Im wanting to create a massive online community.

After reading and all I have started working on the java language, (not hard at all, since I know action really well) but the thing is after I read and thought about it, what would you write a massive online avatar chat community in, flash or java? Like which would you say would be faster. Im already working on the socket server in java (so I won't have to keep paying massive amounts of money just to expand to other servers).

So flash or Java?

Cedric