From 2a556ff24eba029fde48c48e8f36a2dc2aede8a5 Mon Sep 17 00:00:00 2001
From: yzaoui <9062006+yzaoui@users.noreply.github.com>
Date: Fri, 5 Sep 2025 22:17:28 -0400
Subject: [PATCH] Fix missing `@Serializable` on enums for kotlin/jvm-retrofit2
 (#21907)

* Add @Serializable annotation to enum for kotlinx-serialization

* Adjust template, generate samples

* Fix template
---
 .../kotlin-client/libraries/jvm-retrofit2/api.mustache         | 3 ++-
 .../src/main/kotlin/org/openapitools/client/apis/PetApi.kt     | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git 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
index e6ad5f06d19..9cd7ef3fea0 100644
--- 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
@@ -77,7 +77,8 @@ import okhttp3.MultipartBody
     /**
     * enum for parameter {{paramName}}
     */
-    {{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}enum class {{enumName}}{{operationIdCamelCase}}({{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}val value: {{^isContainer}}{{dataType}}{{/isContainer}}{{#isContainer}}kotlin.String{{/isContainer}}) {
+    {{#kotlinx_serialization}}@Serializable
+    {{/kotlinx_serialization}}{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}enum class {{enumName}}{{operationIdCamelCase}}({{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}val value: {{^isContainer}}{{dataType}}{{/isContainer}}{{#isContainer}}kotlin.String{{/isContainer}}) {
     {{^enumUnknownDefaultCase}}
         {{#allowableValues}}
             {{#enumVars}}
diff --git a/samples/client/petstore/kotlin-retrofit2-kotlinx_serialization/src/main/kotlin/org/openapitools/client/apis/PetApi.kt b/samples/client/petstore/kotlin-retrofit2-kotlinx_serialization/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
index 7818bd2d5de..17890ff744d 100644
--- a/samples/client/petstore/kotlin-retrofit2-kotlinx_serialization/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
+++ b/samples/client/petstore/kotlin-retrofit2-kotlinx_serialization/src/main/kotlin/org/openapitools/client/apis/PetApi.kt
@@ -44,6 +44,7 @@ interface PetApi {
     /**
     * enum for parameter status
     */
+    @Serializable
     enum class StatusFindPetsByStatus(val value: kotlin.String) {
         @SerialName(value = "available") AVAILABLE("available"),
         @SerialName(value = "pending") PENDING("pending"),