Add a unit test to show that the annotations are generated as expected

Author: Mattias-Sehlstedt

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

@@ -3490,6 +3490,40 @@ public void testHasOperationParameterExtraAnnotation_issue18224() throws IOExcep
                 .containsWithName("com.test.MyAnnotationInHeader");
     }
 
+    @Test
+    public void testModelHasParameterExtraAnnotations_issue19953() {
+        Path output = TestUtils.newTempFolder();
+
+        final OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/issue_18224.yaml");
+        final SpringCodegen codegen = new SpringCodegen();
+        codegen.setOpenAPI(openAPI);
+        codegen.setOutputDir(output.toString());
+
+        codegen.additionalProperties().put(SpringCodegen.DATE_LIBRARY, "java8-localdatetime");
+        codegen.additionalProperties().put(INTERFACE_ONLY, "true");
+        codegen.additionalProperties().put(USE_RESPONSE_ENTITY, "false");
+        codegen.additionalProperties().put(DELEGATE_PATTERN, "true");
+        codegen.additionalProperties().put(REQUEST_MAPPING_OPTION, "api_interface");
+        codegen.additionalProperties().put(SPRING_CONTROLLER, "true");
+
+        ClientOptInput input = new ClientOptInput();
+        input.openAPI(openAPI);
+        input.config(codegen);
+
+        DefaultGenerator generator = new DefaultGenerator();
+        generator.setGenerateMetadata(false); // skip metadata generation
+        generator.setGeneratorPropertyDefault(CodegenConstants.MODELS, "true");
+
+        Map<String, File> files = generator.opts(input).generate().stream()
+                .collect(Collectors.toMap(File::getName, Function.identity()));
+
+        JavaFileAssert javaFileAssert = JavaFileAssert.assertThat(files.get("ObjTest.java"));
+        javaFileAssert.assertProperty("field3")
+                .assertPropertyAnnotations()
+                .containsWithName("com.test.MyAnnotation")
+                .containsWithName("com.test.MyAnnotation2");
+    }
+
     @Test
     public void testHasOperationExtraAnnotation_issue15822() throws IOException {
         File output = Files.createTempDirectory("test").toFile().getCanonicalFile();

modules/openapi-generator/src/test/resources/3_0/issue_18224.yaml

@@ -64,3 +64,6 @@ components:
         field3:
           type: string
           pattern: "\\w"
+          x-field-extra-annotation:
+            - '@com.test.MyAnnotation'
+            - '@com.test.MyAnnotation2'