8013395: StringBuffer.toString performance regression impacting embedded benchmarks Summary: cache a copy of the char[] to use with toString() and clear it when ever the sb content is modified Reviewed-by: alanb, plevart, mduigou, forax

8014217: Base64.getXDecoder().wrap(...).read() doesn't throw exception for an incorrect number of padding chars in the final unit Summary: to throw IOE for malformed final unit in base64 stream Reviewed-by: chegar, alanb

8012326: Deadlock occurs when Charset.availableCharsets() is called by several threads at the same time Summary: removed the race condition risk from ExtendedCahrset access code Reviewed-by: mchung, alanb