Ensure only immediate member classes are only included

Update `ClassFileClassMetadata` so that member classes only include
immediate children. This aligns with the other `ClassMetadata`
implementations.

Closes gh-34869

spring-core/src/main/java24/org/springframework/core/type/classreading/ClassFileClassMetadata.java

@@ -268,18 +268,16 @@ class ClassFileClassMetadata implements AnnotationMetadata {
 		void nestMembers(String currentClassName, InnerClassesAttribute innerClasses) {
 			for (InnerClassInfo classInfo : innerClasses.classes()) {
 				String innerClassName = classInfo.innerClass().name().stringValue();
-				// skip parent inner classes
-				if (!innerClassName.startsWith(currentClassName)) {
-					continue;
-				}
-				// the current class is an inner class
-				else if (currentClassName.equals(innerClassName)) {
+				if (currentClassName.equals(innerClassName)) {
+					// the current class is an inner class
 					this.innerAccessFlags = classInfo.flags();
 				}
-				// collecting data about actual inner classes
-				else {
-					this.memberClassNames.add(ClassUtils.convertResourcePathToClassName(innerClassName));
-				}
+				classInfo.outerClass().ifPresent(outerClass -> {
+					if (outerClass.name().stringValue().equals(currentClassName)) {
+						// collecting data about actual inner classes
+						this.memberClassNames.add(ClassUtils.convertResourcePathToClassName(innerClassName));
+					}
+				});
 			}
 		}
 

spring-core/src/test/java/org/springframework/core/type/AbstractAnnotationMetadataTests.java

@@ -184,6 +184,13 @@ public abstract class AbstractAnnotationMetadataTests {
 					TestMemberClass.TestMemberClassInnerClass.class.getName(), TestMemberClass.TestMemberClassInnerInterface.class.getName());
 		}
 
+		@Test
+		void getMemberClassNamesWhenHasNestedMemberClassesReturnsOnlyFirstLevel() {
+			assertThat(get(TestNestedMemberClass.class).getMemberClassNames()).containsOnly(
+					TestNestedMemberClass.TestMemberClassInnerClassA.class.getName(),
+					TestNestedMemberClass.TestMemberClassInnerClassB.class.getName());
+		}
+
 		@Test
 		void getMemberClassNamesWhenHasNoMemberClassesReturnsEmptyArray() {
 			assertThat(get(TestClass.class).getMemberClassNames()).isEmpty();
@@ -220,6 +227,22 @@ public abstract class AbstractAnnotationMetadataTests {
 
 		}
 
+		public static class TestNestedMemberClass {
+
+			public static class TestMemberClassInnerClassA {
+
+				public static class TestMemberClassInnerClassAA {
+
+				}
+
+			}
+
+			public static class TestMemberClassInnerClassB {
+
+			}
+
+		}
+
 	}
 
 	@Nested