On January 21, 2011 the
for OpenJDK 6 b21 was published.
Major changes include the latest round of security fixes and, courtesy Andrew John Hughes, syncing in HotSpot 19. In addition,
jaxp was upgraded to 1.4.4, Kelly removed the binary plug logic, some stray rebranding issues were corrected, Jon Gibbons backported a set of
JavaFileManager fixes from JDK 7, and the usual sorts of small backports of fixes from JDK 7 occurred too.
A detailed list of all the changes in b21 is also available.