Merge pull request #97 from sbrannen/SPR-9493

* SPR-9493:
  Infer return type of parametrized factory methods

spring-beans/src/main/java/org/springframework/beans/factory/support/AbstractAutowireCapableBeanFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 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.
@@ -63,6 +63,7 @@ import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
 import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.beans.factory.config.BeanPostProcessor;
 import org.springframework.beans.factory.config.ConfigurableBeanFactory;
+import org.springframework.beans.factory.config.ConstructorArgumentValues.ValueHolder;
 import org.springframework.beans.factory.config.DependencyDescriptor;
 import org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessor;
 import org.springframework.beans.factory.config.SmartInstantiationAwareBeanPostProcessor;
@@ -106,6 +107,7 @@ import org.springframework.util.StringUtils;
  * @author Mark Fisher
  * @author Costin Leau
  * @author Chris Beams
+ * @author Sam Brannen
  * @since 13.02.2004
  * @see RootBeanDefinition
  * @see DefaultListableBeanFactory
@@ -628,16 +630,26 @@ public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFac
 			return null;
 		}
 
+		List<ValueHolder> argumentValues = mbd.getConstructorArgumentValues().getGenericArgumentValues();
+		Object[] args = new Object[argumentValues.size()];
+		for (int i = 0; i < args.length; i++) {
+			args[i] = argumentValues.get(i).getValue();
+		}
+
 		// If all factory methods have the same return type, return that type.
 		// Can't clearly figure out exact method due to type converting / autowiring!
 		int minNrOfArgs = mbd.getConstructorArgumentValues().getArgumentCount();
 		Method[] candidates = ReflectionUtils.getUniqueDeclaredMethods(factoryClass);
-		Set<Class> returnTypes = new HashSet<Class>(1);
+		Set<Class<?>> returnTypes = new HashSet<Class<?>>(1);
 		for (Method factoryMethod : candidates) {
-			if (Modifier.isStatic(factoryMethod.getModifiers()) == isStatic &&
-					factoryMethod.getName().equals(mbd.getFactoryMethodName()) &&
-					factoryMethod.getParameterTypes().length >= minNrOfArgs) {
-				returnTypes.add(factoryMethod.getReturnType());
+			if (Modifier.isStatic(factoryMethod.getModifiers()) == isStatic
+					&& factoryMethod.getName().equals(mbd.getFactoryMethodName())
+					&& factoryMethod.getParameterTypes().length >= minNrOfArgs) {
+
+				Class<?> returnType = GenericTypeResolver.resolveParameterizedReturnType(factoryMethod, args);
+				if (returnType != null) {
+					returnTypes.add(returnType);
+				}
 			}
 		}
 

spring-beans/src/test/java/org/springframework/beans/factory/support/BeanFactoryGenericsTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2012 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.
@@ -29,6 +29,8 @@ import java.util.Map;
 import java.util.Set;
 
 import static org.junit.Assert.*;
+
+import org.easymock.EasyMock;
 import org.junit.Test;
 import test.beans.GenericBean;
 import test.beans.GenericIntegerBean;
@@ -46,6 +48,7 @@ import org.springframework.core.io.UrlResource;
 /**
  * @author Juergen Hoeller
  * @author Chris Beams
+ * @author Sam Brannen
  * @since 20.01.2006
  */
 public class BeanFactoryGenericsTests {
@@ -619,6 +622,30 @@ public class BeanFactoryGenericsTests {
 		assertEquals(new URL("http://www.springframework.org"), us.iterator().next());
 	}
 
+	/**
+	 * Tests support for parameterized {@code factory-method} declarations such
+	 * as EasyMock's {@code createMock()} method which has the following signature.
+	 *
+	 * <pre>{@code
+	 * public static <T> T createMock(Class<T> toMock)
+	 * }</pre>
+	 *
+	 * @since 3.2
+	 * @see SPR-9493
+	 */
+	@Test
+	public void parameterizedFactoryMethod() {
+		RootBeanDefinition rbd = new RootBeanDefinition(EasyMock.class);
+		rbd.setFactoryMethodName("createMock");
+		rbd.getConstructorArgumentValues().addGenericArgumentValue(Runnable.class);
+
+		DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
+		bf.registerBeanDefinition("easyMock", rbd);
+
+		Map<String, Runnable> beans = bf.getBeansOfType(Runnable.class);
+		assertEquals(1, beans.size());
+	}
+
 
 	@SuppressWarnings("serial")
 	public static class NamedUrlList extends LinkedList<URL> {

spring-beans/src/test/java/org/springframework/beans/factory/xml/FactoryMethodTests.java

@@ -28,7 +28,6 @@ import test.beans.TestBean;
 import org.springframework.beans.factory.BeanCreationException;
 import org.springframework.beans.factory.BeanDefinitionStoreException;
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
-import org.springframework.core.LocalVariableTableParameterNameDiscoverer;
 import org.springframework.core.io.ClassPathResource;
 
 /**

spring-beans/src/test/resources/log4j.xml

@@ -19,6 +19,10 @@
 		<level value="debug" />
 	</logger>
 
+	<logger name="org.springframework.core.GenericTypeResolver">
+		<level value="warn" />
+	</logger>
+
 	<!-- Root Logger -->
 	<root>
 		<priority value="warn" />

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 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.
@@ -30,7 +30,11 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.WeakHashMap;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
 import org.springframework.util.Assert;
+import org.springframework.util.ObjectUtils;
 
 /**
  * Helper class for resolving generic types against type variables.
@@ -40,11 +44,14 @@ import org.springframework.util.Assert;
  *
  * @author Juergen Hoeller
  * @author Rob Harrop
+ * @author Sam Brannen
  * @since 2.5.2
  * @see GenericCollectionTypeResolver
  */
 public abstract class GenericTypeResolver {
 
+	private static final Log logger = LogFactory.getLog(GenericTypeResolver.class);
+
 	/** Cache from Class to TypeVariable Map */
 	private static final Map<Class, Reference<Map<TypeVariable, Type>>> typeVariableCache =
 			Collections.synchronizedMap(new WeakHashMap<Class, Reference<Map<TypeVariable, Type>>>());
@@ -88,18 +95,144 @@ public abstract class GenericTypeResolver {
 	}
 
 	/**
-	 * Determine the target type for the generic return type of the given method.
+	 * Determine the target type for the generic return type of the given method,
+	 * where the type variable is declared on the given class.
+	 *
 	 * @param method the method to introspect
 	 * @param clazz the class to resolve type variables against
 	 * @return the corresponding generic parameter or return type
+	 * @see #resolveParameterizedReturnType
 	 */
-	public static Class<?> resolveReturnType(Method method, Class clazz) {
+	public static Class<?> resolveReturnType(Method method, Class<?> clazz) {
 		Assert.notNull(method, "Method must not be null");
 		Type genericType = method.getGenericReturnType();
 		Assert.notNull(clazz, "Class must not be null");
 		Map<TypeVariable, Type> typeVariableMap = getTypeVariableMap(clazz);
 		Type rawType = getRawType(genericType, typeVariableMap);
-		return (rawType instanceof Class ? (Class) rawType : method.getReturnType());
+		return (rawType instanceof Class ? (Class<?>) rawType : method.getReturnType());
+	}
+
+	/**
+	 * Determine the target type for the generic return type of the given
+	 * <em>parameterized</em> method, where the type variable is declared
+	 * on the given method.
+	 *
+	 * <p>For example, given a factory method with the following signature,
+	 * if {@code resolveParameterizedReturnType()} is invoked with the reflected
+	 * method for {@code creatProxy()} and an {@code Object[]} array containing
+	 * {@code MyService.class}, {@code resolveParameterizedReturnType()} will
+	 * infer that the target return type is {@code MyService}.
+	 *
+	 * <pre>{@code public static <T> T createProxy(Class<T> clazz)}</pre>
+	 *
+	 * <h4>Possible Return Values</h4>
+	 * <ul>
+	 * <li>the target return type if it can be inferred</li>
+	 * <li>the {@link Method#getReturnType() standard return type}, if
+	 * the given {@code method} does not declare any {@link
+	 * Method#getTypeParameters() generic types}</li>
+	 * <li>the {@link Method#getReturnType() standard return type}, if the
+	 * target return type cannot be inferred (e.g., due to type erasure)</li>
+	 * <li>{@code null}, if the length of the given arguments array is shorter
+	 * than the length of the {@link
+	 * Method#getGenericParameterTypes() formal argument list} for the given
+	 * method</li>
+	 * </ul>
+	 *
+	 * @param method the method to introspect, never {@code null}
+	 * @param args the arguments that will be supplied to the method when it is
+	 * invoked, never {@code null}
+	 * @return the resolved target return type, the standard return type, or
+	 * {@code null}
+	 * @since 3.2
+	 * @see #resolveReturnType
+	 */
+	public static Class<?> resolveParameterizedReturnType(Method method, Object[] args) {
+		Assert.notNull(method, "method must not be null");
+		Assert.notNull(args, "args must not be null");
+
+		final TypeVariable<Method>[] declaredGenericTypes = method.getTypeParameters();
+		final Type genericReturnType = method.getGenericReturnType();
+		final Type[] genericArgumentTypes = method.getGenericParameterTypes();
+
+		if (logger.isDebugEnabled()) {
+			logger.debug(String.format(
+				"Resolving parameterized return type for [%s] with concrete method arguments [%s].",
+				method.toGenericString(), ObjectUtils.nullSafeToString(args)));
+		}
+
+		// No declared generic types to inspect, so just return the standard return type.
+		if (declaredGenericTypes.length == 0) {
+			return method.getReturnType();
+		}
+
+		// The supplied argument list is too short for the method's signature, so
+		// return null, since such a method invocation would fail.
+		if (args.length < genericArgumentTypes.length) {
+			return null;
+		}
+
+		// Ensure that the generic type is declared directly on the method
+		// itself, not on the enclosing class or interface.
+		boolean locallyDeclaredGenericTypeMatchesReturnType = false;
+		for (TypeVariable<Method> currentType : declaredGenericTypes) {
+			if (currentType.equals(genericReturnType)) {
+				if (logger.isDebugEnabled()) {
+					logger.debug(String.format(
+						"Found declared generic type [%s] that matches the target return type [%s].",
+						currentType, genericReturnType));
+				}
+				locallyDeclaredGenericTypeMatchesReturnType = true;
+				break;
+			}
+		}
+
+		if (locallyDeclaredGenericTypeMatchesReturnType) {
+			for (int i = 0; i < genericArgumentTypes.length; i++) {
+				final Type currentArgumentType = genericArgumentTypes[i];
+
+				if (currentArgumentType.equals(genericReturnType)) {
+					if (logger.isDebugEnabled()) {
+						logger.debug(String.format(
+							"Found generic method argument at index [%s] that matches the target return type.", i));
+					}
+					return args[i].getClass();
+				}
+
+				if (currentArgumentType instanceof ParameterizedType) {
+					ParameterizedType parameterizedType = (ParameterizedType) currentArgumentType;
+					Type[] actualTypeArguments = parameterizedType.getActualTypeArguments();
+
+					for (int j = 0; j < actualTypeArguments.length; j++) {
+						final Type typeArg = actualTypeArguments[j];
+
+						if (typeArg.equals(genericReturnType)) {
+							if (logger.isDebugEnabled()) {
+								logger.debug(String.format(
+									"Found method argument at index [%s] that is parameterized with a type that matches the target return type.",
+									i));
+							}
+
+							if (args[i] instanceof Class) {
+								return (Class<?>) args[i];
+							} else {
+								// Consider adding logic to determine the class of the
+								// J'th typeArg, if possible.
+								logger.info(String.format(
+									"Could not determine the target type for parameterized type [%s] for method [%s].",
+									typeArg, method.toGenericString()));
+
+								// For now, just fall back...
+								return method.getReturnType();
+							}
+						}
+					}
+				}
+			}
+		}
+
+		// Fall back...
+		return method.getReturnType();
 	}
 
 	/**
@@ -128,7 +261,7 @@ public abstract class GenericTypeResolver {
 				return null;
 			}
 		}
-		return GenericTypeResolver.resolveTypeArgument((Class<?>) returnType, genericIfc);
+		return resolveTypeArgument((Class<?>) returnType, genericIfc);
 	}
 
 	/**
@@ -186,7 +319,7 @@ public abstract class GenericTypeResolver {
 		}
 		return null;
 	}
-	
+
 	private static Class[] doResolveTypeArguments(Class ownerClass, Type ifc, Class genericIfc) {
 		if (ifc instanceof ParameterizedType) {
 			ParameterizedType paramIfc = (ParameterizedType) ifc;
@@ -236,7 +369,6 @@ public abstract class GenericTypeResolver {
 		return (arg instanceof Class ? (Class) arg : Object.class);
 	}
 
-
 	/**
 	 * Resolve the specified generic type against the given TypeVariable map.
 	 * @param genericType the generic type to resolve
@@ -272,9 +404,9 @@ public abstract class GenericTypeResolver {
 	}
 
 	/**
-	 * Build a mapping of {@link TypeVariable#getName TypeVariable names} to concrete
-	 * {@link Class} for the specified {@link Class}. Searches all super types,
-	 * enclosing types and interfaces.
+	 * Build a mapping of {@link TypeVariable#getName TypeVariable names} to
+	 * {@link Class concrete classes} for the specified {@link Class}. Searches
+	 * all super types, enclosing types and interfaces.
 	 */
 	public static Map<TypeVariable, Type> getTypeVariableMap(Class clazz) {
 		Reference<Map<TypeVariable, Type>> ref = typeVariableCache.get(clazz);

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 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.
@@ -16,51 +16,116 @@
 
 package org.springframework.core;
 
+import java.lang.reflect.Method;
+
 import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
 
 import org.junit.Test;
 
-import org.springframework.util.ReflectionUtils;
-
 import static org.junit.Assert.*;
 
+import static org.springframework.core.GenericTypeResolver.*;
+import static org.springframework.util.ReflectionUtils.*;
+
 /**
  * @author Juergen Hoeller
+ * @author Sam Brannen
  */
 public class GenericTypeResolverTests {
 
 	@Test
-	public void testSimpleInterfaceType() {
-		assertEquals(String.class, GenericTypeResolver.resolveTypeArgument(MySimpleInterfaceType.class, MyInterfaceType.class));
+	public void simpleInterfaceType() {
+		assertEquals(String.class, resolveTypeArgument(MySimpleInterfaceType.class, MyInterfaceType.class));
 	}
 
 	@Test
-	public void testSimpleCollectionInterfaceType() {
-		assertEquals(Collection.class, GenericTypeResolver.resolveTypeArgument(MyCollectionInterfaceType.class, MyInterfaceType.class));
+	public void simpleCollectionInterfaceType() {
+		assertEquals(Collection.class, resolveTypeArgument(MyCollectionInterfaceType.class, MyInterfaceType.class));
 	}
 
 	@Test
-	public void testSimpleSuperclassType() {
-		assertEquals(String.class, GenericTypeResolver.resolveTypeArgument(MySimpleSuperclassType.class, MySuperclassType.class));
+	public void simpleSuperclassType() {
+		assertEquals(String.class, resolveTypeArgument(MySimpleSuperclassType.class, MySuperclassType.class));
 	}
 
 	@Test
-	public void testSimpleCollectionSuperclassType() {
-		assertEquals(Collection.class, GenericTypeResolver.resolveTypeArgument(MyCollectionSuperclassType.class, MySuperclassType.class));
+	public void simpleCollectionSuperclassType() {
+		assertEquals(Collection.class, resolveTypeArgument(MyCollectionSuperclassType.class, MySuperclassType.class));
 	}
 
 	@Test
-	public void testMethodReturnType() {
-		assertEquals(Integer.class, GenericTypeResolver.resolveReturnTypeArgument(ReflectionUtils.findMethod(MyTypeWithMethods.class, "integer"), MyInterfaceType.class));
-		assertEquals(String.class, GenericTypeResolver.resolveReturnTypeArgument(ReflectionUtils.findMethod(MyTypeWithMethods.class, "string"), MyInterfaceType.class));
-		assertEquals(null, GenericTypeResolver.resolveReturnTypeArgument(ReflectionUtils.findMethod(MyTypeWithMethods.class, "raw"), MyInterfaceType.class));
-		assertEquals(null, GenericTypeResolver.resolveReturnTypeArgument(ReflectionUtils.findMethod(MyTypeWithMethods.class, "object"), MyInterfaceType.class));
+	public void nullIfNotResolvable() {
+		GenericClass<String> obj = new GenericClass<String>();
+		assertNull(resolveTypeArgument(obj.getClass(), GenericClass.class));
 	}
 
 	@Test
-	public void testNullIfNotResolvable() {
-		GenericClass<String> obj = new GenericClass<String>();
-		assertNull(GenericTypeResolver.resolveTypeArgument(obj.getClass(), GenericClass.class));
+	public void methodReturnTypes() {
+		assertEquals(Integer.class, resolveReturnTypeArgument(findMethod(MyTypeWithMethods.class, "integer"), MyInterfaceType.class));
+		assertEquals(String.class, resolveReturnTypeArgument(findMethod(MyTypeWithMethods.class, "string"), MyInterfaceType.class));
+		assertEquals(null, resolveReturnTypeArgument(findMethod(MyTypeWithMethods.class, "raw"), MyInterfaceType.class));
+		assertEquals(null, resolveReturnTypeArgument(findMethod(MyTypeWithMethods.class, "object"), MyInterfaceType.class));
+	}
+
+	/**
+	 * @since 3.2
+	 */
+	@Test
+	public void parameterizedMethodReturnTypes() {
+
+		Method notParameterized = findMethod(MyTypeWithMethods.class, "notParameterized", new Class[] {});
+		assertEquals(String.class, resolveParameterizedReturnType(notParameterized, new Object[] {}));
+
+		Method notParameterizedWithArguments = findMethod(MyTypeWithMethods.class, "notParameterizedWithArguments",
+			new Class[] { Integer.class, Boolean.class });
+		assertEquals(String.class,
+			resolveParameterizedReturnType(notParameterizedWithArguments, new Object[] { 99, true }));
+
+		Method createProxy = findMethod(MyTypeWithMethods.class, "createProxy", new Class[] { Object.class });
+		assertEquals(String.class, resolveParameterizedReturnType(createProxy, new Object[] { "foo" }));
+
+		Method createNamedProxyWithDifferentTypes = findMethod(MyTypeWithMethods.class, "createNamedProxy",
+			new Class[] { String.class, Object.class });
+		// one argument to few
+		assertNull(resolveParameterizedReturnType(createNamedProxyWithDifferentTypes, new Object[] { "enigma" }));
+		assertEquals(Long.class,
+			resolveParameterizedReturnType(createNamedProxyWithDifferentTypes, new Object[] { "enigma", 99L }));
+
+		Method createNamedProxyWithDuplicateTypes = findMethod(MyTypeWithMethods.class, "createNamedProxy",
+			new Class[] { String.class, Object.class });
+		assertEquals(String.class,
+			resolveParameterizedReturnType(createNamedProxyWithDuplicateTypes, new Object[] { "enigma", "foo" }));
+
+		Method createMock = findMethod(MyTypeWithMethods.class, "createMock", new Class[] { Class.class });
+		assertEquals(Runnable.class, resolveParameterizedReturnType(createMock, new Object[] { Runnable.class }));
+
+		Method createNamedMock = findMethod(MyTypeWithMethods.class, "createNamedMock", new Class[] { String.class,
+			Class.class });
+		assertEquals(Runnable.class,
+			resolveParameterizedReturnType(createNamedMock, new Object[] { "foo", Runnable.class }));
+
+		Method createVMock = findMethod(MyTypeWithMethods.class, "createVMock",
+			new Class[] { Object.class, Class.class });
+		assertEquals(Runnable.class,
+			resolveParameterizedReturnType(createVMock, new Object[] { "foo", Runnable.class }));
+
+		// Ideally we would expect String.class instead of Object.class, but
+		// resolveParameterizedReturnType() does not currently support this form of
+		// look-up.
+		Method extractValueFrom = findMethod(MyTypeWithMethods.class, "extractValueFrom",
+			new Class[] { MyInterfaceType.class });
+		assertEquals(Object.class,
+			resolveParameterizedReturnType(extractValueFrom, new Object[] { new MySimpleInterfaceType() }));
+
+		// Ideally we would expect Boolean.class instead of Object.class, but this
+		// information is not available at run-time due to type erasure.
+		Map<Integer, Boolean> map = new HashMap<Integer, Boolean>();
+		map.put(0, false);
+		map.put(1, true);
+		Method extractMagicValue = findMethod(MyTypeWithMethods.class, "extractMagicValue", new Class[] { Map.class });
+		assertEquals(Object.class, resolveParameterizedReturnType(extractMagicValue, new Object[] { map }));
 	}
 
 
@@ -73,7 +138,6 @@ public class GenericTypeResolverTests {
 	public class MyCollectionInterfaceType implements MyInterfaceType<Collection<String>> {
 	}
 
-
 	public abstract class MySuperclassType<T> {
 	}
 
@@ -83,12 +147,70 @@ public class GenericTypeResolverTests {
 	public class MyCollectionSuperclassType extends MySuperclassType<Collection<String>> {
 	}
 
-	public class MyTypeWithMethods {
+	public static class MyTypeWithMethods {
 		public MyInterfaceType<Integer> integer() { return null; }
 		public MySimpleInterfaceType string() { return null; }
 		public Object object() { return null; }
 		@SuppressWarnings("rawtypes")
 		public MyInterfaceType raw() { return null; }
+		public String notParameterized() { return null; }
+		public String notParameterizedWithArguments(Integer x, Boolean b) { return null; }
+
+		/**
+		 * Simulates a factory method that wraps the supplied object in a proxy
+		 * of the same type.
+		 */
+		public static <T> T createProxy(T object) {
+			return null;
+		}
+
+		/**
+		 * Similar to {@link #createProxy(Object)} but adds an additional argument
+		 * before the argument of type {@code T}. Note that they may potentially 
+		 * be of the same time when invoked!
+		 */
+		public static <T> T createNamedProxy(String name, T object) {
+			return null;
+		}
+
+		/**
+		 * Simulates factory methods found in libraries such as Mockito and EasyMock.
+		 */
+		public static <MOCK> MOCK createMock(Class<MOCK> toMock) {
+			return null;
+		}
+
+		/**
+		 * Similar to {@link #createMock(Class)} but adds an additional method 
+		 * argument before the parameterized argument.
+		 */
+		public static <T> T createNamedMock(String name, Class<T> toMock) {
+			return null;
+		}
+
+		/**
+		 * Similar to {@link #createNamedMock(String, Class)} but adds an additional
+		 * parameterized type.
+		 */
+		public static <V extends Object, T> T createVMock(V name, Class<T> toMock) {
+			return null;
+		}
+
+		/**
+		 * Extract some value of the type supported by the interface (i.e., by
+		 * a concrete, non-generic implementation of the interface).
+		 */
+		public static <T> T extractValueFrom(MyInterfaceType<T> myInterfaceType) {
+			return null;
+		}
+
+		/**
+		 * Extract some magic value from the supplied map.
+		 */
+		public static <K, V> V extractMagicValue(Map<K, V> map) {
+			return null;
+		}
+
 	}
 
 	static class GenericClass<T> {

spring-core/src/test/resources/log4j.xml

@@ -15,6 +15,10 @@
 		<level value="warn" />
 	</logger>
 
+	<logger name="org.springframework.core.GenericTypeResolver">
+		<level value="warn" />
+	</logger>
+
 	<!-- Root Logger -->
 	<root>
 		<priority value="warn" />