Backoff KotlinBeanInfoFactory for enum types.

We now no longer contribute properties for enum types.

Closes #2990

src/main/java/org/springframework/data/util/KotlinBeanInfoFactory.java

@@ -48,7 +48,7 @@ public class KotlinBeanInfoFactory implements BeanInfoFactory, Ordered {
 	@Override
 	public BeanInfo getBeanInfo(Class<?> beanClass) throws IntrospectionException {
 
-		if (beanClass.isInterface()) {
+		if (beanClass.isInterface() || beanClass.isEnum()) {
 			return null; // back-off to leave interface-based properties to the default mechanism.
 		}
 
@@ -56,7 +56,6 @@ public class KotlinBeanInfoFactory implements BeanInfoFactory, Ordered {
 			return null;
 		}
 
-
 		KClass<?> kotlinClass = JvmClassMappingKt.getKotlinClass(beanClass);
 		List<PropertyDescriptor> pds = new ArrayList<>();
 

src/test/kotlin/org/springframework/data/util/KotlinBeanInfoFactoryUnitTests.kt

@@ -73,6 +73,14 @@ class KotlinBeanInfoFactoryUnitTests {
 		assertThat(pds).hasSize(1).extracting("name").containsOnly("firstname")
 	}
 
+	@Test // GH-2990
+	internal fun backsOffForEnums() {
+
+		val pds = BeanUtils.getPropertyDescriptors(MyEnum::class.java)
+
+		assertThat(pds).extracting("name").contains("ordinal")
+	}
+
 	data class SimpleDataClass(val id: String, var name: String)
 
 	@JvmInline
@@ -86,4 +94,8 @@ class KotlinBeanInfoFactoryUnitTests {
 		fun getFirstname(): String
 	}
 
+	enum class MyEnum {
+		Foo, Bar
+	}
+
 }