BridgeMethodResolver properly resolves interface hierarchies

Issue: SPR-16103

(cherry picked from commit 182da15)

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2017 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.
@@ -59,6 +59,7 @@ public abstract class BridgeMethodResolver {
 		if (bridgeMethod == null || !bridgeMethod.isBridge()) {
 			return bridgeMethod;
 		}
+
 		// Gather all methods with matching name and parameter size.
 		List<Method> candidateMethods = new ArrayList<Method>();
 		Method[] methods = ReflectionUtils.getAllDeclaredMethods(bridgeMethod.getDeclaringClass());
@@ -67,10 +68,12 @@ public abstract class BridgeMethodResolver {
 				candidateMethods.add(candidateMethod);
 			}
 		}
+
 		// Now perform simple quick check.
 		if (candidateMethods.size() == 1) {
 			return candidateMethods.get(0);
 		}
+
 		// Search for candidate match.
 		Method bridgedMethod = searchCandidates(candidateMethods, bridgeMethod);
 		if (bridgedMethod != null) {
@@ -133,42 +136,13 @@ public abstract class BridgeMethodResolver {
 		return (method != null && isResolvedTypeMatch(method, candidateMethod, declaringClass));
 	}
 
-	/**
-	 * Searches for the generic {@link Method} declaration whose erased signature
-	 * matches that of the supplied bridge method.
-	 * @throws IllegalStateException if the generic declaration cannot be found
-	 */
-	private static Method findGenericDeclaration(Method bridgeMethod) {
-		// Search parent types for method that has same signature as bridge.
-		Class<?> superclass = bridgeMethod.getDeclaringClass().getSuperclass();
-		while (superclass != null && Object.class != superclass) {
-			Method method = searchForMatch(superclass, bridgeMethod);
-			if (method != null && !method.isBridge()) {
-				return method;
-			}
-			superclass = superclass.getSuperclass();
-		}
-
-		// Search interfaces.
-		Class<?>[] interfaces = ClassUtils.getAllInterfacesForClass(bridgeMethod.getDeclaringClass());
-		for (Class<?> ifc : interfaces) {
-			Method method = searchForMatch(ifc, bridgeMethod);
-			if (method != null && !method.isBridge()) {
-				return method;
-			}
-		}
-
-		return null;
-	}
-
 	/**
 	 * Returns {@code true} if the {@link Type} signature of both the supplied
 	 * {@link Method#getGenericParameterTypes() generic Method} and concrete {@link Method}
 	 * are equal after resolving all types against the declaringType, otherwise
 	 * returns {@code false}.
 	 */
-	private static boolean isResolvedTypeMatch(
+	private static boolean isResolvedTypeMatch(Method genericMethod, Method candidateMethod, Class<?> declaringClass) {
-			Method genericMethod, Method candidateMethod, Class<?> declaringClass) {
 		Type[] genericParameters = genericMethod.getGenericParameterTypes();
 		Class<?>[] candidateParameters = candidateMethod.getParameterTypes();
 		if (genericParameters.length != candidateParameters.length) {
@@ -191,13 +165,51 @@ public abstract class BridgeMethodResolver {
 		return true;
 	}
 
+	/**
+	 * Searches for the generic {@link Method} declaration whose erased signature
+	 * matches that of the supplied bridge method.
+	 * @throws IllegalStateException if the generic declaration cannot be found
+	 */
+	private static Method findGenericDeclaration(Method bridgeMethod) {
+		// Search parent types for method that has same signature as bridge.
+		Class<?> superclass = bridgeMethod.getDeclaringClass().getSuperclass();
+		while (superclass != null && Object.class != superclass) {
+			Method method = searchForMatch(superclass, bridgeMethod);
+			if (method != null && !method.isBridge()) {
+				return method;
+			}
+			superclass = superclass.getSuperclass();
+		}
+
+		Class<?>[] interfaces = ClassUtils.getAllInterfacesForClass(bridgeMethod.getDeclaringClass());
+		return searchInterfaces(interfaces, bridgeMethod);
+	}
+
+	private static Method searchInterfaces(Class<?>[] interfaces, Method bridgeMethod) {
+		for (Class<?> ifc : interfaces) {
+			Method method = searchForMatch(ifc, bridgeMethod);
+			if (method != null && !method.isBridge()) {
+				return method;
+			}
+			else {
+				return searchInterfaces(ifc.getInterfaces(), bridgeMethod);
+			}
+		}
+		return null;
+	}
+
 	/**
 	 * If the supplied {@link Class} has a declared {@link Method} whose signature matches
 	 * that of the supplied {@link Method}, then this matching {@link Method} is returned,
 	 * otherwise {@code null} is returned.
 	 */
 	private static Method searchForMatch(Class<?> type, Method bridgeMethod) {
-		return ReflectionUtils.findMethod(type, bridgeMethod.getName(), bridgeMethod.getParameterTypes());
+		try {
+			return type.getDeclaredMethod(bridgeMethod.getName(), bridgeMethod.getParameterTypes());
+		}
+		catch (NoSuchMethodException ex) {
+			return null;
+		}
 	}
 
 	/**

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2017 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.
@@ -344,8 +344,26 @@ public class BridgeMethodResolverTests {
 		assertEquals("findBy", bridgedMethod.getName());
 	}
 
+	@Test  // SPR-16103
+	public void testClassHierarchy() throws Exception {
+		doTestHierarchyResolution(FooClass.class);
+	}
 
-	public static interface Foo<T extends Serializable> {
+	@Test  // SPR-16103
+	public void testInterfaceHierarchy() throws Exception {
+		doTestHierarchyResolution(FooInterface.class);
+	}
+
+	private void doTestHierarchyResolution(Class<?> clazz) throws Exception {
+		for (Method method : clazz.getDeclaredMethods()){
+			Method bridged = BridgeMethodResolver.findBridgedMethod(method);
+			Method expected = clazz.getMethod("test", FooEntity.class);
+			assertEquals(expected, bridged);
+		}
+	}
+
+
+	public interface Foo<T extends Serializable> {
 
 		void someMethod(T theArg, Object otherArg);
 
@@ -396,7 +414,7 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface Adder<T> {
+	public interface Adder<T> {
 
 		void add(T item);
 	}
@@ -445,7 +463,7 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface Boo<E, T extends Serializable> {
+	public interface Boo<E, T extends Serializable> {
 
 		void foo(E e);
 
@@ -467,17 +485,15 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface Settings {
+	public interface Settings {
-
 	}
 
 
-	public static interface ConcreteSettings extends Settings {
+	public interface ConcreteSettings extends Settings {
-
 	}
 
 
-	public static interface Dao<T, S> {
+	public interface Dao<T, S> {
 
 		T load();
 
@@ -485,15 +501,14 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface SettingsDao<T extends Settings, S> extends Dao<T, S> {
+	public interface SettingsDao<T extends Settings, S> extends Dao<T, S> {
 
 		@Override
 		T load();
 	}
 
 
-	public static interface ConcreteSettingsDao extends
+	public interface ConcreteSettingsDao extends SettingsDao<ConcreteSettings, String> {
-			SettingsDao<ConcreteSettings, String> {
 
 		@Override
 		String loadFromParent();
@@ -511,7 +526,7 @@ public class BridgeMethodResolverTests {
 			this.otherObject = otherObject;
 		}
 
-		//@Transactional(readOnly = true)
+		// @Transactional(readOnly = true)
 		@Override
 		public S loadFromParent() {
 			return otherObject;
@@ -526,7 +541,7 @@ public class BridgeMethodResolverTests {
 			super(object, "From Parent");
 		}
 
-		//@Transactional(readOnly = true)
+		// @Transactional(readOnly = true)
 		@Override
 		public ConcreteSettings load() {
 			return super.object;
@@ -534,7 +549,7 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface Bounded<E> {
+	public interface Bounded<E> {
 
 		boolean boundedOperation(E e);
 	}
@@ -558,7 +573,7 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface GenericParameter<T> {
+	public interface GenericParameter<T> {
 
 		T getFor(Class<T> cls);
 	}
@@ -697,7 +712,7 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface Event {
+	public interface Event {
 
 		int getPriority();
 	}
@@ -727,24 +742,19 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface UserInitiatedEvent {
+	public interface UserInitiatedEvent {
-
-		//public Session getInitiatorSession();
 	}
 
 
-	public static abstract class BaseUserInitiatedEvent extends GenericEvent implements
+	public static abstract class BaseUserInitiatedEvent extends GenericEvent implements UserInitiatedEvent {
-			UserInitiatedEvent {
-
 	}
 
 
 	public static class MessageEvent extends BaseUserInitiatedEvent {
-
 	}
 
 
-	public static interface Channel<E extends Event> {
+	public interface Channel<E extends Event> {
 
 		void send(E event);
 
@@ -754,29 +764,27 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface Broadcaster {
+	public interface Broadcaster {
 	}
 
 
-	public static interface EventBroadcaster extends Broadcaster {
+	public interface EventBroadcaster extends Broadcaster {
 
-		public void subscribe();
+		void subscribe();
 
-		public void unsubscribe();
+		void unsubscribe();
 
-		public void setChannel(Channel<?> channel);
+		void setChannel(Channel<?> channel);
 	}
 
 
 	public static class GenericBroadcasterImpl implements Broadcaster {
-
 	}
 
 
 	@SuppressWarnings({ "unused", "unchecked" })
-	public static abstract class GenericEventBroadcasterImpl<T extends Event> extends
+	public static abstract class GenericEventBroadcasterImpl<T extends Event>
-			GenericBroadcasterImpl
+			extends GenericBroadcasterImpl implements EventBroadcaster {
-					implements EventBroadcaster {
 
 		private Class<T>[] subscribingEvents;
 
@@ -802,27 +810,24 @@ public class BridgeMethodResolverTests {
 
 		@Override
 		public void subscribe() {
-
 		}
 
 		@Override
 		public void unsubscribe() {
-
 		}
 
 		public GenericEventBroadcasterImpl(Class<? extends T>... events) {
-
 		}
 	}
 
 
-	public static interface Receiver<E extends Event> {
+	public interface Receiver<E extends Event> {
 
 		void receive(E event);
 	}
 
 
-	public static interface MessageBroadcaster extends Receiver<MessageEvent> {
+	public interface MessageBroadcaster extends Receiver<MessageEvent> {
 
 	}
 
@@ -845,7 +850,7 @@ public class BridgeMethodResolverTests {
 	@SuppressWarnings("unchecked")
 	public static class MessageBroadcasterImpl extends
 			GenericEventBroadcasterImpl<MessageEvent>
-					implements MessageBroadcaster {
+			implements MessageBroadcaster {
 
 		public MessageBroadcasterImpl() {
 			super(NewMessageEvent.class);
@@ -876,7 +881,7 @@ public class BridgeMethodResolverTests {
 	// SPR-2454 Test Classes
 	//-----------------------------
 
-	public static interface SimpleGenericRepository<T> {
+	public interface SimpleGenericRepository<T> {
 
 		public Class<T> getPersistentClass();
 
@@ -892,7 +897,7 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface RepositoryRegistry {
+	public interface RepositoryRegistry {
 
 		<T> SimpleGenericRepository<T> getFor(Class<T> entityType);
 	}
@@ -900,7 +905,7 @@ public class BridgeMethodResolverTests {
 
 	@SuppressWarnings("unchecked")
 	public static class SettableRepositoryRegistry<R extends SimpleGenericRepository<?>>
-					implements RepositoryRegistry {
+			implements RepositoryRegistry {
 
 		protected void injectInto(R rep) {
 		}
@@ -924,7 +929,7 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface ConvenientGenericRepository<T, ID extends Serializable>
+	public interface ConvenientGenericRepository<T, ID extends Serializable>
 			extends SimpleGenericRepository<T> {
 
 		T findById(ID id, boolean lock);
@@ -938,7 +943,7 @@ public class BridgeMethodResolverTests {
 
 
 	public static class GenericHibernateRepository<T, ID extends Serializable>
-					implements ConvenientGenericRepository<T, ID> {
+			implements ConvenientGenericRepository<T, ID> {
 
 		/**
 		 * @param c Mandatory. The domain class this repository is responsible for.
@@ -1018,7 +1023,7 @@ public class BridgeMethodResolverTests {
 	// SPR-2603 classes
 	//-------------------
 
-	public static interface Homer<E> {
+	public interface Homer<E> {
 
 		void foo(E e);
 	}
@@ -1043,18 +1048,17 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface GenericDao<T> {
+	public interface GenericDao<T> {
 
-		public void saveOrUpdate(T t);
+		void saveOrUpdate(T t);
 	}
 
 
-	public static interface ConvenienceGenericDao<T> extends GenericDao<T> {
+	public interface ConvenienceGenericDao<T> extends GenericDao<T> {
 	}
 
 
-	public static class GenericSqlMapDao<T extends Serializable> implements
+	public static class GenericSqlMapDao<T extends Serializable> implements ConvenienceGenericDao<T> {
-			ConvenienceGenericDao<T> {
 
 		@Override
 		public void saveOrUpdate(T t) {
@@ -1063,8 +1067,7 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static class GenericSqlMapIntegerDao<T extends Number> extends
+	public static class GenericSqlMapIntegerDao<T extends Number> extends GenericSqlMapDao<T> {
-			GenericSqlMapDao<T> {
 
 		@Override
 		public void saveOrUpdate(T t) {
@@ -1080,12 +1083,12 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface UserDao {
+	public interface UserDao {
 
-		//@Transactional
+		// @Transactional
 		void save(User user);
 
-		//@Transactional
+		// @Transactional
 		void save(Permission perm);
 	}
 
@@ -1112,8 +1115,9 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface DaoInterface<T, P> {
+	public interface DaoInterface<T, P> {
-			T get(P id);
+
+		T get(P id);
 	}
 
 
@@ -1166,13 +1170,13 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface MegaReceiver<E extends MegaEvent> {
+	public interface MegaReceiver<E extends MegaEvent> {
 
 		void receive(E event);
 	}
 
 
-	public static interface MegaMessageProducer extends MegaReceiver<MegaMessageEvent> {
+	public interface MegaMessageProducer extends MegaReceiver<MegaMessageEvent> {
 	}
 
 
@@ -1210,7 +1214,7 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface IGenericInterface<D extends DomainObjectSuper> {
+	public interface IGenericInterface<D extends DomainObjectSuper> {
 
 		<T> void doSomething(final D domainObject, final T value);
 	}
@@ -1275,7 +1279,7 @@ public class BridgeMethodResolverTests {
 	// SPR-3534 classes
 	//-------------------
 
-	public static interface SearchProvider<RETURN_TYPE, CONDITIONS_TYPE> {
+	public interface SearchProvider<RETURN_TYPE, CONDITIONS_TYPE> {
 
 		Collection<RETURN_TYPE> findBy(CONDITIONS_TYPE conditions);
 	}
@@ -1285,7 +1289,7 @@ public class BridgeMethodResolverTests {
 	}
 
 
-	public static interface IExternalMessageProvider<S extends ExternalMessage, T extends ExternalMessageSearchConditions<?>>
+	public interface IExternalMessageProvider<S extends ExternalMessage, T extends ExternalMessageSearchConditions<?>>
 			extends SearchProvider<S, T> {
 	}
 
@@ -1328,4 +1332,59 @@ public class BridgeMethodResolverTests {
 		}
 	}
 
+
+	//-------------------
+	// SPR-16103 classes
+	//-------------------
+
+	public static abstract class BaseEntity {
+
+		private String id;
+	}
+
+	public static class FooEntity extends BaseEntity {
+
+		private String name;
+	}
+
+	public static class BaseClass<T> {
+
+		public <S extends T> S test(S T) {
+			return null;
+		}
+	}
+
+	public static class EntityClass<T extends BaseEntity> extends BaseClass<T> {
+
+		@Override
+		public <S extends T> S test(S T) {
+			return null;
+		}
+	}
+
+	public static class FooClass extends EntityClass<FooEntity> {
+
+		@Override
+		public <S extends FooEntity> S test(S T) {
+			return null;
+		}
+	}
+
+	public interface BaseInterface<T> {
+
+		<S extends T> S test(S T);
+	}
+
+	public interface EntityInterface<T extends BaseEntity> extends BaseInterface<T> {
+
+		@Override
+		<S extends T> S test(S T);
+	}
+
+	public interface FooInterface extends EntityInterface<FooEntity> {
+
+		@Override
+		<S extends FooEntity> S test(S T);
+	}
+
 }