LocalVariableTableParameterNameDiscoverer works for bridge methods as well

Issue: SPR-9429

org.springframework.core/src/main/java/org/springframework/core/LocalVariableTableParameterNameDiscoverer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2010 the original author or authors.
+ * Copyright 2002-2013 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.
@@ -39,12 +39,11 @@ import org.springframework.util.ClassUtils;
 /**
  * Implementation of {@link ParameterNameDiscoverer} that uses the LocalVariableTable
  * information in the method attributes to discover parameter names. Returns
- * <code>null</code> if the class file was compiled without debug information.
+ * {@code null} if the class file was compiled without debug information.
  *
- * <p>Uses ObjectWeb's ASM library for analyzing class files. Each discoverer
+ * <p>Uses ObjectWeb's ASM library for analyzing class files. Each discoverer instance
- * instance caches the ASM discovered information for each introspected Class, in a
+ * caches the ASM discovered information for each introspected Class, in a thread-safe
- * thread-safe manner. It is recommended to reuse discoverer instances
+ * manner. It is recommended to reuse ParameterNameDiscoverer instances as far as possible.
- * as far as possible.
  *
  * @author Adrian Colyer
  * @author Costin Leau
@@ -64,15 +63,15 @@ public class LocalVariableTableParameterNameDiscoverer implements ParameterNameD
 
 
 	public String[] getParameterNames(Method method) {
-		Class<?> declaringClass = method.getDeclaringClass();
+		Method originalMethod = BridgeMethodResolver.findBridgedMethod(method);
+		Class<?> declaringClass = originalMethod.getDeclaringClass();
 		Map<Member, String[]> map = this.parameterNamesCache.get(declaringClass);
 		if (map == null) {
-			// initialize cache
 			map = inspectClass(declaringClass);
 			this.parameterNamesCache.put(declaringClass, map);
 		}
 		if (map != NO_DEBUG_INFO_MAP) {
-			return map.get(method);
+			return map.get(originalMethod);
 		}
 		return null;
 	}
@@ -82,14 +81,12 @@ public class LocalVariableTableParameterNameDiscoverer implements ParameterNameD
 		Class<?> declaringClass = ctor.getDeclaringClass();
 		Map<Member, String[]> map = this.parameterNamesCache.get(declaringClass);
 		if (map == null) {
-			// initialize cache
 			map = inspectClass(declaringClass);
 			this.parameterNamesCache.put(declaringClass, map);
 		}
 		if (map != NO_DEBUG_INFO_MAP) {
 			return map.get(ctor);
 		}
-
 		return null;
 	}