[Java][Spring] Fix formParams template to add support for default values when generating @RequestParam annotation for parameters included in a body with content: application/x-www-form-urlencoded

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

@@ -1 +1,2 @@
-{{#isFormParam}}{{^isFile}}{{>paramDoc}}{{#useBeanValidation}} @Valid{{/useBeanValidation}} {{#isModel}}@RequestPart{{/isModel}}{{^isModel}}{{#isArray}}@RequestPart{{/isArray}}{{^isArray}}{{#reactive}}@RequestPart{{/reactive}}{{^reactive}}@RequestParam{{/reactive}}{{/isArray}}{{/isModel}}(value = "{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}){{>dateTimeParam}} {{^required}}{{#useOptional}}Optional<{{/useOptional}}{{/required}}{{{dataType}}}{{^required}}{{#useOptional}}>{{/useOptional}}{{/required}} {{paramName}}{{/isFile}}{{#isFile}}{{>paramDoc}} @RequestPart(value = "{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}) {{#isArray}}List<{{/isArray}}{{#reactive}}Flux<Part>{{/reactive}}{{^reactive}}MultipartFile{{/reactive}}{{#isArray}}>{{/isArray}} {{paramName}}{{/isFile}}{{/isFormParam}}
+{{#isFormParam}}{{^isFile}}{{>paramDoc}}{{#useBeanValidation}} @Valid{{/useBeanValidation}} {{#isModel}}@RequestPart{{/isModel}}{{^isModel}}{{#isArray}}@RequestPart{{/isArray}}{{^isArray}}{{#reactive}}@RequestPart{{/reactive}}{{^reactive}}@RequestParam{{/reactive}}{{/isArray}}{{/isModel}}(value = "{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}{{#defaultValue}}, defaultValue = "{{{.}}}"{{/defaultValue}}){{>dateTimeParam}} {{^required}}{{#useOptional}}Optional<{{/useOptional}}{{/required}}{{{dataType}}}{{^required}}{{#useOptional}}>{{/useOptional}}{{/required}} {{paramName}}{{/isFile}}{{#isFile}}{{>paramDoc}} @RequestPart(value = "{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}) {{#isArray}}List<{{/isArray}}{{#reactive}}Flux<Part>{{/reactive}}{{^reactive}}MultipartFile{{/reactive}}{{#isArray}}>{{/isArray}} {{paramName}}{{/isFile}}{{/isFormParam}}
+

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

@@ -5177,6 +5177,29 @@ public void shouldGenerateSingleDeprecatedAnnotation() {
                 .doesNotHaveAnnotation("Deprecated");
     }
 
+    @Test
+    public void testRequestBodyFormParamsDefaultValue() {
+        final var tempDir = TestUtils.newTempFolder();
+        final CodegenConfigurator configurator = new CodegenConfigurator()
+                .setInputSpec("src/test/resources/3_0/spring/formParams_defaultValue.yaml")
+                .setGeneratorName("spring")
+                .setOutputDir(tempDir.toString());
+
+        new DefaultGenerator().opts(configurator.toClientOptInput()).generate();
+
+        JavaFileAssert.assertThat(tempDir.resolve("src/main/java/org/openapitools/api/SomeApi.java"))
+                .assertMethod("someDummyEndpoint", "String", "String")
+                .assertParameter("productId")
+                .assertParameterAnnotations()
+                .containsWithNameAndAttributes("RequestParam",
+                        Map.of("value", "\"product_id\"", "required", "true"))
+                .toParameter().toMethod()
+                .assertParameter("locale")
+                .assertParameterAnnotations()
+                .containsWithNameAndAttributes("RequestParam",
+                        Map.of("value", "\"locale\"", "required", "false", "defaultValue", "\"en_US\""));
+    }
+
     @Test
     public void shouldAnnotateNonRequiredFieldsAsNullable() throws IOException {
         SpringCodegen codegen = new SpringCodegen();

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

@@ -0,0 +1,42 @@
+openapi: 3.0.0
+info:
+  version: "1.0.0"
+  title: formParams-defaultValue-test
+paths:
+  /some/dummy/endpoint:
+    post:
+      operationId: someDummyEndpoint
+      requestBody:
+        required: true
+        content:
+          application/x-www-form-urlencoded:
+            schema:
+              $ref: '#/components/schemas/DummyRequest'
+      responses:
+        200:
+          description: Successfully created
+          content:
+            application/json:
+              schema:
+                type: object
+                additionalProperties:
+                  $ref: '#/components/schemas/DummyResponse'
+components:
+  schemas:
+    DummyResponse:
+      required:
+        - status
+      type: object
+      properties:
+        status:
+          type: string
+    DummyRequest:
+      required:
+        - product_id
+      type: object
+      properties:
+        product_id:
+          type: string
+        locale:
+          type: string
+          default: "en_US"