From dd8957640f941398f70b4fab8877d4d7c5080da8 Mon Sep 17 00:00:00 2001
From: BB223 <79644542+BB223@users.noreply.github.com>
Date: Mon, 4 May 2026 17:33:34 +0200
Subject: [PATCH] fix generated JsonTypeName when using underscore in schema
 names

---
 .../codegen/languages/JavaJAXRSSpecServerCodegen.java       | 2 +-
 .../src/test/resources/3_0/jaxrs/petstore.yaml              | 6 +++---
 .../src/gen/java/org/openapitools/model/DogRequest.java     | 1 +
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaJAXRSSpecServerCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaJAXRSSpecServerCodegen.java
index be03b538e466..9ac2b0927cea 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaJAXRSSpecServerCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaJAXRSSpecServerCodegen.java
@@ -373,7 +373,7 @@ public Map<String, ModelsMap> postProcessAllModels(Map<String, ModelsMap> objs)
                     CodegenDiscriminator discriminator = model.parentModel.getDiscriminator();
                     if (discriminator != null) {
                         for (CodegenDiscriminator.MappedModel mappedModel : discriminator.getMappedModels()) {
-                            if (mappedModel.getModelName().equals(model.name)) {
+                            if (mappedModel.getSchemaName().equals(model.schemaName)) {
                                 model.getVendorExtensions().put("x-discriminator-value", mappedModel.getMappingName());
                                 break;
                             }
diff --git a/modules/openapi-generator/src/test/resources/3_0/jaxrs/petstore.yaml b/modules/openapi-generator/src/test/resources/3_0/jaxrs/petstore.yaml
index 3521572b9203..dc025556747e 100644
--- a/modules/openapi-generator/src/test/resources/3_0/jaxrs/petstore.yaml
+++ b/modules/openapi-generator/src/test/resources/3_0/jaxrs/petstore.yaml
@@ -771,12 +771,12 @@ components:
           type: string
       oneOf:
         - $ref: '#/components/schemas/CatRequest'
-        - $ref: '#/components/schemas/DogRequest'
+        - $ref: '#/components/schemas/Dog_Request'
       discriminator:
         propertyName: petType
         mapping:
           CAT: '#/components/schemas/CatRequest'
-          DOG: '#/components/schemas/DogRequest'
+          DOG: '#/components/schemas/Dog_Request'
     CatRequest:
       allOf:
         - $ref: '#/components/schemas/PetRequest'
@@ -784,7 +784,7 @@ components:
           properties:
             indoor:
               type: boolean
-    DogRequest:
+    Dog_Request:
       allOf:
         - $ref: '#/components/schemas/PetRequest'
         - type: object
diff --git a/samples/server/petstore/jaxrs-cxf-cdi/src/gen/java/org/openapitools/model/DogRequest.java b/samples/server/petstore/jaxrs-cxf-cdi/src/gen/java/org/openapitools/model/DogRequest.java
index f1a23fc558df..8af535a95f57 100644
--- a/samples/server/petstore/jaxrs-cxf-cdi/src/gen/java/org/openapitools/model/DogRequest.java
+++ b/samples/server/petstore/jaxrs-cxf-cdi/src/gen/java/org/openapitools/model/DogRequest.java
@@ -2,6 +2,7 @@
 
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonTypeName;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.PetRequest;