diff -r c78acf6c2f3e -r fcf89720ae71 src/share/classes/com/sun/tools/doclets/internal/toolkit/util/DocFileFactory.java
--- a/src/share/classes/com/sun/tools/doclets/internal/toolkit/util/DocFileFactory.java	Mon Dec 10 12:10:50 2012 +0000
+++ b/src/share/classes/com/sun/tools/doclets/internal/toolkit/util/DocFileFactory.java	Mon Dec 10 16:21:26 2012 +0000
@@ -46,7 +46,7 @@
  * @since 1.8
  */
 abstract class DocFileFactory {
-    private static Map<Configuration, DocFileFactory> factories =
+    private static final Map<Configuration, DocFileFactory> factories =
             new WeakHashMap<Configuration, DocFileFactory>();
 
     /**