Sun used to go after companies using "Java" in their names. Even events haven't been spared: Javapolis (in Belgium), where even Gosling came to speak, got renamed "Devoxx" due to trademark issues.
I somehow doubt that the french person who registered java-0day.com is in compliance.
The idea isn't bad but it's a bad sad that everything is put together: mixing Java applets exploits with server-side exploit with regulard client-side / Java desktop exploits.