Are you sure you really need another <interface> or just a new working address?
Although maybe possible, I have yet to run into a situation that required a new interface, and it likely hardly makes much sense unless you really need to isolate your two loopback addresses.
If you don’t need another interface but need the additional address, AFAIK you only need to add to your Hosts file, by default the loopback interface should support the entire 127.0.0.0/8 address space by default.
Thanks for your reply. I need to run multiple instances of JBoss and I bind each one to a different loopback interface so they are not accessible from outside without having to tweak firewall settings.