Definition: A supernova represents the very final stages of evolution for (a) Sun. It is the final huge mass-loss stage of a dying high-mass Sun where the outer layers are ejected during the core's collapse to form a neutron star.
Ed Zander, Joe Shoemaker, Mike Lehman, Larry Hambly, and Stephen DeWitt all left Sun in the 1st half of 2002. This was more of a management shakeup then anything else and while the stock dropped from $14 to below $4, it didn't influence what was going on with Java all that much.
Moving fast forward 2 years, the Sun-Microsoft settlement seemed to have only little effect on the (NasdaqNM:SUNW) chart ($4 before the settlement was announced and $3.69 today) but the brain-drain had started, leaving Sun and Java somewhat demoralized state, one must assume:
It all started back in September:
Sept.9, 2003 Bill Joy, Chief Scientist, leaves Sun Microsystems.
April 5, 2004: Rich Green, VP of Developer Platforms, leaves Sun Microsystems.
April 20, 2004: Wolfgang Gentzsch, Gridcomputing Research Lead, leaves Sun Microsystems.
July 7, 2004: Joshua Bloch, Distinguished Engineer, leaves Sun Microsystems.
July 16, 2004: Peder Ulander, Linux Desktop Project Lead, leaves Sun Microsystems.
And then of course there are all the good hard working engineers that have left Sun without making the news ...