or something like this if you truly need a very high read rate and can stand updates not being reflected immediately: http://mina.apache.org/report/trunk/apido

or something like this if you truly need a very high read rate and can stand updates not being reflected immediately: http://mina.apache.org/report/trunk/apidocs/org/apache/mina/util/CopyOnWriteMap.html http://mina.apache.org/report/trunk/apidocs/org/apache/mina/... (although I believe ehcache can do this, ehcache is so tested and widely used that I would seriously look there first)