[Kotlin] update ApiClient to register all adapters for GsonBuilder (#18965)

* update api client to register type adapter

* update samples

* remove json array variable name

modules/openapi-generator/src/main/resources/kotlin-client/data_class.mustache

@@ -163,6 +163,7 @@ import {{packageName}}.infrastructure.ITransformForStorage
 {{/vars}}
 {{/hasEnums}}
 {{#generateOneOfAnyOfWrappers}}
+    {{#gson}}
 
     class CustomTypeAdapterFactory : TypeAdapterFactory {
         override fun <T> create(gson: Gson, type: TypeToken<T>): TypeAdapter<T>? {
@@ -249,24 +250,22 @@ import {{packageName}}.infrastructure.ITransformForStorage
               throw IllegalArgumentException(String.format("Expected the field `{{{baseName}}}` to be an array in the JSON string but got `%s`", jsonObj["{{{baseName}}}"].toString()))
             }
       
-            val jsonArray{{name}} = jsonObj.getAsJsonArray("{{{baseName}}}")
             // validate the required field `{{{baseName}}}` (array)
-            for (i in 0 until jsonArray{{name}}.size()) {
-              {{{items.dataType}}}.validateJsonElement(jsonArray{{name}}.get(i))
+            for (i in 0 until jsonObj.getAsJsonArray("{{{baseName}}}").size()) {
+              {{{items.dataType}}}.validateJsonElement(jsonObj.getAsJsonArray("{{{baseName}}}").get(i))
             }
             {{/required}}
             {{^required}}
             if (jsonObj["{{{baseName}}}"] != null && !jsonObj["{{{baseName}}}"].isJsonNull) {
-              val jsonArray{{name}} = jsonObj.getAsJsonArray("{{{baseName}}}")
-              if (jsonArray{{name}} != null) {
+              if (jsonObj.getAsJsonArray("{{{baseName}}}") != null) {
                 // ensure the json data is an array
                 require(jsonObj["{{{baseName}}}"].isJsonArray) {
                   String.format("Expected the field `{{{baseName}}}` to be an array in the JSON string but got `%s`", jsonObj["{{{baseName}}}"].toString())
                 }
       
                 // validate the optional field `{{{baseName}}}` (array)
-                for (i in 0 until jsonArray{{name}}.size()) {
-                  {{{items.dataType}}}.validateJsonElement(jsonArray{{name}}[i])
+                for (i in 0 until jsonObj.getAsJsonArray("{{{baseName}}}").size()) {
+                  {{{items.dataType}}}.validateJsonElement(jsonObj.getAsJsonArray("{{{baseName}}}").get(i))
                 }
               }
             }
@@ -356,6 +355,7 @@ import {{packageName}}.infrastructure.ITransformForStorage
             {{/discriminator}}
         }
     }
+    {{/gson}}
 {{/generateOneOfAnyOfWrappers}}
 
 {{#vendorExtensions.x-has-data-class-body}}

modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-retrofit2/infrastructure/ApiClient.kt.mustache

@@ -64,9 +64,9 @@ import okhttp3.MediaType.Companion.toMediaType
     private var baseUrl: String = defaultBasePath,
     private val okHttpClientBuilder: OkHttpClient.Builder? = null,
     {{^kotlinx_serialization}}
-    private val serializerBuilder: {{#gson}}GsonBuilder{{/gson}}{{#moshi}}Moshi.Builder{{/moshi}}{{#jackson}}ObjectMapper{{/jackson}} = Serializer.{{#gson}}gsonBuilder{{/gson}}{{#moshi}}moshiBuilder{{/moshi}}{{#jackson}}jacksonObjectMapper{{/jackson}},
+    private val serializerBuilder: {{#gson}}GsonBuilder{{/gson}}{{#moshi}}Moshi.Builder{{/moshi}}{{#jackson}}ObjectMapper{{/jackson}} = {{#generateOneOfAnyOfWrappers}}{{#gson}}registerTypeAdapterFactoryForAllModels({{/gson}}{{/generateOneOfAnyOfWrappers}}Serializer.{{#gson}}gsonBuilder{{/gson}}{{#generateOneOfAnyOfWrappers}}{{#gson}}){{/gson}}{{/generateOneOfAnyOfWrappers}}{{#moshi}}moshiBuilder{{/moshi}}{{#jackson}}jacksonObjectMapper{{/jackson}},
     {{/kotlinx_serialization}}
-    private val callFactory : Call.Factory? = null,
+    private val callFactory: Call.Factory? = null,
     private val callAdapterFactories: List<CallAdapter.Factory> = listOf(
         {{#useRxJava}}
         RxJavaCallAdapterFactory.create(),
@@ -148,7 +148,7 @@ import okhttp3.MediaType.Companion.toMediaType
                 addAuthorization(authName, auth)
             }
         }
-	{{#generateOneOfAnyOfWrappers}}
+        {{#generateOneOfAnyOfWrappers}}
         {{^kotlinx_serialization}}
         {{#gson}}
         {{#models}}
@@ -162,7 +162,7 @@ import okhttp3.MediaType.Companion.toMediaType
         {{/models}}
         {{/gson}}
         {{/kotlinx_serialization}}
-	{{/generateOneOfAnyOfWrappers}}
+        {{/generateOneOfAnyOfWrappers}}
     }
 
     {{#authMethods}}
@@ -177,21 +177,6 @@ import okhttp3.MediaType.Companion.toMediaType
         password: String
     ) : this(baseUrl, okHttpClientBuilder, {{^kotlinx_serialization}}serializerBuilder, {{/kotlinx_serialization}}arrayOf(authName)) {
         setCredentials(username, password)
-	{{#generateOneOfAnyOfWrappers}}
-        {{^kotlinx_serialization}}
-        {{#gson}}
-        {{#models}}
-        {{#model}}
-        {{^isEnum}}
-        {{^hasChildren}}
-        serializerBuilder.registerTypeAdapterFactory({{modelPackage}}.{{{classname}}}.CustomTypeAdapterFactory())
-        {{/hasChildren}}
-        {{/isEnum}}
-        {{/model}}
-        {{/models}}
-        {{/gson}}
-        {{/kotlinx_serialization}}
-	{{/generateOneOfAnyOfWrappers}}
     }
 
     {{/isBasicBasic}}
@@ -204,21 +189,6 @@ import okhttp3.MediaType.Companion.toMediaType
         bearerToken: String
     ) : this(baseUrl, okHttpClientBuilder, {{^kotlinx_serialization}}serializerBuilder, {{/kotlinx_serialization}}arrayOf(authName)) {
         setBearerToken(bearerToken)
-	{{#generateOneOfAnyOfWrappers}}
-        {{^kotlinx_serialization}}
-        {{#gson}}
-        {{#models}}
-        {{#model}}
-        {{^isEnum}}
-        {{^hasChildren}}
-        serializerBuilder.registerTypeAdapterFactory({{modelPackage}}.{{{classname}}}.CustomTypeAdapterFactory())
-        {{/hasChildren}}
-        {{/isEnum}}
-        {{/model}}
-        {{/models}}
-        {{/gson}}
-        {{/kotlinx_serialization}}
-	{{/generateOneOfAnyOfWrappers}}
     }
 
     {{/isBasicBearer}}
@@ -240,21 +210,6 @@ import okhttp3.MediaType.Companion.toMediaType
             ?.setClientSecret(secret)
             ?.setUsername(username)
             ?.setPassword(password)
-	{{#generateOneOfAnyOfWrappers}}
-        {{^kotlinx_serialization}}
-        {{#gson}}
-        {{#models}}
-        {{#model}}
-        {{^isEnum}}
-        {{^hasChildren}}
-        serializerBuilder.registerTypeAdapterFactory({{modelPackage}}.{{{classname}}}.CustomTypeAdapterFactory())
-        {{/hasChildren}}
-        {{/isEnum}}
-        {{/model}}
-        {{/models}}
-        {{/gson}}
-        {{/kotlinx_serialization}}
-	{{/generateOneOfAnyOfWrappers}}
     }
 
     {{/hasOAuthMethods}}
@@ -298,9 +253,9 @@ import okhttp3.MediaType.Companion.toMediaType
     {{/hasAuthMethods}}
     {{#hasOAuthMethods}}
     /**
-    * Helper method to configure the token endpoint of the first oauth found in the apiAuthorizations (there should be only one)
-    * @return Token request builder
-    */
+     * Helper method to configure the token endpoint of the first oauth found in the apiAuthorizations (there should be only one)
+     * @return Token request builder
+     */
     fun getTokenEndPoint(): TokenRequestBuilder? {
         var result: TokenRequestBuilder? = null
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
@@ -310,9 +265,9 @@ import okhttp3.MediaType.Companion.toMediaType
     }
 
     /**
-    * Helper method to configure authorization endpoint of the first oauth found in the apiAuthorizations (there should be only one)
-    * @return Authentication request builder
-    */
+     * Helper method to configure authorization endpoint of the first oauth found in the apiAuthorizations (there should be only one)
+     * @return Authentication request builder
+     */
     fun getAuthorizationEndPoint(): AuthenticationRequestBuilder? {
         var result: AuthenticationRequestBuilder? = null
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
@@ -322,10 +277,10 @@ import okhttp3.MediaType.Companion.toMediaType
     }
 
     /**
-    * Helper method to pre-set the oauth access token of the first oauth found in the apiAuthorizations (there should be only one)
-    * @param accessToken Access token
-    * @return ApiClient
-    */
+     * Helper method to pre-set the oauth access token of the first oauth found in the apiAuthorizations (there should be only one)
+     * @param accessToken Access token
+     * @return ApiClient
+     */
     fun setAccessToken(accessToken: String): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             setAccessToken(accessToken)
@@ -334,12 +289,12 @@ import okhttp3.MediaType.Companion.toMediaType
     }
 
     /**
-    * Helper method to configure the oauth accessCode/implicit flow parameters
-    * @param clientId Client ID
-    * @param clientSecret Client secret
-    * @param redirectURI Redirect URI
-    * @return ApiClient
-    */
+     * Helper method to configure the oauth accessCode/implicit flow parameters
+     * @param clientId Client ID
+     * @param clientSecret Client secret
+     * @param redirectURI Redirect URI
+     * @return ApiClient
+     */
     fun configureAuthorizationFlow(clientId: String, clientSecret: String, redirectURI: String): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             tokenRequestBuilder
@@ -354,10 +309,10 @@ import okhttp3.MediaType.Companion.toMediaType
     }
 
     /**
-    * Configures a listener which is notified when a new access token is received.
-    * @param accessTokenListener Access token listener
-    * @return ApiClient
-    */
+     * Configures a listener which is notified when a new access token is received.
+     * @param accessTokenListener Access token listener
+     * @return ApiClient
+     */
     fun registerAccessTokenListener(accessTokenListener: AccessTokenListener): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             registerAccessTokenListener(accessTokenListener)
@@ -391,6 +346,20 @@ import okhttp3.MediaType.Companion.toMediaType
         return retrofitBuilder.callFactory(usedCallFactory).build().create(serviceClass)
     }
 
+    {{#generateOneOfAnyOfWrappers}}
+    {{^kotlinx_serialization}}
+    {{#gson}}
+    /**
+     * Gets the serializer builder.
+     * @return serial builder
+     */
+    fun getSerializerBuilder(): GsonBuilder {
+        return serializerBuilder
+    }
+
+    {{/gson}}
+    {{/kotlinx_serialization}}
+    {{/generateOneOfAnyOfWrappers}}
     private fun normalizeBaseUrl() {
         if (!baseUrl.endsWith("/")) {
             baseUrl += "/"
@@ -399,7 +368,7 @@ import okhttp3.MediaType.Companion.toMediaType
 
     private inline fun <T, reified U> Iterable<T>.runOnFirst(callback: U.() -> Unit) {
         for (element in this) {
-            if (element is U)  {
+            if (element is U) {
                 callback.invoke(element)
                 break
             }
@@ -416,3 +385,28 @@ import okhttp3.MediaType.Companion.toMediaType
         }
     }
 }
+{{#generateOneOfAnyOfWrappers}}
+{{^kotlinx_serialization}}
+{{#gson}}
+
+/**
+ * Registers all models with the type adapter factory.
+ *
+ * @param gsonBuilder gson builder
+ * @return GSON builder
+ */
+fun registerTypeAdapterFactoryForAllModels(gsonBuilder: GsonBuilder): GsonBuilder {
+    {{#models}}
+    {{#model}}
+    {{^isEnum}}
+    {{^hasChildren}}
+    gsonBuilder.registerTypeAdapterFactory({{modelPackage}}.{{{classname}}}.CustomTypeAdapterFactory())
+    {{/hasChildren}}
+    {{/isEnum}}
+    {{/model}}
+    {{/models}}
+    return gsonBuilder
+}
+{{/gson}}
+{{/kotlinx_serialization}}
+{{/generateOneOfAnyOfWrappers}}

samples/client/echo_api/kotlin-model-prefix-type-mappings/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt

@@ -20,7 +20,7 @@ class ApiClient(
     private var baseUrl: String = defaultBasePath,
     private val okHttpClientBuilder: OkHttpClient.Builder? = null,
     private val serializerBuilder: GsonBuilder = Serializer.gsonBuilder,
-    private val callFactory : Call.Factory? = null,
+    private val callFactory: Call.Factory? = null,
     private val callAdapterFactories: List<CallAdapter.Factory> = listOf(
     ),
     private val converterFactories: List<Converter.Factory> = listOf(
@@ -150,7 +150,7 @@ class ApiClient(
 
     private inline fun <T, reified U> Iterable<T>.runOnFirst(callback: U.() -> Unit) {
         for (element in this) {
-            if (element is U)  {
+            if (element is U) {
                 callback.invoke(element)
                 break
             }

samples/client/petstore/kotlin-default-values-jvm-retrofit2/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt

@@ -17,7 +17,7 @@ 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 callFactory: Call.Factory? = null,
     private val callAdapterFactories: List<CallAdapter.Factory> = listOf(
     ),
     private val converterFactories: List<Converter.Factory> = listOf(
@@ -92,7 +92,7 @@ class ApiClient(
 
     private inline fun <T, reified U> Iterable<T>.runOnFirst(callback: U.() -> Unit) {
         for (element in this) {
-            if (element is U)  {
+            if (element is U) {
                 callback.invoke(element)
                 break
             }

samples/client/petstore/kotlin-jvm-jackson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt

@@ -23,7 +23,7 @@ class ApiClient(
     private var baseUrl: String = defaultBasePath,
     private val okHttpClientBuilder: OkHttpClient.Builder? = null,
     private val serializerBuilder: ObjectMapper = Serializer.jacksonObjectMapper,
-    private val callFactory : Call.Factory? = null,
+    private val callFactory: Call.Factory? = null,
     private val callAdapterFactories: List<CallAdapter.Factory> = listOf(
     ),
     private val converterFactories: List<Converter.Factory> = listOf(
@@ -103,9 +103,9 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure the token endpoint of the first oauth found in the apiAuthorizations (there should be only one)
-    * @return Token request builder
-    */
+     * Helper method to configure the token endpoint of the first oauth found in the apiAuthorizations (there should be only one)
+     * @return Token request builder
+     */
     fun getTokenEndPoint(): TokenRequestBuilder? {
         var result: TokenRequestBuilder? = null
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
@@ -115,9 +115,9 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure authorization endpoint of the first oauth found in the apiAuthorizations (there should be only one)
-    * @return Authentication request builder
-    */
+     * Helper method to configure authorization endpoint of the first oauth found in the apiAuthorizations (there should be only one)
+     * @return Authentication request builder
+     */
     fun getAuthorizationEndPoint(): AuthenticationRequestBuilder? {
         var result: AuthenticationRequestBuilder? = null
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
@@ -127,10 +127,10 @@ class ApiClient(
     }
 
     /**
-    * Helper method to pre-set the oauth access token of the first oauth found in the apiAuthorizations (there should be only one)
-    * @param accessToken Access token
-    * @return ApiClient
-    */
+     * Helper method to pre-set the oauth access token of the first oauth found in the apiAuthorizations (there should be only one)
+     * @param accessToken Access token
+     * @return ApiClient
+     */
     fun setAccessToken(accessToken: String): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             setAccessToken(accessToken)
@@ -139,12 +139,12 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure the oauth accessCode/implicit flow parameters
-    * @param clientId Client ID
-    * @param clientSecret Client secret
-    * @param redirectURI Redirect URI
-    * @return ApiClient
-    */
+     * Helper method to configure the oauth accessCode/implicit flow parameters
+     * @param clientId Client ID
+     * @param clientSecret Client secret
+     * @param redirectURI Redirect URI
+     * @return ApiClient
+     */
     fun configureAuthorizationFlow(clientId: String, clientSecret: String, redirectURI: String): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             tokenRequestBuilder
@@ -159,10 +159,10 @@ class ApiClient(
     }
 
     /**
-    * Configures a listener which is notified when a new access token is received.
-    * @param accessTokenListener Access token listener
-    * @return ApiClient
-    */
+     * Configures a listener which is notified when a new access token is received.
+     * @param accessTokenListener Access token listener
+     * @return ApiClient
+     */
     fun registerAccessTokenListener(accessTokenListener: AccessTokenListener): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             registerAccessTokenListener(accessTokenListener)
@@ -203,7 +203,7 @@ class ApiClient(
 
     private inline fun <T, reified U> Iterable<T>.runOnFirst(callback: U.() -> Unit) {
         for (element in this) {
-            if (element is U)  {
+            if (element is U) {
                 callback.invoke(element)
                 break
             }

samples/client/petstore/kotlin-model-prefix-type-mappings/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt

@@ -23,8 +23,8 @@ import retrofit2.converter.gson.GsonConverterFactory
 class ApiClient(
     private var baseUrl: String = defaultBasePath,
     private val okHttpClientBuilder: OkHttpClient.Builder? = null,
-    private val serializerBuilder: GsonBuilder = Serializer.gsonBuilder,
-    private val callFactory : Call.Factory? = null,
+    private val serializerBuilder: GsonBuilder = registerTypeAdapterFactoryForAllModels(Serializer.gsonBuilder),
+    private val callFactory: Call.Factory? = null,
     private val callAdapterFactories: List<CallAdapter.Factory> = listOf(
     ),
     private val converterFactories: List<Converter.Factory> = listOf(
@@ -112,23 +112,12 @@ class ApiClient(
             ?.setClientSecret(secret)
             ?.setUsername(username)
             ?.setPassword(password)
-        serializerBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiAnnotation.CustomTypeAdapterFactory())
-        serializerBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiAnyOfUserOrPet.CustomTypeAdapterFactory())
-        serializerBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiAnyOfUserOrPetOrArrayString.CustomTypeAdapterFactory())
-        serializerBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiApiResponse.CustomTypeAdapterFactory())
-        serializerBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiCategory.CustomTypeAdapterFactory())
-        serializerBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiOrder.CustomTypeAdapterFactory())
-        serializerBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiPet.CustomTypeAdapterFactory())
-        serializerBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiTag.CustomTypeAdapterFactory())
-        serializerBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiUser.CustomTypeAdapterFactory())
-        serializerBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiUserOrPet.CustomTypeAdapterFactory())
-        serializerBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiUserOrPetOrArrayString.CustomTypeAdapterFactory())
     }
 
     /**
-    * Helper method to configure the token endpoint of the first oauth found in the apiAuthorizations (there should be only one)
-    * @return Token request builder
-    */
+     * Helper method to configure the token endpoint of the first oauth found in the apiAuthorizations (there should be only one)
+     * @return Token request builder
+     */
     fun getTokenEndPoint(): TokenRequestBuilder? {
         var result: TokenRequestBuilder? = null
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
@@ -138,9 +127,9 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure authorization endpoint of the first oauth found in the apiAuthorizations (there should be only one)
-    * @return Authentication request builder
-    */
+     * Helper method to configure authorization endpoint of the first oauth found in the apiAuthorizations (there should be only one)
+     * @return Authentication request builder
+     */
     fun getAuthorizationEndPoint(): AuthenticationRequestBuilder? {
         var result: AuthenticationRequestBuilder? = null
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
@@ -150,10 +139,10 @@ class ApiClient(
     }
 
     /**
-    * Helper method to pre-set the oauth access token of the first oauth found in the apiAuthorizations (there should be only one)
-    * @param accessToken Access token
-    * @return ApiClient
-    */
+     * Helper method to pre-set the oauth access token of the first oauth found in the apiAuthorizations (there should be only one)
+     * @param accessToken Access token
+     * @return ApiClient
+     */
     fun setAccessToken(accessToken: String): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             setAccessToken(accessToken)
@@ -162,12 +151,12 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure the oauth accessCode/implicit flow parameters
-    * @param clientId Client ID
-    * @param clientSecret Client secret
-    * @param redirectURI Redirect URI
-    * @return ApiClient
-    */
+     * Helper method to configure the oauth accessCode/implicit flow parameters
+     * @param clientId Client ID
+     * @param clientSecret Client secret
+     * @param redirectURI Redirect URI
+     * @return ApiClient
+     */
     fun configureAuthorizationFlow(clientId: String, clientSecret: String, redirectURI: String): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             tokenRequestBuilder
@@ -182,10 +171,10 @@ class ApiClient(
     }
 
     /**
-    * Configures a listener which is notified when a new access token is received.
-    * @param accessTokenListener Access token listener
-    * @return ApiClient
-    */
+     * Configures a listener which is notified when a new access token is received.
+     * @param accessTokenListener Access token listener
+     * @return ApiClient
+     */
     fun registerAccessTokenListener(accessTokenListener: AccessTokenListener): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             registerAccessTokenListener(accessTokenListener)
@@ -218,6 +207,14 @@ class ApiClient(
         return retrofitBuilder.callFactory(usedCallFactory).build().create(serviceClass)
     }
 
+    /**
+     * Gets the serializer builder.
+     * @return serial builder
+     */
+    fun getSerializerBuilder(): GsonBuilder {
+        return serializerBuilder
+    }
+
     private fun normalizeBaseUrl() {
         if (!baseUrl.endsWith("/")) {
             baseUrl += "/"
@@ -226,7 +223,7 @@ class ApiClient(
 
     private inline fun <T, reified U> Iterable<T>.runOnFirst(callback: U.() -> Unit) {
         for (element in this) {
-            if (element is U)  {
+            if (element is U) {
                 callback.invoke(element)
                 break
             }
@@ -243,3 +240,24 @@ class ApiClient(
         }
     }
 }
+
+/**
+ * Registers all models with the type adapter factory.
+ *
+ * @param gsonBuilder gson builder
+ * @return GSON builder
+ */
+fun registerTypeAdapterFactoryForAllModels(gsonBuilder: GsonBuilder): GsonBuilder {
+    gsonBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiAnnotation.CustomTypeAdapterFactory())
+    gsonBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiAnyOfUserOrPet.CustomTypeAdapterFactory())
+    gsonBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiAnyOfUserOrPetOrArrayString.CustomTypeAdapterFactory())
+    gsonBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiApiResponse.CustomTypeAdapterFactory())
+    gsonBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiCategory.CustomTypeAdapterFactory())
+    gsonBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiOrder.CustomTypeAdapterFactory())
+    gsonBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiPet.CustomTypeAdapterFactory())
+    gsonBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiTag.CustomTypeAdapterFactory())
+    gsonBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiUser.CustomTypeAdapterFactory())
+    gsonBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiUserOrPet.CustomTypeAdapterFactory())
+    gsonBuilder.registerTypeAdapterFactory(org.openapitools.client.models.ApiUserOrPetOrArrayString.CustomTypeAdapterFactory())
+    return gsonBuilder
+}

samples/client/petstore/kotlin-model-prefix-type-mappings/src/main/kotlin/org/openapitools/client/models/ApiPet.kt

@@ -156,16 +156,15 @@ data class ApiPet (
               ApiCategory.validateJsonElement(jsonObj["category"])
             }
             if (jsonObj["tags"] != null && !jsonObj["tags"].isJsonNull) {
-              val jsonArraytags = jsonObj.getAsJsonArray("tags")
-              if (jsonArraytags != null) {
+              if (jsonObj.getAsJsonArray("tags") != null) {
                 // ensure the json data is an array
                 require(jsonObj["tags"].isJsonArray) {
                   String.format("Expected the field `tags` to be an array in the JSON string but got `%s`", jsonObj["tags"].toString())
                 }
       
                 // validate the optional field `tags` (array)
-                for (i in 0 until jsonArraytags.size()) {
-                  ApiTag.validateJsonElement(jsonArraytags[i])
+                for (i in 0 until jsonObj.getAsJsonArray("tags").size()) {
+                  ApiTag.validateJsonElement(jsonObj.getAsJsonArray("tags").get(i))
                 }
               }
             }

samples/client/petstore/kotlin-model-prefix-type-mappings/src/test/kotlin/org/openapitools/client/models/UserOrPetTest.kt

@@ -27,6 +27,8 @@ import com.google.gson.GsonBuilder
 import io.kotlintest.matchers.types.shouldBeSameInstanceAs
 import io.kotlintest.shouldNotBe
 import org.junit.jupiter.api.Assertions.assertThrows
+import org.openapitools.client.infrastructure.ApiClient
+import org.openapitools.client.infrastructure.registerTypeAdapterFactoryForAllModels
 import java.io.IOException
 import java.lang.RuntimeException
 
@@ -34,13 +36,7 @@ class ApiUserOrPetTest : ShouldSpec() {
     init {
 
         should("test custom type adapter") {
-            val gson = GsonBuilder()
-                    .registerTypeAdapterFactory(ApiUser.CustomTypeAdapterFactory())
-                    .registerTypeAdapterFactory(ApiCategory.CustomTypeAdapterFactory())
-                    .registerTypeAdapterFactory(ApiPet.CustomTypeAdapterFactory())
-                    .registerTypeAdapterFactory(ApiTag.CustomTypeAdapterFactory())
-                    .registerTypeAdapterFactory(ApiUserOrPet.CustomTypeAdapterFactory())
-                    .create()
+            val gson = ApiClient().getSerializerBuilder().create()
 
             // test Category
             val categoryJson = "{\"id\":123,\"name\":\"category\"}"

samples/client/petstore/kotlin-retrofit2-jackson/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt

@@ -23,7 +23,7 @@ class ApiClient(
     private var baseUrl: String = defaultBasePath,
     private val okHttpClientBuilder: OkHttpClient.Builder? = null,
     private val serializerBuilder: ObjectMapper = Serializer.jacksonObjectMapper,
-    private val callFactory : Call.Factory? = null,
+    private val callFactory: Call.Factory? = null,
     private val callAdapterFactories: List<CallAdapter.Factory> = listOf(
     ),
     private val converterFactories: List<Converter.Factory> = listOf(
@@ -103,9 +103,9 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure the token endpoint of the first oauth found in the apiAuthorizations (there should be only one)
-    * @return Token request builder
-    */
+     * Helper method to configure the token endpoint of the first oauth found in the apiAuthorizations (there should be only one)
+     * @return Token request builder
+     */
     fun getTokenEndPoint(): TokenRequestBuilder? {
         var result: TokenRequestBuilder? = null
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
@@ -115,9 +115,9 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure authorization endpoint of the first oauth found in the apiAuthorizations (there should be only one)
-    * @return Authentication request builder
-    */
+     * Helper method to configure authorization endpoint of the first oauth found in the apiAuthorizations (there should be only one)
+     * @return Authentication request builder
+     */
     fun getAuthorizationEndPoint(): AuthenticationRequestBuilder? {
         var result: AuthenticationRequestBuilder? = null
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
@@ -127,10 +127,10 @@ class ApiClient(
     }
 
     /**
-    * Helper method to pre-set the oauth access token of the first oauth found in the apiAuthorizations (there should be only one)
-    * @param accessToken Access token
-    * @return ApiClient
-    */
+     * Helper method to pre-set the oauth access token of the first oauth found in the apiAuthorizations (there should be only one)
+     * @param accessToken Access token
+     * @return ApiClient
+     */
     fun setAccessToken(accessToken: String): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             setAccessToken(accessToken)
@@ -139,12 +139,12 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure the oauth accessCode/implicit flow parameters
-    * @param clientId Client ID
-    * @param clientSecret Client secret
-    * @param redirectURI Redirect URI
-    * @return ApiClient
-    */
+     * Helper method to configure the oauth accessCode/implicit flow parameters
+     * @param clientId Client ID
+     * @param clientSecret Client secret
+     * @param redirectURI Redirect URI
+     * @return ApiClient
+     */
     fun configureAuthorizationFlow(clientId: String, clientSecret: String, redirectURI: String): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             tokenRequestBuilder
@@ -159,10 +159,10 @@ class ApiClient(
     }
 
     /**
-    * Configures a listener which is notified when a new access token is received.
-    * @param accessTokenListener Access token listener
-    * @return ApiClient
-    */
+     * Configures a listener which is notified when a new access token is received.
+     * @param accessTokenListener Access token listener
+     * @return ApiClient
+     */
     fun registerAccessTokenListener(accessTokenListener: AccessTokenListener): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             registerAccessTokenListener(accessTokenListener)
@@ -203,7 +203,7 @@ class ApiClient(
 
     private inline fun <T, reified U> Iterable<T>.runOnFirst(callback: U.() -> Unit) {
         for (element in this) {
-            if (element is U)  {
+            if (element is U) {
                 callback.invoke(element)
                 break
             }

samples/client/petstore/kotlin-retrofit2-kotlinx_serialization/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt

@@ -23,7 +23,7 @@ import okhttp3.MediaType.Companion.toMediaType
 class ApiClient(
     private var baseUrl: String = defaultBasePath,
     private val okHttpClientBuilder: OkHttpClient.Builder? = null,
-    private val callFactory : Call.Factory? = null,
+    private val callFactory: Call.Factory? = null,
     private val callAdapterFactories: List<CallAdapter.Factory> = listOf(
     ),
     private val converterFactories: List<Converter.Factory> = listOf(
@@ -103,9 +103,9 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure the token endpoint of the first oauth found in the apiAuthorizations (there should be only one)
-    * @return Token request builder
-    */
+     * Helper method to configure the token endpoint of the first oauth found in the apiAuthorizations (there should be only one)
+     * @return Token request builder
+     */
     fun getTokenEndPoint(): TokenRequestBuilder? {
         var result: TokenRequestBuilder? = null
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
@@ -115,9 +115,9 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure authorization endpoint of the first oauth found in the apiAuthorizations (there should be only one)
-    * @return Authentication request builder
-    */
+     * Helper method to configure authorization endpoint of the first oauth found in the apiAuthorizations (there should be only one)
+     * @return Authentication request builder
+     */
     fun getAuthorizationEndPoint(): AuthenticationRequestBuilder? {
         var result: AuthenticationRequestBuilder? = null
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
@@ -127,10 +127,10 @@ class ApiClient(
     }
 
     /**
-    * Helper method to pre-set the oauth access token of the first oauth found in the apiAuthorizations (there should be only one)
-    * @param accessToken Access token
-    * @return ApiClient
-    */
+     * Helper method to pre-set the oauth access token of the first oauth found in the apiAuthorizations (there should be only one)
+     * @param accessToken Access token
+     * @return ApiClient
+     */
     fun setAccessToken(accessToken: String): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             setAccessToken(accessToken)
@@ -139,12 +139,12 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure the oauth accessCode/implicit flow parameters
-    * @param clientId Client ID
-    * @param clientSecret Client secret
-    * @param redirectURI Redirect URI
-    * @return ApiClient
-    */
+     * Helper method to configure the oauth accessCode/implicit flow parameters
+     * @param clientId Client ID
+     * @param clientSecret Client secret
+     * @param redirectURI Redirect URI
+     * @return ApiClient
+     */
     fun configureAuthorizationFlow(clientId: String, clientSecret: String, redirectURI: String): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             tokenRequestBuilder
@@ -159,10 +159,10 @@ class ApiClient(
     }
 
     /**
-    * Configures a listener which is notified when a new access token is received.
-    * @param accessTokenListener Access token listener
-    * @return ApiClient
-    */
+     * Configures a listener which is notified when a new access token is received.
+     * @param accessTokenListener Access token listener
+     * @return ApiClient
+     */
     fun registerAccessTokenListener(accessTokenListener: AccessTokenListener): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             registerAccessTokenListener(accessTokenListener)
@@ -203,7 +203,7 @@ class ApiClient(
 
     private inline fun <T, reified U> Iterable<T>.runOnFirst(callback: U.() -> Unit) {
         for (element in this) {
-            if (element is U)  {
+            if (element is U) {
                 callback.invoke(element)
                 break
             }

samples/client/petstore/kotlin-retrofit2-rx3/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt

@@ -24,7 +24,7 @@ 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 callFactory: Call.Factory? = null,
     private val callAdapterFactories: List<CallAdapter.Factory> = listOf(
         RxJava3CallAdapterFactory.create(),
     ),
@@ -105,9 +105,9 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure the token endpoint of the first oauth found in the apiAuthorizations (there should be only one)
-    * @return Token request builder
-    */
+     * Helper method to configure the token endpoint of the first oauth found in the apiAuthorizations (there should be only one)
+     * @return Token request builder
+     */
     fun getTokenEndPoint(): TokenRequestBuilder? {
         var result: TokenRequestBuilder? = null
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
@@ -117,9 +117,9 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure authorization endpoint of the first oauth found in the apiAuthorizations (there should be only one)
-    * @return Authentication request builder
-    */
+     * Helper method to configure authorization endpoint of the first oauth found in the apiAuthorizations (there should be only one)
+     * @return Authentication request builder
+     */
     fun getAuthorizationEndPoint(): AuthenticationRequestBuilder? {
         var result: AuthenticationRequestBuilder? = null
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
@@ -129,10 +129,10 @@ class ApiClient(
     }
 
     /**
-    * Helper method to pre-set the oauth access token of the first oauth found in the apiAuthorizations (there should be only one)
-    * @param accessToken Access token
-    * @return ApiClient
-    */
+     * Helper method to pre-set the oauth access token of the first oauth found in the apiAuthorizations (there should be only one)
+     * @param accessToken Access token
+     * @return ApiClient
+     */
     fun setAccessToken(accessToken: String): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             setAccessToken(accessToken)
@@ -141,12 +141,12 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure the oauth accessCode/implicit flow parameters
-    * @param clientId Client ID
-    * @param clientSecret Client secret
-    * @param redirectURI Redirect URI
-    * @return ApiClient
-    */
+     * Helper method to configure the oauth accessCode/implicit flow parameters
+     * @param clientId Client ID
+     * @param clientSecret Client secret
+     * @param redirectURI Redirect URI
+     * @return ApiClient
+     */
     fun configureAuthorizationFlow(clientId: String, clientSecret: String, redirectURI: String): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             tokenRequestBuilder
@@ -161,10 +161,10 @@ class ApiClient(
     }
 
     /**
-    * Configures a listener which is notified when a new access token is received.
-    * @param accessTokenListener Access token listener
-    * @return ApiClient
-    */
+     * Configures a listener which is notified when a new access token is received.
+     * @param accessTokenListener Access token listener
+     * @return ApiClient
+     */
     fun registerAccessTokenListener(accessTokenListener: AccessTokenListener): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             registerAccessTokenListener(accessTokenListener)
@@ -205,7 +205,7 @@ class ApiClient(
 
     private inline fun <T, reified U> Iterable<T>.runOnFirst(callback: U.() -> Unit) {
         for (element in this) {
-            if (element is U)  {
+            if (element is U) {
                 callback.invoke(element)
                 break
             }

samples/client/petstore/kotlin-retrofit2/src/main/kotlin/org/openapitools/client/infrastructure/ApiClient.kt

@@ -23,7 +23,7 @@ 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 callFactory: Call.Factory? = null,
     private val callAdapterFactories: List<CallAdapter.Factory> = listOf(
     ),
     private val converterFactories: List<Converter.Factory> = listOf(
@@ -103,9 +103,9 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure the token endpoint of the first oauth found in the apiAuthorizations (there should be only one)
-    * @return Token request builder
-    */
+     * Helper method to configure the token endpoint of the first oauth found in the apiAuthorizations (there should be only one)
+     * @return Token request builder
+     */
     fun getTokenEndPoint(): TokenRequestBuilder? {
         var result: TokenRequestBuilder? = null
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
@@ -115,9 +115,9 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure authorization endpoint of the first oauth found in the apiAuthorizations (there should be only one)
-    * @return Authentication request builder
-    */
+     * Helper method to configure authorization endpoint of the first oauth found in the apiAuthorizations (there should be only one)
+     * @return Authentication request builder
+     */
     fun getAuthorizationEndPoint(): AuthenticationRequestBuilder? {
         var result: AuthenticationRequestBuilder? = null
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
@@ -127,10 +127,10 @@ class ApiClient(
     }
 
     /**
-    * Helper method to pre-set the oauth access token of the first oauth found in the apiAuthorizations (there should be only one)
-    * @param accessToken Access token
-    * @return ApiClient
-    */
+     * Helper method to pre-set the oauth access token of the first oauth found in the apiAuthorizations (there should be only one)
+     * @param accessToken Access token
+     * @return ApiClient
+     */
     fun setAccessToken(accessToken: String): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             setAccessToken(accessToken)
@@ -139,12 +139,12 @@ class ApiClient(
     }
 
     /**
-    * Helper method to configure the oauth accessCode/implicit flow parameters
-    * @param clientId Client ID
-    * @param clientSecret Client secret
-    * @param redirectURI Redirect URI
-    * @return ApiClient
-    */
+     * Helper method to configure the oauth accessCode/implicit flow parameters
+     * @param clientId Client ID
+     * @param clientSecret Client secret
+     * @param redirectURI Redirect URI
+     * @return ApiClient
+     */
     fun configureAuthorizationFlow(clientId: String, clientSecret: String, redirectURI: String): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             tokenRequestBuilder
@@ -159,10 +159,10 @@ class ApiClient(
     }
 
     /**
-    * Configures a listener which is notified when a new access token is received.
-    * @param accessTokenListener Access token listener
-    * @return ApiClient
-    */
+     * Configures a listener which is notified when a new access token is received.
+     * @param accessTokenListener Access token listener
+     * @return ApiClient
+     */
     fun registerAccessTokenListener(accessTokenListener: AccessTokenListener): ApiClient {
         apiAuthorizations.values.runOnFirst<Interceptor, OAuth> {
             registerAccessTokenListener(accessTokenListener)
@@ -203,7 +203,7 @@ class ApiClient(
 
     private inline fun <T, reified U> Iterable<T>.runOnFirst(callback: U.() -> Unit) {
         for (element in this) {
-            if (element is U)  {
+            if (element is U) {
                 callback.invoke(element)
                 break
             }