AbstractFallbackTransactionAttributeSource's DefaultCacheKey takes targetClass into account (again)

Issue: SPR-12536
(cherry picked from commit c087e51)

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2014 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.
@@ -227,7 +227,7 @@ public abstract class AbstractFallbackTransactionAttributeSource implements Tran
 
 		@Override
 		public int hashCode() {
-			return this.method.hashCode();
+			return this.method.hashCode() + (this.targetClass != null ? this.targetClass.hashCode() * 29 : 0);
 		}
 	}