Register hints for superclass in BindingReflectionHintsRegistrar

Closes gh-31552

Author: sdeleuze

spring-core/src/main/java/org/springframework/aot/hint/BindingReflectionHintsRegistrar.java

@@ -159,6 +159,10 @@ private void collectReferencedTypes(Set<Class<?>> types, ResolvableType resolvab
 			for (ResolvableType genericResolvableType : resolvableType.getGenerics()) {
 				collectReferencedTypes(types, genericResolvableType);
 			}
+			Class<?> superClass = clazz.getSuperclass();
+			if (superClass != null && superClass != Object.class && superClass != Record.class && superClass != Enum.class) {
+				types.add(superClass);
+			}
 		}
 	}
 

spring-core/src/test/java/org/springframework/aot/hint/BindingReflectionHintsRegistrarTests.java

@@ -63,6 +63,28 @@ void registerTypeForSerializationWithEmptyClass() {
 				});
 	}
 
+	@Test
+	void registerTypeForSerializationWithExtendingClass() {
+		bindingRegistrar.registerReflectionHints(this.hints.reflection(), SampleExtendingClass.class);
+		assertThat(this.hints.reflection().typeHints()).satisfiesExactlyInAnyOrder(
+				typeHint -> {
+					assertThat(typeHint.getType()).isEqualTo(TypeReference.of(SampleEmptyClass.class));
+					assertThat(typeHint.getMemberCategories()).containsExactlyInAnyOrder(
+							MemberCategory.DECLARED_FIELDS, MemberCategory.INVOKE_DECLARED_CONSTRUCTORS);
+					assertThat(typeHint.constructors()).isEmpty();
+					assertThat(typeHint.fields()).isEmpty();
+					assertThat(typeHint.methods()).isEmpty();
+				},
+				typeHint -> {
+					assertThat(typeHint.getType()).isEqualTo(TypeReference.of(SampleExtendingClass.class));
+					assertThat(typeHint.getMemberCategories()).containsExactlyInAnyOrder(
+							MemberCategory.DECLARED_FIELDS, MemberCategory.INVOKE_DECLARED_CONSTRUCTORS);
+					assertThat(typeHint.constructors()).isEmpty();
+					assertThat(typeHint.fields()).isEmpty();
+					assertThat(typeHint.methods()).isEmpty();
+				});
+	}
+
 	@Test
 	void registerTypeForSerializationWithNoProperty() {
 		bindingRegistrar.registerReflectionHints(this.hints.reflection(), SampleClassWithNoProperty.class);
@@ -284,6 +306,9 @@ void registerTypeForAnnotationOnMethodAndField() {
 	static class SampleEmptyClass {
 	}
 
+	static class SampleExtendingClass extends SampleEmptyClass {
+	}
+
 	static class SampleClassWithNoProperty {
 
 		String name() {