Test detection of original generic method for CGLIB bridge method

See gh-32888

spring-beans/src/test/java/org/springframework/beans/BeanUtilsTests.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.
@@ -41,6 +41,8 @@ import org.springframework.beans.propertyeditors.CustomDateEditor;
 import org.springframework.beans.testfixture.beans.DerivedTestBean;
 import org.springframework.beans.testfixture.beans.ITestBean;
 import org.springframework.beans.testfixture.beans.TestBean;
+import org.springframework.cglib.proxy.Enhancer;
+import org.springframework.cglib.proxy.MethodInterceptor;
 import org.springframework.core.io.Resource;
 import org.springframework.core.io.ResourceEditor;
 import org.springframework.lang.Nullable;
@@ -51,7 +53,7 @@ import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException
 import static org.assertj.core.api.SoftAssertions.assertSoftly;
 
 /**
- * Unit tests for {@link BeanUtils}.
+ * Tests for {@link BeanUtils}.
  *
  * @author Juergen Hoeller
  * @author Rob Harrop
@@ -321,7 +323,8 @@ class BeanUtilsTests {
 		Order original = new Order("test", List.of("foo", "bar"));
 
 		// Create a Proxy that loses the generic type information for the getLineItems() method.
-		OrderSummary proxy = proxyOrder(original);
+		OrderSummary proxy = (OrderSummary) Proxy.newProxyInstance(getClass().getClassLoader(),
+				new Class<?>[] {OrderSummary.class}, new OrderInvocationHandler(original));
 		assertThat(OrderSummary.class.getDeclaredMethod("getLineItems").toGenericString())
 				.contains("java.util.List<java.lang.String>");
 		assertThat(proxy.getClass().getDeclaredMethod("getLineItems").toGenericString())
@@ -339,6 +342,23 @@ class BeanUtilsTests {
 		assertThat(target.getLineItems()).containsExactly("foo", "bar");
 	}
 
+	@Test  // gh-32888
+	public void copyPropertiesWithGenericCglibClass() {
+		Enhancer enhancer = new Enhancer();
+		enhancer.setSuperclass(User.class);
+		enhancer.setCallback((MethodInterceptor) (obj, method, args, proxy) -> proxy.invokeSuper(obj, args));
+		User user = (User) enhancer.create();
+		user.setId(1);
+		user.setName("proxy");
+		user.setAddress("addr");
+
+		User target = new User();
+		BeanUtils.copyProperties(user, target);
+		assertThat(target.getId()).isEqualTo(user.getId());
+		assertThat(target.getName()).isEqualTo(user.getName());
+		assertThat(target.getAddress()).isEqualTo(user.getAddress());
+	}
+
 	@Test
 	void copyPropertiesWithEditable() throws Exception {
 		TestBean tb = new TestBean();
@@ -518,6 +538,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class IntegerHolder {
 
@@ -532,6 +553,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class WildcardListHolder1 {
 
@@ -546,6 +568,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class WildcardListHolder2 {
 
@@ -560,6 +583,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class NumberUpperBoundedWildcardListHolder {
 
@@ -574,6 +598,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class NumberListHolder {
 
@@ -588,6 +613,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class IntegerListHolder1 {
 
@@ -602,6 +628,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class IntegerListHolder2 {
 
@@ -616,6 +643,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class LongListHolder {
 
@@ -796,6 +824,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	private static class BeanWithNullableTypes {
 
 		private Integer counter;
@@ -826,6 +855,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	private static class BeanWithPrimitiveTypes {
 
 		private boolean flag;
@@ -838,7 +868,6 @@ class BeanUtilsTests {
 		private char character;
 		private String text;
 
-
 		@SuppressWarnings("unused")
 		public BeanWithPrimitiveTypes(boolean flag, byte byteCount, short shortCount, int intCount, long longCount,
 				float floatCount, double doubleCount, char character, String text) {
@@ -889,21 +918,22 @@ class BeanUtilsTests {
 		public String getText() {
 			return text;
 		}
-
 	}
 
+
 	private static class PrivateBeanWithPrivateConstructor {
 
 		private PrivateBeanWithPrivateConstructor() {
 		}
 	}
 
+
 	@SuppressWarnings("unused")
 	private static class Order {
 
 		private String id;
-		private List<String> lineItems;
 
+		private List<String> lineItems;
 
 		Order() {
 		}
@@ -935,6 +965,7 @@ class BeanUtilsTests {
 		}
 	}
 
+
 	private interface OrderSummary {
 
 		String getId();
@@ -943,17 +974,10 @@ class BeanUtilsTests {
 	}
 
 
-	private OrderSummary proxyOrder(Order order) {
-		return (OrderSummary) Proxy.newProxyInstance(getClass().getClassLoader(),
-			new Class<?>[] { OrderSummary.class }, new OrderInvocationHandler(order));
-	}
-
-
 	private static class OrderInvocationHandler implements InvocationHandler {
 
 		private final Order order;
 
-
 		OrderInvocationHandler(Order order) {
 			this.order = order;
 		}
@@ -971,4 +995,46 @@ class BeanUtilsTests {
 		}
 	}
 
+
+	private static class GenericBaseModel<T> {
+
+		private T id;
+
+		private String name;
+
+		public T getId() {
+			return id;
+		}
+
+		public void setId(T id) {
+			this.id = id;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+	}
+
+
+	private static class User extends GenericBaseModel<Integer> {
+
+		private String address;
+
+		public User() {
+			super();
+		}
+
+		public String getAddress() {
+			return address;
+		}
+
+		public void setAddress(String address) {
+			this.address = address;
+		}
+	}
+
 }

spring-core/src/main/java/org/springframework/core/BridgeMethodResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 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.
@@ -57,11 +57,11 @@ public final class BridgeMethodResolver {
 
 
 	/**
-	 * Find the original method for the supplied {@link Method bridge Method}.
+	 * Find the local original method for the supplied {@link Method bridge Method}.
 	 * <p>It is safe to call this method passing in a non-bridge {@link Method} instance.
 	 * In such a case, the supplied {@link Method} instance is returned directly to the caller.
 	 * Callers are <strong>not</strong> required to check for bridging before calling this method.
-	 * @param bridgeMethod the method to introspect
+	 * @param bridgeMethod the method to introspect against its declaring class
 	 * @return the original method (either the bridged method or the passed-in method
 	 * if no more specific one could be found)
 	 */
@@ -73,8 +73,7 @@ public final class BridgeMethodResolver {
 		if (bridgedMethod == null) {
 			// Gather all methods with matching name and parameter size.
 			List<Method> candidateMethods = new ArrayList<>();
-			MethodFilter filter = candidateMethod ->
-					isBridgedCandidateFor(candidateMethod, bridgeMethod);
+			MethodFilter filter = (candidateMethod -> isBridgedCandidateFor(candidateMethod, bridgeMethod));
 			ReflectionUtils.doWithMethods(bridgeMethod.getDeclaringClass(), candidateMethods::add, filter);
 			if (!candidateMethods.isEmpty()) {
 				bridgedMethod = candidateMethods.size() == 1 ?
@@ -121,8 +120,8 @@ public final class BridgeMethodResolver {
 				return candidateMethod;
 			}
 			else if (previousMethod != null) {
-				sameSig = sameSig &&
-						Arrays.equals(candidateMethod.getGenericParameterTypes(), previousMethod.getGenericParameterTypes());
+				sameSig = sameSig && Arrays.equals(
+						candidateMethod.getGenericParameterTypes(), previousMethod.getGenericParameterTypes());
 			}
 			previousMethod = candidateMethod;
 		}
@@ -163,7 +162,8 @@ public final class BridgeMethodResolver {
 				}
 			}
 			// A non-array type: compare the type itself.
-			if (!ClassUtils.resolvePrimitiveIfNecessary(candidateParameter).equals(ClassUtils.resolvePrimitiveIfNecessary(genericParameter.toClass()))) {
+			if (!ClassUtils.resolvePrimitiveIfNecessary(candidateParameter).equals(
+					ClassUtils.resolvePrimitiveIfNecessary(genericParameter.toClass()))) {
 				return false;
 			}
 		}
@@ -226,8 +226,8 @@ public final class BridgeMethodResolver {
 	/**
 	 * Compare the signatures of the bridge method and the method which it bridges. If
 	 * the parameter and return types are the same, it is a 'visibility' bridge method
-	 * introduced in Java 6 to fix https://bugs.openjdk.org/browse/JDK-6342411.
-	 * See also https://stas-blogspot.blogspot.com/2010/03/java-bridge-methods-explained.html
+	 * introduced in Java 6 to fix <a href="https://bugs.openjdk.org/browse/JDK-6342411">
+	 * JDK-6342411</a>.
 	 * @return whether signatures match as described
 	 */
 	public static boolean isVisibilityBridgeMethodPair(Method bridgeMethod, Method bridgedMethod) {