PropertySource implementations perform conversion to String arrays via StringUtils (getting rid of EMPTY_NAMES_ARRAY)

spring-core/src/main/java/org/springframework/core/env/EnumerablePropertySource.java

@@ -45,8 +45,6 @@ import org.springframework.util.Assert;
  */
 public abstract class EnumerablePropertySource<T> extends PropertySource<T> {
 
-	protected static final String[] EMPTY_NAMES_ARRAY = new String[0];
-
 	protected final Log logger = LogFactory.getLog(getClass());
 
 

spring-core/src/main/java/org/springframework/core/env/MapPropertySource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 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.
@@ -18,6 +18,8 @@ package org.springframework.core.env;
 
 import java.util.Map;
 
+import org.springframework.util.StringUtils;
+
 /**
  * {@link PropertySource} that reads keys and values from a {@code Map} object.
  *
@@ -38,7 +40,7 @@ public class MapPropertySource extends EnumerablePropertySource<Map<String, Obje
 
 	@Override
 	public String[] getPropertyNames() {
-		return this.source.keySet().toArray(EMPTY_NAMES_ARRAY);
+		return StringUtils.toStringArray(this.source.keySet());
 	}
 
 }

spring-core/src/main/java/org/springframework/core/env/MutablePropertySources.java

@@ -21,6 +21,7 @@ import java.util.LinkedList;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+
 import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
 
@@ -187,7 +188,7 @@ public class MutablePropertySources implements PropertySources {
 	}
 
 	@Override
-	public synchronized String toString() {
+	public String toString() {
 		String[] names = new String[this.size()];
 		for (int i=0; i < size(); i++) {
 			names[i] = this.propertySourceList.get(i).getName();