diff --git a/org.springframework.context/src/main/java/org/springframework/cache/interceptor/ExpressionEvaluator.java b/org.springframework.context/src/main/java/org/springframework/cache/interceptor/ExpressionEvaluator.java
index 3e989408d4..183ff1a053 100644
--- a/org.springframework.context/src/main/java/org/springframework/cache/interceptor/ExpressionEvaluator.java
+++ b/org.springframework.context/src/main/java/org/springframework/cache/interceptor/ExpressionEvaluator.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 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.
@@ -39,16 +39,16 @@ import org.springframework.expression.spel.standard.SpelExpressionParser;
  */
 class ExpressionEvaluator {
 
-	private SpelExpressionParser parser = new SpelExpressionParser();
+	private final SpelExpressionParser parser = new SpelExpressionParser();
 
 	// shared param discoverer since it caches data internally
-	private ParameterNameDiscoverer paramNameDiscoverer = new LocalVariableTableParameterNameDiscoverer();
+	private final ParameterNameDiscoverer paramNameDiscoverer = new LocalVariableTableParameterNameDiscoverer();
 
-	private Map<String, Expression> conditionCache = new ConcurrentHashMap<String, Expression>();
+	private final Map<String, Expression> conditionCache = new ConcurrentHashMap<String, Expression>();
 
-	private Map<String, Expression> keyCache = new ConcurrentHashMap<String, Expression>();
+	private final Map<String, Expression> keyCache = new ConcurrentHashMap<String, Expression>();
 
-	private Map<String, Method> targetMethodCache = new ConcurrentHashMap<String, Method>();
+	private final Map<String, Method> targetMethodCache = new ConcurrentHashMap<String, Method>();
 
 
 	public EvaluationContext createEvaluationContext(