 = fi2, fi3 = fi3, fn0 = fn0, fn1 = fn1, fn2 = fn2, fn3 = fn3)
+
+        return request<Map<String, PartConfig<*>>, Unit>(
+            localVariableConfig
+        )
+    }
+
+    /**
+     * To obtain the request config of the operation test
+     *
+     * @param pi0  (default to 10)
+     * @param pi1 
+     * @param pn0  (default to 10.0)
+     * @param pn1 
+     * @param qi0  (optional, default to 10)
+     * @param qi1  (default to 71)
+     * @param qi2  (optional)
+     * @param qi3 
+     * @param qn0  (optional, default to 10.0)
+     * @param qn1  (default to 71.0)
+     * @param qn2  (optional)
+     * @param qn3 
+     * @param hi0  (optional, default to 10)
+     * @param hi1  (default to 71)
+     * @param hi2  (optional)
+     * @param hi3 
+     * @param hn0  (optional, default to 10.0)
+     * @param hn1  (default to 71.0)
+     * @param hn2  (optional)
+     * @param hn3 
+     * @param fi0  (optional, default to 10)
+     * @param fi1  (default to 71)
+     * @param fi2  (optional)
+     * @param fi3 
+     * @param fn0  (optional, default to 10.0)
+     * @param fn1  (default to 71.0)
+     * @param fn2  (optional)
+     * @param fn3 
+     * @return RequestConfig
+     */
+    fun testRequestConfig(pi0: kotlin.Int, pi1: kotlin.Int, pn0: java.math.BigDecimal, pn1: java.math.BigDecimal, qi0: kotlin.Int?, qi1: kotlin.Int, qi2: kotlin.Int?, qi3: kotlin.Int, qn0: java.math.BigDecimal?, qn1: java.math.BigDecimal, qn2: java.math.BigDecimal?, qn3: java.math.BigDecimal, hi0: kotlin.Int?, hi1: kotlin.Int, hi2: kotlin.Int?, hi3: kotlin.Int, hn0: java.math.BigDecimal?, hn1: java.math.BigDecimal, hn2: java.math.BigDecimal?, hn3: java.math.BigDecimal, fi0: kotlin.Int?, fi1: kotlin.Int, fi2: kotlin.Int?, fi3: kotlin.Int, fn0: java.math.BigDecimal?, fn1: java.math.BigDecimal, fn2: java.math.BigDecimal?, fn3: java.math.BigDecimal) : RequestConfig<Map<String, PartConfig<*>>> {
+        val localVariableBody = mapOf(
+            "fi0" to PartConfig(body = fi0, headers = mutableMapOf()),
+            "fi1" to PartConfig(body = fi1, headers = mutableMapOf()),
+            "fi2" to PartConfig(body = fi2, headers = mutableMapOf()),
+            "fi3" to PartConfig(body = fi3, headers = mutableMapOf()),
+            "fn0" to PartConfig(body = fn0, headers = mutableMapOf()),
+            "fn1" to PartConfig(body = fn1, headers = mutableMapOf()),
+            "fn2" to PartConfig(body = fn2, headers = mutableMapOf()),
+            "fn3" to PartConfig(body = fn3, headers = mutableMapOf()),)
+        val localVariableQuery: MultiValueMap = mutableMapOf<kotlin.String, kotlin.collections.List<kotlin.String>>()
+            .apply {
+                if (qi0 != null) {
+                    put("qi0", listOf(qi0.toString()))
+                }
+                put("qi1", listOf(qi1.toString()))
+                if (qi2 != null) {
+                    put("qi2", listOf(qi2.toString()))
+                }
+                put("qi3", listOf(qi3.toString()))
+                if (qn0 != null) {
+                    put("qn0", listOf(qn0.toString()))
+                }
+                put("qn1", listOf(qn1.toString()))
+                if (qn2 != null) {
+                    put("qn2", listOf(qn2.toString()))
+                }
+                put("qn3", listOf(qn3.toString()))
+            }
+        val localVariableHeaders: MutableMap<String, String> = mutableMapOf("Content-Type" to "multipart/form-data")
+        hi0?.apply { localVariableHeaders["hi0"] = this.toString() }
+        hi1.apply { localVariableHeaders["hi1"] = this.toString() }
+        hi2?.apply { localVariableHeaders["hi2"] = this.toString() }
+        hi3.apply { localVariableHeaders["hi3"] = this.toString() }
+        hn0?.apply { localVariableHeaders["hn0"] = this.toString() }
+        hn1.apply { localVariableHeaders["hn1"] = this.toString() }
+        hn2?.apply { localVariableHeaders["hn2"] = this.toString() }
+        hn3.apply { localVariableHeaders["hn3"] = this.toString() }
+        
+        return RequestConfig(
+            method = RequestMethod.POST,
+            path = "/test".replace("{"+"pi0"+"}", "$pi0").replace("{"+"pi1"+"}", "$pi1").replace("{"+"pn0"+"}", "$pn0").replace("{"+"pn1"+"}", "$pn1"),
+            query = localVariableQuery,
+            headers = localVariableHeaders,
+            body = localVariableBody
+        )
+    }
+
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiAbstractions.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiAbstractions.kt
@ -0,0 +1,23 @@
+package org.openapitools.client.infrastructure
+
+typealias MultiValueMap = MutableMap<String,List<String>>
+
+fun collectionDelimiter(collectionFormat: String) = when(collectionFormat) {
+    "csv" -> ","
+    "tsv" -> "\t"
+    "pipe" -> "|"
+    "space" -> " "
+    else -> ""
+}
+
+val defaultMultiValueConverter: (item: Any?) -> String = { item -> "$item" }
+
+fun <T : Any?> toMultiValue(items: Array<T>, collectionFormat: String, map: (item: T) -> String = defaultMultiValueConverter)
+        = toMultiValue(items.asIterable(), collectionFormat, map)
+
+fun <T : Any?> toMultiValue(items: Iterable<T>, collectionFormat: String, map: (item: T) -> String = defaultMultiValueConverter): List<String> {
+    return when(collectionFormat) {
+        "multi" -> items.map(map)
+        else -> listOf(items.joinToString(separator = collectionDelimiter(collectionFormat), transform = map))
+    }
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@ -0,0 +1,238 @@
+package org.openapitools.client.infrastructure
+
+import okhttp3.OkHttpClient
+import okhttp3.RequestBody
+import okhttp3.RequestBody.Companion.asRequestBody
+import okhttp3.RequestBody.Companion.toRequestBody
+import okhttp3.FormBody
+import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
+import okhttp3.ResponseBody
+import okhttp3.MediaType.Companion.toMediaTypeOrNull
+import okhttp3.Request
+import okhttp3.Headers
+import okhttp3.Headers.Companion.toHeaders
+import okhttp3.MultipartBody
+import okhttp3.Call
+import okhttp3.Callback
+import okhttp3.Response
+import okhttp3.internal.EMPTY_REQUEST
+import java.io.BufferedWriter
+import java.io.File
+import java.io.FileWriter
+import java.io.IOException
+import java.net.URLConnection
+import java.time.LocalDate
+import java.time.LocalDateTime
+import java.time.LocalTime
+import java.time.OffsetDateTime
+import java.time.OffsetTime
+import java.util.Locale
+import com.squareup.moshi.adapter
+
+open class ApiClient(val baseUrl: String) {
+    companion object {
+        protected const val ContentType = "Content-Type"
+        protected const val Accept = "Accept"
+        protected const val Authorization = "Authorization"
+        protected const val JsonMediaType = "application/json"
+        protected const val FormDataMediaType = "multipart/form-data"
+        protected const val FormUrlEncMediaType = "application/x-www-form-urlencoded"
+        protected const val XmlMediaType = "application/xml"
+
+        val apiKey: MutableMap<String, String> = mutableMapOf()
+        val apiKeyPrefix: MutableMap<String, String> = mutableMapOf()
+        var username: String? = null
+        var password: String? = null
+        var accessToken: String? = null
+        const val baseUrlKey = "org.openapitools.client.baseUrl"
+
+        @JvmStatic
+        val client: OkHttpClient by lazy {
+            builder.build()
+        }
+
+        @JvmStatic
+        val builder: OkHttpClient.Builder = OkHttpClient.Builder()
+    }
+
+    /**
+     * Guess Content-Type header from the given file (defaults to "application/octet-stream").
+     *
+     * @param file The given file
+     * @return The guessed Content-Type
+     */
+    protected fun guessContentTypeFromFile(file: File): String {
+        val contentType = URLConnection.guessContentTypeFromName(file.name)
+        return contentType ?: "application/octet-stream"
+    }
+
+    protected inline fun <reified T> requestBody(content: T, mediaType: String?): RequestBody =
+        when {
+            mediaType == FormDataMediaType ->
+                MultipartBody.Builder()
+                    .setType(MultipartBody.FORM)
+                    .apply {
+                        // content's type *must* be Map<String, PartConfig<*>>
+                        @Suppress("UNCHECKED_CAST")
+                        (content as Map<String, PartConfig<*>>).forEach { (name, part) ->
+                            val contentType = part.headers.remove("Content-Type")
+                            val bodies = if (part.body is Iterable<*>) part.body else listOf(part.body)
+                            bodies.forEach { body ->
+                                val headers = part.headers.toMutableMap() +
+                                    ("Content-Disposition" to "form-data; name=\"$name\"" + if (body is File) "; filename=\"${body.name}\"" else "")
+                                addPart(headers.toHeaders(),
+                                    requestSingleBody(body, contentType))
+                            }
+                        }
+                    }.build()
+            else -> requestSingleBody(content, mediaType)
+        }
+
+    protected inline fun <reified T> requestSingleBody(content: T, mediaType: String?): RequestBody =
+        when {
+            content is File -> content.asRequestBody((mediaType ?: guessContentTypeFromFile(content)).toMediaTypeOrNull())
+            mediaType == FormUrlEncMediaType -> {
+                FormBody.Builder().apply {
+                    // content's type *must* be Map<String, PartConfig<*>>
+                    @Suppress("UNCHECKED_CAST")
+                    (content as Map<String, PartConfig<*>>).forEach { (name, part) ->
+                        add(name, parameterToString(part.body))
+                    }
+                }.build()
+            }
+            mediaType == null || mediaType.startsWith("application/") && mediaType.endsWith("json") ->
+                if (content == null) {
+                    EMPTY_REQUEST
+                } else {
+                    Serializer.moshi.adapter(T::class.java).toJson(content)
+                        .toRequestBody((mediaType ?: JsonMediaType).toMediaTypeOrNull())
+                }
+            mediaType == XmlMediaType -> throw UnsupportedOperationException("xml not currently supported.")
+            // TODO: this should be extended with other serializers
+            else -> throw UnsupportedOperationException("requestBody currently only supports JSON body and File body.")
+        }
+
+    @OptIn(ExperimentalStdlibApi::class)
+    protected inline fun <reified T: Any?> responseBody(body: ResponseBody?, mediaType: String? = JsonMediaType): T? {
+        if(body == null) {
+            return null
+        }
+        if (T::class.java == File::class.java) {
+            // return tempfile
+            // Attention: if you are developing an android app that supports API Level 25 and bellow, please check flag supportAndroidApiLevel25AndBelow in https://openapi-generator.tech/docs/generators/kotlin#config-options
+            val f = java.nio.file.Files.createTempFile("tmp.org.openapitools.client", null).toFile()
+            f.deleteOnExit()
+            body.byteStream().use { java.nio.file.Files.copy(it, f.toPath(), java.nio.file.StandardCopyOption.REPLACE_EXISTING) }
+            return f as T
+        }
+        val bodyContent = body.string()
+        if (bodyContent.isEmpty()) {
+            return null
+        }
+        return when {
+            mediaType==null || (mediaType.startsWith("application/") && mediaType.endsWith("json")) ->
+                Serializer.moshi.adapter<T>().fromJson(bodyContent)
+            else ->  throw UnsupportedOperationException("responseBody currently only supports JSON body.")
+        }
+    }
+
+
+    protected inline fun <reified I, reified T: Any?> request(requestConfig: RequestConfig<I>): ApiResponse<T?> {
+        val httpUrl = baseUrl.toHttpUrlOrNull() ?: throw IllegalStateException("baseUrl is invalid.")
+
+        val url = httpUrl.newBuilder()
+            .addPathSegments(requestConfig.path.trimStart('/'))
+            .apply {
+                requestConfig.query.forEach { query ->
+                    query.value.forEach { queryValue ->
+                        addQueryParameter(query.key, queryValue)
+                    }
+                }
+            }.build()
+
+        // take content-type/accept from spec or set to default (application/json) if not defined
+        if (requestConfig.headers[ContentType].isNullOrEmpty()) {
+            requestConfig.headers[ContentType] = JsonMediaType
+        }
+        if (requestConfig.headers[Accept].isNullOrEmpty()) {
+            requestConfig.headers[Accept] = JsonMediaType
+        }
+        val headers = requestConfig.headers
+
+        if(headers[ContentType].isNullOrEmpty()) {
+            throw kotlin.IllegalStateException("Missing Content-Type header. This is required.")
+        }
+
+        if(headers[Accept].isNullOrEmpty()) {
+            throw kotlin.IllegalStateException("Missing Accept header. This is required.")
+        }
+
+        // TODO: support multiple contentType options here.
+        val contentType = (headers[ContentType] as String).substringBefore(";").lowercase(Locale.getDefault())
+
+        val request = when (requestConfig.method) {
+            RequestMethod.DELETE -> Request.Builder().url(url).delete(requestBody(requestConfig.body, contentType))
+            RequestMethod.GET -> Request.Builder().url(url)
+            RequestMethod.HEAD -> Request.Builder().url(url).head()
+            RequestMethod.PATCH -> Request.Builder().url(url).patch(requestBody(requestConfig.body, contentType))
+            RequestMethod.PUT -> Request.Builder().url(url).put(requestBody(requestConfig.body, contentType))
+            RequestMethod.POST -> Request.Builder().url(url).post(requestBody(requestConfig.body, contentType))
+            RequestMethod.OPTIONS -> Request.Builder().url(url).method("OPTIONS", null)
+        }.apply {
+            headers.forEach { header -> addHeader(header.key, header.value) }
+        }.build()
+
+        val response = client.newCall(request).execute()
+
+        val accept = response.header(ContentType)?.substringBefore(";")?.lowercase(Locale.getDefault())
+
+        // TODO: handle specific mapping types. e.g. Map<int, Class<?>>
+        return when {
+            response.isRedirect -> Redirection(
+                response.code,
+                response.headers.toMultimap()
+            )
+            response.isInformational -> Informational(
+                response.message,
+                response.code,
+                response.headers.toMultimap()
+            )
+            response.isSuccessful -> Success(
+                responseBody(response.body, accept),
+                response.code,
+                response.headers.toMultimap()
+            )
+            response.isClientError -> ClientError(
+                response.message,
+                response.body?.string(),
+                response.code,
+                response.headers.toMultimap()
+            )
+            else -> ServerError(
+                response.message,
+                response.body?.string(),
+                response.code,
+                response.headers.toMultimap()
+            )
+        }
+    }
+
+    protected fun parameterToString(value: Any?): String = when (value) {
+        null -> ""
+        is Array<*> -> toMultiValue(value, "csv").toString()
+        is Iterable<*> -> toMultiValue(value, "csv").toString()
+        is OffsetDateTime, is OffsetTime, is LocalDateTime, is LocalDate, is LocalTime ->
+            parseDateToQueryString(value)
+        else -> value.toString()
+    }
+
+    protected inline fun <reified T: Any> parseDateToQueryString(value : T): String {
+        /*
+        .replace("\"", "") converts the json object string to an actual string for the query parameter.
+        The moshi or gson adapter allows a more generic solution instead of trying to use a native
+        formatter. It also easily allows to provide a simple way to define a custom date format pattern
+        inside a gson/moshi adapter.
+        */
+        return Serializer.moshi.adapter(T::class.java).toJson(value).replace("\"", "")
+    }
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiResponse.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ApiResponse.kt
@ -0,0 +1,43 @@
+package org.openapitools.client.infrastructure
+
+enum class ResponseType {
+    Success, Informational, Redirection, ClientError, ServerError
+}
+
+interface Response
+
+abstract class ApiResponse<T>(val responseType: ResponseType): Response {
+    abstract val statusCode: Int
+    abstract val headers: Map<String,List<String>>
+}
+
+class Success<T>(
+    val data: T,
+    override val statusCode: Int = -1,
+    override val headers: Map<String, List<String>> = mapOf()
+): ApiResponse<T>(ResponseType.Success)
+
+class Informational<T>(
+    val statusText: String,
+    override val statusCode: Int = -1,
+    override val headers: Map<String, List<String>> = mapOf()
+) : ApiResponse<T>(ResponseType.Informational)
+
+class Redirection<T>(
+    override val statusCode: Int = -1,
+    override val headers: Map<String, List<String>> = mapOf()
+) : ApiResponse<T>(ResponseType.Redirection)
+
+class ClientError<T>(
+    val message: String? = null,
+    val body: Any? = null,
+    override val statusCode: Int = -1,
+    override val headers: Map<String, List<String>> = mapOf()
+) : ApiResponse<T>(ResponseType.ClientError)
+
+class ServerError<T>(
+    val message: String? = null,
+    val body: Any? = null,
+    override val statusCode: Int = -1,
+    override val headers: Map<String, List<String>>
+): ApiResponse<T>(ResponseType.ServerError)
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/BigDecimalAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/BigDecimalAdapter.kt
@ -0,0 +1,17 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+import java.math.BigDecimal
+
+class BigDecimalAdapter {
+    @ToJson
+    fun toJson(value: BigDecimal): String {
+        return value.toPlainString()
+    }
+
+    @FromJson
+    fun fromJson(value: String): BigDecimal {
+        return BigDecimal(value)
+    }
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/BigIntegerAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/BigIntegerAdapter.kt
@ -0,0 +1,17 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+import java.math.BigInteger
+
+class BigIntegerAdapter {
+    @ToJson
+    fun toJson(value: BigInteger): String {
+        return value.toString()
+    }
+
+    @FromJson
+    fun fromJson(value: String): BigInteger {
+        return BigInteger(value)
+    }
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ByteArrayAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ByteArrayAdapter.kt
@ -0,0 +1,12 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+
+class ByteArrayAdapter {
+    @ToJson
+    fun toJson(data: ByteArray): String = String(data)
+
+    @FromJson
+    fun fromJson(data: String): ByteArray = data.toByteArray()
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/Errors.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/Errors.kt
@ -0,0 +1,18 @@
+@file:Suppress("unused")
+package org.openapitools.client.infrastructure
+
+import java.lang.RuntimeException
+
+open class ClientException(message: kotlin.String? = null, val statusCode: Int = -1, val response: Response? = null) : RuntimeException(message) {
+
+    companion object {
+        private const val serialVersionUID: Long = 123L
+    }
+}
+
+open class ServerException(message: kotlin.String? = null, val statusCode: Int = -1, val response: Response? = null) : RuntimeException(message) {
+
+    companion object {
+        private const val serialVersionUID: Long = 456L
+    }
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/LocalDateAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/LocalDateAdapter.kt
@ -0,0 +1,19 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+import java.time.LocalDate
+import java.time.format.DateTimeFormatter
+
+class LocalDateAdapter {
+    @ToJson
+    fun toJson(value: LocalDate): String {
+        return DateTimeFormatter.ISO_LOCAL_DATE.format(value)
+    }
+
+    @FromJson
+    fun fromJson(value: String): LocalDate {
+        return LocalDate.parse(value, DateTimeFormatter.ISO_LOCAL_DATE)
+    }
+
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/LocalDateTimeAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/LocalDateTimeAdapter.kt
@ -0,0 +1,19 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+import java.time.LocalDateTime
+import java.time.format.DateTimeFormatter
+
+class LocalDateTimeAdapter {
+    @ToJson
+    fun toJson(value: LocalDateTime): String {
+        return DateTimeFormatter.ISO_LOCAL_DATE_TIME.format(value)
+    }
+
+    @FromJson
+    fun fromJson(value: String): LocalDateTime {
+        return LocalDateTime.parse(value, DateTimeFormatter.ISO_LOCAL_DATE_TIME)
+    }
+
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/OffsetDateTimeAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/OffsetDateTimeAdapter.kt
@ -0,0 +1,19 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+import java.time.OffsetDateTime
+import java.time.format.DateTimeFormatter
+
+class OffsetDateTimeAdapter {
+    @ToJson
+    fun toJson(value: OffsetDateTime): String {
+        return DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(value)
+    }
+
+    @FromJson
+    fun fromJson(value: String): OffsetDateTime {
+        return OffsetDateTime.parse(value, DateTimeFormatter.ISO_OFFSET_DATE_TIME)
+    }
+
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/PartConfig.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/PartConfig.kt
@ -0,0 +1,11 @@
+package org.openapitools.client.infrastructure
+
+/**
+ * Defines a config object for a given part of a multi-part request.
+ * NOTE: Headers is a Map<String,String> because rfc2616 defines
+ *       multi-valued headers as csv-only.
+ */
+data class PartConfig<T>(
+    val headers: MutableMap<String, String> = mutableMapOf(),
+    val body: T? = null
+)
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/RequestConfig.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/RequestConfig.kt
@ -0,0 +1,17 @@
+package org.openapitools.client.infrastructure
+
+/**
+ * Defines a config object for a given request.
+ * NOTE: This object doesn't include 'body' because it
+ *       allows for caching of the constructed object
+ *       for many request definitions.
+ * NOTE: Headers is a Map<String,String> because rfc2616 defines
+ *       multi-valued headers as csv-only.
+ */
+data class RequestConfig<T>(
+    val method: RequestMethod,
+    val path: String,
+    val headers: MutableMap<String, String> = mutableMapOf(),
+    val query: MutableMap<String, List<String>> = mutableMapOf(),
+    val body: T? = null
+)
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/RequestMethod.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/RequestMethod.kt
@ -0,0 +1,8 @@
+package org.openapitools.client.infrastructure
+
+/**
+ * Provides enumerated HTTP verbs
+ */
+enum class RequestMethod {
+    GET, DELETE, HEAD, OPTIONS, PATCH, POST, PUT
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ResponseExtensions.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/ResponseExtensions.kt
@ -0,0 +1,24 @@
+package org.openapitools.client.infrastructure
+
+import okhttp3.Response
+
+/**
+ * Provides an extension to evaluation whether the response is a 1xx code
+ */
+val Response.isInformational : Boolean get() = this.code in 100..199
+
+/**
+ * Provides an extension to evaluation whether the response is a 3xx code
+ */
+@Suppress("EXTENSION_SHADOWED_BY_MEMBER")
+val Response.isRedirect : Boolean get() = this.code in 300..399
+
+/**
+ * Provides an extension to evaluation whether the response is a 4xx code
+ */
+val Response.isClientError : Boolean get() = this.code in 400..499
+
+/**
+ * Provides an extension to evaluation whether the response is a 5xx (Standard) through 999 (non-standard) code
+ */
+val Response.isServerError : Boolean get() = this.code in 500..999
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/Serializer.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/Serializer.kt
@ -0,0 +1,23 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.Moshi
+import com.squareup.moshi.kotlin.reflect.KotlinJsonAdapterFactory
+
+object Serializer {
+    @JvmStatic
+    val moshiBuilder: Moshi.Builder = Moshi.Builder()
+        .add(OffsetDateTimeAdapter())
+        .add(LocalDateTimeAdapter())
+        .add(LocalDateAdapter())
+        .add(UUIDAdapter())
+        .add(ByteArrayAdapter())
+        .add(URIAdapter())
+        .add(KotlinJsonAdapterFactory())
+        .add(BigDecimalAdapter())
+        .add(BigIntegerAdapter())
+
+    @JvmStatic
+    val moshi: Moshi by lazy {
+        moshiBuilder.build()
+    }
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/URIAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/URIAdapter.kt
@ -0,0 +1,13 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+import java.net.URI
+
+class URIAdapter {
+    @ToJson
+    fun toJson(uri: URI) = uri.toString()
+
+    @FromJson
+    fun fromJson(s: String): URI = URI.create(s)
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/UUIDAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/infrastructure/UUIDAdapter.kt
@ -0,0 +1,13 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+import java.util.UUID
+
+class UUIDAdapter {
+    @ToJson
+    fun toJson(uuid: UUID) = uuid.toString()
+
+    @FromJson
+    fun fromJson(s: String): UUID = UUID.fromString(s)
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/models/Apa.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-okhttp4/src/main/kotlin/org/openapitools/client/models/Apa.kt
@ -0,0 +1,50 @@
+/**
+ * Demo
+ *
+ * No description provided (generated by Openapi Generator https://github.com/openapitools/openapi-generator)
+ *
+ * The version of the OpenAPI document: 1.0.0
+ * 
+ *
+ * Please note:
+ * This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * Do not edit this file manually.
+ */
+
+@file:Suppress(
+    "ArrayInDataClass",
+    "EnumEntryName",
+    "RemoveRedundantQualifierName",
+    "UnusedImport"
+)
+
+package org.openapitools.client.models
+
+
+import com.squareup.moshi.Json
+
+/**
+ * 
+ *
+ * @param i0 
+ * @param n0 
+ * @param i1 
+ * @param n1 
+ */
+
+data class Apa (
+
+    @Json(name = "i0")
+    val i0: kotlin.Int,
+
+    @Json(name = "n0")
+    val n0: java.math.BigDecimal,
+
+    @Json(name = "i1")
+    val i1: kotlin.Int? = null,
+
+    @Json(name = "n1")
+    val n1: java.math.BigDecimal? = null
+
+)
+
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/.openapi-generator-ignore
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/.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
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/.openapi-generator/FILES
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/.openapi-generator/FILES
@ -0,0 +1,23 @@
+README.md
+build.gradle
+docs/Apa.md
+docs/DefaultApi.md
+gradle/wrapper/gradle-wrapper.jar
+gradle/wrapper/gradle-wrapper.properties
+gradlew
+gradlew.bat
+settings.gradle
+src/main/kotlin/org/openapitools/client/apis/DefaultApi.kt
+src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+src/main/kotlin/org/openapitools/client/infrastructure/BigDecimalAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/BigIntegerAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/ByteArrayAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/CollectionFormats.kt
+src/main/kotlin/org/openapitools/client/infrastructure/LocalDateAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/LocalDateTimeAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/OffsetDateTimeAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/ResponseExt.kt
+src/main/kotlin/org/openapitools/client/infrastructure/Serializer.kt
+src/main/kotlin/org/openapitools/client/infrastructure/URIAdapter.kt
+src/main/kotlin/org/openapitools/client/infrastructure/UUIDAdapter.kt
+src/main/kotlin/org/openapitools/client/models/Apa.kt
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/.openapi-generator/VERSION
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/.openapi-generator/VERSION
@ -0,0 +1 @@
+6.0.0-SNAPSHOT
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/README.md
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/README.md
@ -0,0 +1,50 @@
+# org.openapitools.client - Kotlin client library for Demo
+
+## Requires
+
+* Kotlin 1.4.30
+* Gradle 6.8.3
+
+## Build
+
+First, create the gradle wrapper script:
+
+```
+gradle wrapper
+```
+
+Then, run:
+
+```
+./gradlew check assemble
+```
+
+This runs all tests and packages the library.
+
+## Features/Implementation Notes
+
+* Supports JSON inputs/outputs, File inputs, and Form inputs.
+* Supports collection formats for query parameters: csv, tsv, ssv, pipes.
+* Some Kotlin and Java types are fully qualified to avoid conflicts with types defined in OpenAPI definitions.
+* Implementation of ApiClient is intended to reduce method counts, specifically to benefit Android targets.
+
+<a name="documentation-for-api-endpoints"></a>
+## Documentation for API Endpoints
+
+All URIs are relative to *http://localhost*
+
+Class | Method | HTTP request | Description
+------------ | ------------- | ------------- | -------------
+*DefaultApi* | [**test**](docs/DefaultApi.md#test) | **POST** test | Tests default values
+
+
+<a name="documentation-for-models"></a>
+## Documentation for Models
+
+ - [org.openapitools.client.models.Apa](docs/Apa.md)
+
+
+<a name="documentation-for-authorization"></a>
+## Documentation for Authorization
+
+All endpoints do not require authorization.
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/build.gradle
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/build.gradle
@ -0,0 +1,41 @@
+group 'org.openapitools'
+version '1.0.0'
+
+wrapper {
+    gradleVersion = '6.8.3'
+    distributionUrl = "https://services.gradle.org/distributions/gradle-$gradleVersion-all.zip"
+}
+
+buildscript {
+    ext.kotlin_version = '1.5.10'
+    ext.retrofitVersion = '2.9.0'
+
+    repositories {
+        maven { url "https://repo1.maven.org/maven2" }
+    }
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+apply plugin: 'kotlin'
+
+repositories {
+    maven { url "https://repo1.maven.org/maven2" }
+}
+
+test {
+    useJUnitPlatform()
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+    implementation "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
+    implementation "com.squareup.moshi:moshi-kotlin:1.12.0"
+    implementation "com.squareup.moshi:moshi-adapters:1.12.0"
+    implementation "com.squareup.okhttp3:logging-interceptor:4.9.1"
+    implementation "com.squareup.retrofit2:retrofit:$retrofitVersion"
+    implementation "com.squareup.retrofit2:converter-moshi:$retrofitVersion"
+    implementation "com.squareup.retrofit2:converter-scalars:$retrofitVersion"
+    testImplementation "io.kotlintest:kotlintest-runner-junit5:3.4.2"
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/docs/Apa.md
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/docs/Apa.md
@ -0,0 +1,13 @@
+
+# Apa
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**i0** | **kotlin.Int** |  | 
+**n0** | [**java.math.BigDecimal**](java.math.BigDecimal.md) |  | 
+**i1** | **kotlin.Int** |  |  [optional]
+**n1** | [**java.math.BigDecimal**](java.math.BigDecimal.md) |  |  [optional]
+
+
+
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/docs/DefaultApi.md
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/docs/DefaultApi.md
@ -0,0 +1,101 @@
+# DefaultApi
+
+All URIs are relative to *http://localhost*
+
+Method | HTTP request | Description
+------------- | ------------- | -------------
+[**test**](DefaultApi.md#test) | **POST** test | Tests default values
+
+
+
+Tests default values
+
+Tests default values of different parameters
+
+### Example
+```kotlin
+// Import classes:
+//import org.openapitools.client.*
+//import org.openapitools.client.infrastructure.*
+//import org.openapitools.client.models.*
+
+val apiClient = ApiClient()
+val webService = apiClient.createWebservice(DefaultApi::class.java)
+val pi0 : kotlin.Int = 56 // kotlin.Int | 
+val pi1 : kotlin.Int = 56 // kotlin.Int | 
+val pn0 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val pn1 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val qi0 : kotlin.Int = 56 // kotlin.Int | 
+val qi1 : kotlin.Int = 56 // kotlin.Int | 
+val qi2 : kotlin.Int = 56 // kotlin.Int | 
+val qi3 : kotlin.Int = 56 // kotlin.Int | 
+val qn0 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val qn1 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val qn2 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val qn3 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val hi0 : kotlin.Int = 56 // kotlin.Int | 
+val hi1 : kotlin.Int = 56 // kotlin.Int | 
+val hi2 : kotlin.Int = 56 // kotlin.Int | 
+val hi3 : kotlin.Int = 56 // kotlin.Int | 
+val hn0 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val hn1 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val hn2 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val hn3 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val fi0 : kotlin.Int = 56 // kotlin.Int | 
+val fi1 : kotlin.Int = 56 // kotlin.Int | 
+val fi2 : kotlin.Int = 56 // kotlin.Int | 
+val fi3 : kotlin.Int = 56 // kotlin.Int | 
+val fn0 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val fn1 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val fn2 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+val fn3 : java.math.BigDecimal = 8.14 // java.math.BigDecimal | 
+
+webService.test(pi0, pi1, pn0, pn1, qi0, qi1, qi2, qi3, qn0, qn1, qn2, qn3, hi0, hi1, hi2, hi3, hn0, hn1, hn2, hn3, fi0, fi1, fi2, fi3, fn0, fn1, fn2, fn3)
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **pi0** | **kotlin.Int**|  | [default to 10]
+ **pi1** | **kotlin.Int**|  |
+ **pn0** | **java.math.BigDecimal**|  | [default to 10.0]
+ **pn1** | **java.math.BigDecimal**|  |
+ **qi0** | **kotlin.Int**|  | [optional] [default to 10]
+ **qi1** | **kotlin.Int**|  | [default to 71]
+ **qi2** | **kotlin.Int**|  | [optional]
+ **qi3** | **kotlin.Int**|  |
+ **qn0** | **java.math.BigDecimal**|  | [optional] [default to 10.0]
+ **qn1** | **java.math.BigDecimal**|  | [default to 71.0]
+ **qn2** | **java.math.BigDecimal**|  | [optional]
+ **qn3** | **java.math.BigDecimal**|  |
+ **hi0** | **kotlin.Int**|  | [optional] [default to 10]
+ **hi1** | **kotlin.Int**|  | [default to 71]
+ **hi2** | **kotlin.Int**|  | [optional]
+ **hi3** | **kotlin.Int**|  |
+ **hn0** | **java.math.BigDecimal**|  | [optional] [default to 10.0]
+ **hn1** | **java.math.BigDecimal**|  | [default to 71.0]
+ **hn2** | **java.math.BigDecimal**|  | [optional]
+ **hn3** | **java.math.BigDecimal**|  |
+ **fi0** | **kotlin.Int**|  | [optional] [default to 10]
+ **fi1** | **kotlin.Int**|  | [default to 71]
+ **fi2** | **kotlin.Int**|  | [optional]
+ **fi3** | **kotlin.Int**|  |
+ **fn0** | **java.math.BigDecimal**|  | [optional] [default to 10.0]
+ **fn1** | **java.math.BigDecimal**|  | [default to 71.0]
+ **fn2** | **java.math.BigDecimal**|  | [optional]
+ **fn3** | **java.math.BigDecimal**|  |
+
+### Return type
+
+null (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: multipart/form-data
+ - **Accept**: Not defined
+
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/gradle/wrapper/gradle-wrapper.jar
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/gradle/wrapper/gradle-wrapper.jar
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/gradle/wrapper/gradle-wrapper.properties
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/gradle/wrapper/gradle-wrapper.properties
@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.3-all.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/gradlew
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/gradlew
@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/gradlew.bat
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/gradlew.bat
@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/settings.gradle
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/settings.gradle
@ -0,0 +1,2 @@
+
+rootProject.name = 'kotlin-default-values-jvm-retrofit2'
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/src/main/kotlin/org/openapitools/client/apis/DefaultApi.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/src/main/kotlin/org/openapitools/client/apis/DefaultApi.kt
@ -0,0 +1,50 @@
+package org.openapitools.client.apis
+
+import org.openapitools.client.infrastructure.CollectionFormats.*
+import retrofit2.http.*
+import retrofit2.Call
+import okhttp3.RequestBody
+
+
+interface DefaultApi {
+    /**
+     * Tests default values
+     * Tests default values of different parameters
+     * Responses:
+     *  - 200: Success
+     *
+     * @param pi0  (default to 10)
+     * @param pi1 
+     * @param pn0  (default to 10.0)
+     * @param pn1 
+     * @param qi0  (optional, default to 10)
+     * @param qi1  (default to 71)
+     * @param qi2  (optional)
+     * @param qi3 
+     * @param qn0  (optional, default to 10.0)
+     * @param qn1  (default to 71.0)
+     * @param qn2  (optional)
+     * @param qn3 
+     * @param hi0  (optional, default to 10)
+     * @param hi1  (default to 71)
+     * @param hi2  (optional)
+     * @param hi3 
+     * @param hn0  (optional, default to 10.0)
+     * @param hn1  (default to 71.0)
+     * @param hn2  (optional)
+     * @param hn3 
+     * @param fi0  (optional, default to 10)
+     * @param fi1  (default to 71)
+     * @param fi2  (optional)
+     * @param fi3 
+     * @param fn0  (optional, default to 10.0)
+     * @param fn1  (default to 71.0)
+     * @param fn2  (optional)
+     * @param fn3 
+     * @return [Call]<[Unit]>
+     */
+    @Multipart
+    @POST("test")
+    fun test(@Path("pi0") pi0: kotlin.Int = 10, @Path("pi1") pi1: kotlin.Int, @Path("pn0") pn0: java.math.BigDecimal = java.math.BigDecimal("10.0"), @Path("pn1") pn1: java.math.BigDecimal, @Query("qi0") qi0: kotlin.Int? = 10, @Query("qi1") qi1: kotlin.Int = 71, @Query("qi2") qi2: kotlin.Int? = null, @Query("qi3") qi3: kotlin.Int, @Query("qn0") qn0: java.math.BigDecimal? = java.math.BigDecimal("10.0"), @Query("qn1") qn1: java.math.BigDecimal = java.math.BigDecimal("71.0"), @Query("qn2") qn2: java.math.BigDecimal? = null, @Query("qn3") qn3: java.math.BigDecimal, @Header("hi0") hi0: kotlin.Int? = 10, @Header("hi1") hi1: kotlin.Int = 71, @Header("hi2") hi2: kotlin.Int? = null, @Header("hi3") hi3: kotlin.Int, @Header("hn0") hn0: java.math.BigDecimal? = java.math.BigDecimal("10.0"), @Header("hn1") hn1: java.math.BigDecimal = java.math.BigDecimal("71.0"), @Header("hn2") hn2: java.math.BigDecimal? = null, @Header("hn3") hn3: java.math.BigDecimal, @Part("fi0") fi0: kotlin.Int? = 10, @Part("fi1") fi1: kotlin.Int = 71, @Part("fi2") fi2: kotlin.Int? = null, @Part("fi3") fi3: kotlin.Int, @Part("fn0") fn0: java.math.BigDecimal? = java.math.BigDecimal("10.0"), @Part("fn1") fn1: java.math.BigDecimal = java.math.BigDecimal("71.0"), @Part("fn2") fn2: java.math.BigDecimal? = null, @Part("fn3") fn3: java.math.BigDecimal): Call<Unit>
+
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt
@ -0,0 +1,106 @@
+package org.openapitools.client.infrastructure
+
+
+import okhttp3.Call
+import okhttp3.Interceptor
+import okhttp3.OkHttpClient
+import retrofit2.Retrofit
+import okhttp3.logging.HttpLoggingInterceptor
+import retrofit2.Converter
+import retrofit2.converter.scalars.ScalarsConverterFactory
+import com.squareup.moshi.Moshi
+import retrofit2.converter.moshi.MoshiConverterFactory
+
+
+class ApiClient(
+    private var baseUrl: String = defaultBasePath,
+    private val okHttpClientBuilder: OkHttpClient.Builder? = null,
+    private val serializerBuilder: Moshi.Builder = Serializer.moshiBuilder,
+    private val callFactory : Call.Factory? = null,
+    private val converterFactory: Converter.Factory? = null,
+) {
+    private val apiAuthorizations = mutableMapOf<String, Interceptor>()
+    var logger: ((String) -> Unit)? = null
+
+    private val retrofitBuilder: Retrofit.Builder by lazy {
+        Retrofit.Builder()
+            .baseUrl(baseUrl)
+            .addConverterFactory(ScalarsConverterFactory.create())
+            .addConverterFactory(MoshiConverterFactory.create(serializerBuilder.build()))
+            .apply {
+                if (converterFactory != null) {
+                    addConverterFactory(converterFactory)
+                }
+            }
+    }
+
+    private val clientBuilder: OkHttpClient.Builder by lazy {
+        okHttpClientBuilder ?: defaultClientBuilder
+    }
+
+    private val defaultClientBuilder: OkHttpClient.Builder by lazy {
+        OkHttpClient()
+            .newBuilder()
+            .addInterceptor(HttpLoggingInterceptor(object : HttpLoggingInterceptor.Logger {
+                override fun log(message: String) {
+                    logger?.invoke(message)
+                }
+            }).apply {
+                level = HttpLoggingInterceptor.Level.BODY
+            })
+    }
+
+    init {
+        normalizeBaseUrl()
+    }
+
+    /**
+     * Adds an authorization to be used by the client
+     * @param authName Authentication name
+     * @param authorization Authorization interceptor
+     * @return ApiClient
+     */
+    fun addAuthorization(authName: String, authorization: Interceptor): ApiClient {
+        if (apiAuthorizations.containsKey(authName)) {
+            throw RuntimeException("auth name $authName already in api authorizations")
+        }
+        apiAuthorizations[authName] = authorization
+        clientBuilder.addInterceptor(authorization)
+        return this
+    }
+
+    fun setLogger(logger: (String) -> Unit): ApiClient {
+        this.logger = logger
+        return this
+    }
+
+    fun <S> createService(serviceClass: Class<S>): S {
+        val usedCallFactory = this.callFactory ?: clientBuilder.build()
+        return retrofitBuilder.callFactory(usedCallFactory).build().create(serviceClass)
+    }
+
+    private fun normalizeBaseUrl() {
+        if (!baseUrl.endsWith("/")) {
+            baseUrl += "/"
+        }
+    }
+
+    private inline fun <T, reified U> Iterable<T>.runOnFirst(callback: U.() -> Unit) {
+        for (element in this) {
+            if (element is U)  {
+                callback.invoke(element)
+                break
+            }
+        }
+    }
+
+    companion object {
+        @JvmStatic
+        protected val baseUrlKey = "org.openapitools.client.baseUrl"
+
+        @JvmStatic
+        val defaultBasePath: String by lazy {
+            System.getProperties().getProperty(baseUrlKey, "http://localhost")
+        }
+    }
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/src/main/kotlin/org/openapitools/client/infrastructure/BigDecimalAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/src/main/kotlin/org/openapitools/client/infrastructure/BigDecimalAdapter.kt
@ -0,0 +1,17 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+import java.math.BigDecimal
+
+class BigDecimalAdapter {
+    @ToJson
+    fun toJson(value: BigDecimal): String {
+        return value.toPlainString()
+    }
+
+    @FromJson
+    fun fromJson(value: String): BigDecimal {
+        return BigDecimal(value)
+    }
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/src/main/kotlin/org/openapitools/client/infrastructure/BigIntegerAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/src/main/kotlin/org/openapitools/client/infrastructure/BigIntegerAdapter.kt
@ -0,0 +1,17 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+import java.math.BigInteger
+
+class BigIntegerAdapter {
+    @ToJson
+    fun toJson(value: BigInteger): String {
+        return value.toString()
+    }
+
+    @FromJson
+    fun fromJson(value: String): BigInteger {
+        return BigInteger(value)
+    }
+}
--- a/samples/client/petstore/kotlin-default-values-jvm-retrofit2/src/main/kotlin/org/openapitools/client/infrastructure/ByteArrayAdapter.kt
+++ b/samples/client/petstore/kotlin-default-values-jvm-retrofit2/src/main/kotlin/org/openapitools/client/infrastructure/ByteArrayAdapter.kt
@ -0,0 +1,12 @@
+package org.openapitools.client.infrastructure
+
+import com.squareup.moshi.FromJson
+import com.squareup.moshi.ToJson
+
+class ByteArrayAdapter {
+    @ToJson
+    fun toJson(data: ByteArray): String = String(data)
+
+    @FromJson
+    fun fromJson(data: String): ByteArray = data.toByteArray()
+}
--- a/Show More
+++ b/Show More
				`@ -0,0 +1,2 @@`

				`rootProject.name = 'kotlin-default-values-jvm-okhttp3'`