--- old/src/share/classes/java/lang/StringCoding.java	2012-05-29 10:41:15.000000000 -0700
+++ new/src/share/classes/java/lang/StringCoding.java	2012-05-29 10:41:15.000000000 -0700
@@ -250,6 +250,7 @@
     static char[] decode(byte[] ba, int off, int len) {
         String csn = Charset.defaultCharset().name();
         try {
+            // use charset name decode() variant which provides caching.
             return decode(csn, ba, off, len);
         } catch (UnsupportedEncodingException x) {
             warnUnsupportedCharset(csn);
@@ -382,6 +383,7 @@
     static byte[] encode(char[] ca, int off, int len) {
         String csn = Charset.defaultCharset().name();
         try {
+            // use charset name encode() variant which provides caching.
             return encode(csn, ca, off, len);
         } catch (UnsupportedEncodingException x) {
             warnUnsupportedCharset(csn);