Wildfire 3.0.1 @ amd64?

I have amd64 gentoo system.

it has java 1.4.2

is it safe to use rpm with bundeled java 1.5.0 on amd64 (x86_64) system ?

It is safe to use rpm with boundled java, but boundled java is 32bit and will not use whole power of your processor. Better solution is to install java distribution for your processor and configure wildfire to use it.