[BUG][JAVA][SPRING] Fix serialization when there is a discriminator with mapping

modules/openapi-generator/src/main/resources/Java/pojo.mustache

@@ -15,7 +15,9 @@
 {{/vars}}
 })
 {{#isClassnameSanitized}}
+{{^hasDiscriminatorWithNonEmptyMapping}}
 @JsonTypeName("{{name}}")
+{{/hasDiscriminatorWithNonEmptyMapping}}
 {{/isClassnameSanitized}}
 {{/jackson}}
 {{>additionalModelTypeAnnotations}}{{>generatedAnnotation}}{{#discriminator}}{{>typeInfoAnnotation}}{{/discriminator}}{{>xmlAnnotation}}

modules/openapi-generator/src/main/resources/JavaSpring/pojo.mustache

@@ -15,7 +15,9 @@
 {{/discriminator}}
 {{#jackson}}
 {{#isClassnameSanitized}}
+{{^hasDiscriminatorWithNonEmptyMapping}}  
 @JsonTypeName("{{name}}")
+{{/hasDiscriminatorWithNonEmptyMapping}}
 {{/isClassnameSanitized}}
 {{/jackson}}
 {{#withXml}}

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/JavaClientCodegenTest.java

@@ -18,6 +18,7 @@
 package org.openapitools.codegen.java;
 
 import com.google.common.collect.ImmutableMap;
+import io.swagger.parser.OpenAPIParser;
 import io.swagger.v3.oas.models.OpenAPI;
 import io.swagger.v3.oas.models.Operation;
 import io.swagger.v3.oas.models.media.ArraySchema;
@@ -30,6 +31,7 @@
 import io.swagger.v3.oas.models.media.StringSchema;
 import io.swagger.v3.oas.models.parameters.RequestBody;
 import io.swagger.v3.oas.models.responses.ApiResponse;
+import io.swagger.v3.parser.core.models.ParseOptions;
 import io.swagger.v3.parser.util.SchemaTypeUtil;
 import org.openapitools.codegen.ClientOptInput;
 import org.openapitools.codegen.CodegenConstants;
@@ -75,6 +77,8 @@
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
+import static org.openapitools.codegen.TestUtils.assertFileContains;
+import static org.openapitools.codegen.TestUtils.assertFileNotContains;
 import static org.openapitools.codegen.TestUtils.validateJavaSourceFiles;
 import static org.testng.Assert.assertEquals;
 import static org.testng.Assert.assertTrue;
@@ -1752,4 +1756,82 @@ public void testJdkHttpClientWithAndWithoutParentExtension() throws Exception {
         TestUtils.assertFileContains(Paths.get(output + "/src/main/java/xyz/abcdef/model/AnotherChild.java"),
                 "public class AnotherChild {");
     }
+
+    @Test
+    public void testDiscriminatorWithMappingIssue14731() throws IOException {
+        File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
+        output.deleteOnExit();
+        String outputPath = output.getAbsolutePath().replace('\\', '/');
+        OpenAPI openAPI = new OpenAPIParser()
+            .readLocation("src/test/resources/bugs/issue_14731.yaml", null, new ParseOptions()).getOpenAPI();
+
+        JavaClientCodegen codegen = new JavaClientCodegen();
+        codegen.setOutputDir(output.getAbsolutePath());
+        codegen.additionalProperties().put(CXFServerFeatures.LOAD_TEST_DATA_FROM_FILE, "true");
+        codegen.setUseOneOfInterfaces(true);
+
+        ClientOptInput input = new ClientOptInput();
+        input.openAPI(openAPI);
+        input.config(codegen);
+
+        DefaultGenerator generator = new DefaultGenerator();
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODELS, "true");
+        generator.setGeneratorPropertyDefault(CodegenConstants.LEGACY_DISCRIMINATOR_BEHAVIOR, "false");
+
+
+        codegen.setUseOneOfInterfaces(true);
+        codegen.setLegacyDiscriminatorBehavior(false);
+        codegen.setUseJakartaEe(true);
+        codegen.setModelNameSuffix("DTO");
+
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_TESTS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_DOCS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.APIS, "true");
+        generator.setGeneratorPropertyDefault(CodegenConstants.SUPPORTING_FILES, "false");
+
+        generator.opts(input).generate();
+
+        assertFileNotContains(Paths.get(outputPath + "/src/main/java/org/openapitools/client/model/ChildWithMappingADTO.java"), "@JsonTypeName");
+        assertFileNotContains(Paths.get(outputPath + "/src/main/java/org/openapitools/client/model/ChildWithMappingBDTO.java"), "@JsonTypeName");
+    }
+
+    @Test
+    public void testDiscriminatorWithoutMappingIssue14731() throws IOException {
+        File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
+        output.deleteOnExit();
+        String outputPath = output.getAbsolutePath().replace('\\', '/');
+        OpenAPI openAPI = new OpenAPIParser()
+            .readLocation("src/test/resources/bugs/issue_14731.yaml", null, new ParseOptions()).getOpenAPI();
+
+        JavaClientCodegen codegen = new JavaClientCodegen();
+        codegen.setOutputDir(output.getAbsolutePath());
+        codegen.additionalProperties().put(CXFServerFeatures.LOAD_TEST_DATA_FROM_FILE, "true");
+        codegen.setUseOneOfInterfaces(true);
+
+        ClientOptInput input = new ClientOptInput();
+        input.openAPI(openAPI);
+        input.config(codegen);
+
+        DefaultGenerator generator = new DefaultGenerator();
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODELS, "true");
+        generator.setGeneratorPropertyDefault(CodegenConstants.LEGACY_DISCRIMINATOR_BEHAVIOR, "false");
+
+
+        codegen.setUseOneOfInterfaces(true);
+        codegen.setLegacyDiscriminatorBehavior(false);
+        codegen.setUseJakartaEe(true);
+        codegen.setModelNameSuffix("DTO");
+        codegen.setLibrary(JavaClientCodegen.RESTTEMPLATE);
+
+
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_TESTS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_DOCS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.APIS, "true");
+        generator.setGeneratorPropertyDefault(CodegenConstants.SUPPORTING_FILES, "false");
+
+        generator.opts(input).generate();
+
+        assertFileContains(Paths.get(outputPath + "/src/main/java/org/openapitools/client/model/ChildWithoutMappingADTO.java"), "@JsonTypeName");
+        assertFileContains(Paths.get(outputPath + "/src/main/java/org/openapitools/client/model/ChildWithoutMappingBDTO.java"), "@JsonTypeName");
+    }
 }

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/spring/SpringCodegenTest.java

@@ -1141,6 +1141,85 @@ public void testOneOfAndAllOf() throws IOException {
         assertFileContains(Paths.get(outputPath + "/src/main/java/org/openapitools/model/PizzaSpeziale.java"), "import java.math.BigDecimal");
     }
 
+    @Test
+    public void testDiscriminatorWithMappingIssue14731() throws IOException {
+        File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
+        output.deleteOnExit();
+        String outputPath = output.getAbsolutePath().replace('\\', '/');
+        OpenAPI openAPI = new OpenAPIParser()
+            .readLocation("src/test/resources/bugs/issue_14731.yaml", null, new ParseOptions()).getOpenAPI();
+
+        SpringCodegen codegen = new SpringCodegen();
+        codegen.setOutputDir(output.getAbsolutePath());
+        codegen.additionalProperties().put(CXFServerFeatures.LOAD_TEST_DATA_FROM_FILE, "true");
+        codegen.setUseOneOfInterfaces(true);
+
+        ClientOptInput input = new ClientOptInput();
+        input.openAPI(openAPI);
+        input.config(codegen);
+
+        DefaultGenerator generator = new DefaultGenerator();
+        codegen.setHateoas(true);
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODELS, "true");
+        generator.setGeneratorPropertyDefault(CodegenConstants.LEGACY_DISCRIMINATOR_BEHAVIOR, "false");
+
+
+        codegen.setUseOneOfInterfaces(true);
+        codegen.setLegacyDiscriminatorBehavior(false);
+        codegen.setUseSpringBoot3(true);
+        codegen.setModelNameSuffix("DTO");
+
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_TESTS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_DOCS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.APIS, "true");
+        generator.setGeneratorPropertyDefault(CodegenConstants.SUPPORTING_FILES, "false");
+
+        generator.opts(input).generate();
+
+        assertFileNotContains(Paths.get(outputPath + "/src/main/java/org/openapitools/model/ChildWithMappingADTO.java"), "@JsonTypeName");
+        assertFileNotContains(Paths.get(outputPath + "/src/main/java/org/openapitools/model/ChildWithMappingBDTO.java"), "@JsonTypeName");
+    }
+
+    @Test
+    public void testDiscriminatorWithoutMappingIssue14731() throws IOException {
+        File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
+        output.deleteOnExit();
+        String outputPath = output.getAbsolutePath().replace('\\', '/');
+        OpenAPI openAPI = new OpenAPIParser()
+            .readLocation("src/test/resources/bugs/issue_14731.yaml", null, new ParseOptions()).getOpenAPI();
+
+        SpringCodegen codegen = new SpringCodegen();
+        codegen.setOutputDir(output.getAbsolutePath());
+        codegen.additionalProperties().put(CXFServerFeatures.LOAD_TEST_DATA_FROM_FILE, "true");
+        codegen.setUseOneOfInterfaces(true);
+
+        ClientOptInput input = new ClientOptInput();
+        input.openAPI(openAPI);
+        input.config(codegen);
+
+        DefaultGenerator generator = new DefaultGenerator();
+        codegen.setHateoas(true);
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODELS, "true");
+        generator.setGeneratorPropertyDefault(CodegenConstants.LEGACY_DISCRIMINATOR_BEHAVIOR, "false");
+
+
+        codegen.setUseOneOfInterfaces(true);
+        codegen.setLegacyDiscriminatorBehavior(false);
+        codegen.setUseSpringBoot3(true);
+        codegen.setModelNameSuffix("DTO");
+
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_TESTS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_DOCS, "false");
+        generator.setGeneratorPropertyDefault(CodegenConstants.APIS, "true");
+        generator.setGeneratorPropertyDefault(CodegenConstants.SUPPORTING_FILES, "false");
+
+        generator.opts(input).generate();
+
+
+        assertFileContains(Paths.get(outputPath + "/src/main/java/org/openapitools/model/ChildWithoutMappingADTO.java"), "@JsonTypeName");
+        assertFileContains(Paths.get(outputPath + "/src/main/java/org/openapitools/model/ChildWithoutMappingBDTO.java"), "@JsonTypeName");
+    }
+
     @Test
     public void testTypeMappings() {
         final SpringCodegen codegen = new SpringCodegen();

modules/openapi-generator/src/test/resources/bugs/issue_14731.yaml

@@ -0,0 +1,109 @@
+openapi: '3.0.0'
+info:
+  version: '1.0.0'
+  title: 'FooService'
+paths:
+  /parentWithMapping:
+    put:
+      tags:
+        - pet
+      summary: put parent
+      operationId: putParentWithMapping
+      requestBody:
+        description: The updated account definition to save.
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/ParentWithMapping'
+      responses:
+        '200':
+          $ref: '#/components/responses/ParentWithMapping'
+  /parentWithoutMapping:
+    put:
+      tags:
+        - pet
+      summary: put parent
+      operationId: putParentWithoutMapping
+      requestBody:
+        description: The updated account definition to save.
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/ParentWithoutMapping'
+      responses:
+        '200':
+          $ref: '#/components/responses/ParentWithoutMapping'
+components:
+  schemas:
+    ParentWithMapping:
+      type: object
+      description: Defines an account by name.
+      properties:
+        childType:
+          $ref: '#/components/schemas/ChildType'
+      required:
+        - type
+      discriminator:
+        propertyName: childType
+        mapping:
+          child_a: '#/components/schemas/ChildWithMappingA'
+          child_b: '#/components/schemas/ChildWithMappingB'
+
+    ChildWithMappingA:
+      allOf:
+        - $ref: "#/components/schemas/ParentWithMapping"
+        - type: object
+          properties:
+            nameA:
+              type: string
+    ChildWithMappingB:
+      allOf:
+        - $ref: "#/components/schemas/ParentWithMapping"
+        - type: object
+          properties:
+            nameB:
+              type: string
+    ChildType:
+      type: string
+      x-extensible-enum:
+        - child_a
+        - child_b
+    ParentWithoutMapping:
+      type: object
+      description: Defines an account by name.
+      properties:
+        childType:
+          $ref: '#/components/schemas/ChildType'
+      required:
+        - type
+      discriminator:
+        propertyName: childType
+    ChildWithoutMappingA:
+      allOf:
+        - $ref: "#/components/schemas/ParentWithoutMapping"
+        - type: object
+          properties:
+            nameA:
+              type: string
+    ChildWithoutMappingB:
+      allOf:
+        - $ref: "#/components/schemas/ParentWithoutMapping"
+        - type: object
+          properties:
+            nameB:
+              type: string
+  responses:
+    ParentWithMapping:
+      description: OK
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/ParentWithMapping'
+    ParentWithoutMapping:
+      description: The saved account definition.
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/ParentWithoutMapping'

samples/client/petstore/spring-http-interface/src/main/java/org/openapitools/model/AnimalDto.java

@@ -34,7 +34,6 @@
   @JsonSubTypes.Type(value = DogDto.class, name = "Dog")
 })
 
-@JsonTypeName("Animal")
 @Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
 public class AnimalDto {
 

samples/client/petstore/spring-http-interface/src/main/java/org/openapitools/model/CatDto.java

@@ -31,7 +31,6 @@
   @JsonSubTypes.Type(value = BigCatDto.class, name = "BigCat")
 })
 
-@JsonTypeName("Cat")
 @Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
 public class CatDto extends AnimalDto {
 

samples/server/petstore/springboot/src/main/java/org/openapitools/model/AnimalDto.java

@@ -37,7 +37,6 @@
   @JsonSubTypes.Type(value = DogDto.class, name = "Dog")
 })
 
-@JsonTypeName("Animal")
 @Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
 public class AnimalDto {
 

samples/server/petstore/springboot/src/main/java/org/openapitools/model/CatDto.java

@@ -34,7 +34,6 @@
   @JsonSubTypes.Type(value = BigCatDto.class, name = "BigCat")
 })
 
-@JsonTypeName("Cat")
 @Generated(value = "org.openapitools.codegen.languages.SpringCodegen")
 public class CatDto extends AnimalDto {