Sun has decided to continue supporting Java 1.4.2, 5, and 6 for about 15 years under the rubric "Java SE for Business". As far as I can tell, this is just the regular JDK. You just download it from a different URL. I like the longer support (one major product at my current employer is just now moving off of 1.4.2 and won't be fully migrated for the indefinite future) though I confess I'm a little baffled as to why they felt obligated to give this a new moniker.