If you’re running Java SE 6, we have some news for you: Oracle stopped providing public updates to it after February 2013.
Enterprise customers will still have access to long term help through their support channels.
For everyone else, you should upgrade to Java SE 7 and remove Java SE 6 – remember Java doesn’t remove older versions by default.
For those who may have missed it: Java SE 5 must be long gone. There’s no good reason to run it or Java 6 any more.