reduced BeanDefinition footprint by initializing Sets and Maps with 0 (SPR-7491)

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2008 the original author or authors.
+ * Copyright 2002-2011 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.
@@ -35,7 +35,7 @@ import org.springframework.util.Assert;
 public abstract class AttributeAccessorSupport implements AttributeAccessor, Serializable {
 
 	/** Map with String keys and Object values */
-	private final Map<String, Object> attributes = new LinkedHashMap<String, Object>();
+	private final Map<String, Object> attributes = new LinkedHashMap<String, Object>(0);
 
 
 	public void setAttribute(String name, Object value) {