Merge branch '6.1.x'

spring-core/src/test/java/a/ClassHavingNestedClass.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,6 +19,9 @@ package a;
 /**
  * Test class for {@code org.springframework.util.ClassUtilsTests}.
  *
+ * <p>The use case for this test class requires that the package name is a single
+ * character (i.e., length of 1).
+ *
  * @author Johnny Lim
  */
 public class ClassHavingNestedClass {

spring-core/src/test/java/org/springframework/core/MethodIntrospectorTests.java

@@ -0,0 +1,112 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.core;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.reflect.Method;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.core.MethodIntrospector.MetadataLookup;
+import org.springframework.core.annotation.MergedAnnotations;
+import org.springframework.util.ReflectionUtils;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.core.annotation.MergedAnnotations.SearchStrategy.TYPE_HIERARCHY;
+
+/**
+ * Tests for {@link MethodIntrospector}.
+ *
+ * @author Sam Brannen
+ * @since 5.3.34
+ */
+class MethodIntrospectorTests {
+
+	@Test  // gh-32586
+	void selectMethodsAndClearDeclaredMethodsCacheBetweenInvocations() {
+		Class<?> targetType = ActualController.class;
+
+		// Preconditions for this use case.
+		assertThat(targetType).isPublic();
+		assertThat(targetType.getSuperclass()).isPackagePrivate();
+
+		MetadataLookup<String> metadataLookup = (MetadataLookup<String>) method -> {
+			if (MergedAnnotations.from(method, TYPE_HIERARCHY).isPresent(Mapped.class)) {
+				return method.getName();
+			}
+			return null;
+		};
+
+		// Start with a clean slate.
+		ReflectionUtils.clearCache();
+
+		// Round #1
+		Map<Method, String> methods = MethodIntrospector.selectMethods(targetType, metadataLookup);
+		assertThat(methods.values()).containsExactlyInAnyOrder("update", "delete");
+
+		// Simulate ConfigurableApplicationContext#refresh() which clears the
+		// ReflectionUtils#declaredMethodsCache but NOT the BridgeMethodResolver#cache.
+		// As a consequence, ReflectionUtils.getDeclaredMethods(...) will return a
+		// new set of methods that are logically equivalent to but not identical
+		// to (in terms of object identity) any bridged methods cached in the
+		// BridgeMethodResolver cache.
+		ReflectionUtils.clearCache();
+
+		// Round #2
+		methods = MethodIntrospector.selectMethods(targetType, metadataLookup);
+		assertThat(methods.values()).containsExactlyInAnyOrder("update", "delete");
+	}
+
+
+	@Retention(RetentionPolicy.RUNTIME)
+	@interface Mapped {
+	}
+
+	interface Controller {
+
+		void unmappedMethod();
+
+		@Mapped
+		void update();
+
+		@Mapped
+		void delete();
+	}
+
+	// Must NOT be public.
+	abstract static class AbstractController implements Controller {
+
+		@Override
+		public void unmappedMethod() {
+		}
+
+		@Override
+		public void delete() {
+		}
+	}
+
+	// MUST be public.
+	public static class ActualController extends AbstractController {
+
+		@Override
+		public void update() {
+		}
+	}
+
+}

spring-core/src/test/java/org/springframework/util/ClassUtilsTests.java

@@ -33,6 +33,7 @@ import java.util.List;
 import java.util.Set;
 import java.util.function.Supplier;
 
+import a.ClassHavingNestedClass;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
@@ -86,8 +87,11 @@ class ClassUtilsTests {
 	void forNameWithNestedType() throws ClassNotFoundException {
 		assertThat(ClassUtils.forName("org.springframework.util.ClassUtilsTests$NestedClass", classLoader)).isEqualTo(NestedClass.class);
 		assertThat(ClassUtils.forName("org.springframework.util.ClassUtilsTests.NestedClass", classLoader)).isEqualTo(NestedClass.class);
-		assertThat(ClassUtils.forName("a.ClassHavingNestedClass$NestedClass", classLoader)).isEqualTo(a.ClassHavingNestedClass.NestedClass.class);
-		assertThat(ClassUtils.forName("a.ClassHavingNestedClass.NestedClass", classLoader)).isEqualTo(a.ClassHavingNestedClass.NestedClass.class);
+
+		// Precondition: package name must have length == 1.
+		assertThat(ClassHavingNestedClass.class.getPackageName().length()).isEqualTo(1);
+		assertThat(ClassUtils.forName("a.ClassHavingNestedClass$NestedClass", classLoader)).isEqualTo(ClassHavingNestedClass.NestedClass.class);
+		assertThat(ClassUtils.forName("a.ClassHavingNestedClass.NestedClass", classLoader)).isEqualTo(ClassHavingNestedClass.NestedClass.class);
 	}
 
 	@Test