Whenever you upgrade your Sun Java Runtime Environment (JRE) there are still leftovers in your system and they takeup space and are vurnerables for intruders to attack your machine. So in order to delete these files you could use this free app called JavaRa.
JavaRa is a free application that allows you to update your JRE to the latest version and also fully delete all old versions of Sun Java that are still in your system.
