diff -r c78acf6c2f3e -r fcf89720ae71 src/share/classes/com/sun/tools/javac/util/MandatoryWarningHandler.java
--- a/src/share/classes/com/sun/tools/javac/util/MandatoryWarningHandler.java	Mon Dec 10 12:10:50 2012 +0000
+++ b/src/share/classes/com/sun/tools/javac/util/MandatoryWarningHandler.java	Mon Dec 10 16:21:26 2012 +0000
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -91,7 +91,7 @@
         DeferredDiagnosticKind(String v) { value = v; }
         String getKey(String prefix) { return prefix + value; }
 
-        private String value;
+        private final String value;
     }