Skip transaction/caching metadata retrieval for java.lang.Object methods

Also retrieves CacheConfig as merged annotation now, aligned with other caching annotations.

Issue: SPR-15296

spring-tx/src/main/java/org/springframework/transaction/interceptor/AbstractFallbackTransactionAttributeSource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 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.
@@ -82,6 +82,10 @@ public abstract class AbstractFallbackTransactionAttributeSource implements Tran
 	 */
 	@Override
 	public TransactionAttribute getTransactionAttribute(Method method, Class<?> targetClass) {
+		if (method.getDeclaringClass() == Object.class) {
+			return null;
+		}
+
 		// First, see if we have a cached value.
 		Object cacheKey = getCacheKey(method, targetClass);
 		Object cached = this.attributeCache.get(cacheKey);