--- a/jdk/src/share/classes/javax/swing/text/html/MinimalHTMLWriter.java	Tue Nov 02 15:08:56 2010 +0900
+++ b/jdk/src/share/classes/javax/swing/text/html/MinimalHTMLWriter.java	Tue Nov 02 13:32:00 2010 +0300
@@ -691,11 +691,11 @@
         if (styleNameMapping == null) {
             return style;
         }
-        StringBuffer sb = null;
+        StringBuilder sb = null;
         for (int counter = style.length() - 1; counter >= 0; counter--) {
             if (!isValidCharacter(style.charAt(counter))) {
                 if (sb == null) {
-                    sb = new StringBuffer(style);
+                    sb = new StringBuilder(style);
                 }
                 sb.setCharAt(counter, 'a');
             }