fix(kotlin-spring): skip @field:Valid on Map container properties (HV000271)

modules/openapi-generator/src/main/resources/kotlin-spring/beanValidation.mustache

@@ -1,4 +1,4 @@
-{{#isContainer}}{{^isPrimitiveType}}{{^isEnum}}
-    @field:Valid{{/isEnum}}{{/isPrimitiveType}}{{/isContainer}}{{!
+{{#isContainer}}{{^isMap}}{{^isPrimitiveType}}{{^isEnum}}
+    @field:Valid{{/isEnum}}{{/isPrimitiveType}}{{/isMap}}{{/isContainer}}{{!
 }}{{^isContainer}}{{^isPrimitiveType}}{{^isNumber}}{{^isUuid}}{{^isDateTime}}
     @field:Valid{{/isDateTime}}{{/isUuid}}{{/isNumber}}{{/isPrimitiveType}}{{/isContainer}}

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

@@ -6777,4 +6777,26 @@ public void schemaMappingWithNullableAllOfRendersNullableKotlinProperty() throws
         String content = Files.readString(myObjectFile.toPath());
         assertThat(content).contains("com.example.ExternalModel?");
     }
+
+    @Test
+    public void mapPropertiesDoNotGetFieldValidAnnotation_HV000271() throws IOException {
+        // Hibernate Validator deprecated @Valid on Map containers (HV000271).
+        // @field:Valid must not be emitted for Map properties; it must still be emitted for List properties.
+        Map<String, File> files = generateFromContract(
+                "src/test/resources/3_0/spring/map-field-valid-hv000271.yaml",
+                new HashMap<>(Map.of(KotlinSpringServerCodegen.USE_BEANVALIDATION, "true"))
+        );
+
+        File containerFile = files.get("Container.kt");
+        assertThat(containerFile).isNotNull();
+
+        String content = Files.readString(containerFile.toPath());
+        assertThat(content).contains("val mapProp:");
+        assertThat(content).contains("val listProp:");
+
+        long fieldValidCount = content.lines().filter(line -> line.contains("@field:Valid")).count();
+        assertThat(fieldValidCount)
+                .as("@field:Valid must appear only on the list property, not on the map property (HV000271)")
+                .isEqualTo(1);
+    }
 }

modules/openapi-generator/src/test/resources/3_0/spring/map-field-valid-hv000271.yaml

@@ -0,0 +1,23 @@
+openapi: 3.0.0
+info:
+  version: "1.0.0"
+  title: map-field-valid-hv000271
+paths: {}
+components:
+  schemas:
+    Item:
+      type: object
+      properties:
+        name:
+          type: string
+    Container:
+      type: object
+      properties:
+        mapProp:
+          type: object
+          additionalProperties:
+            $ref: '#/components/schemas/Item'
+        listProp:
+          type: array
+          items:
+            $ref: '#/components/schemas/Item'