fix generated JsonTypeName when using underscore in schema names

Author: BB223

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;
                             }

modules/openapi-generator/src/test/resources/3_0/jaxrs/petstore.yaml

@@ -771,20 +771,20 @@ 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'
         - type: object
           properties:
             indoor:
               type: boolean
-    DogRequest:
+    Dog_Request:
       allOf:
         - $ref: '#/components/schemas/PetRequest'
         - type: object

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;