Minecraft does not run without sun-jdk-1.6

Minecraft does not run on Gentoo Linux 64bit without Java 1.6. When I try to run it. I get this error.

./run.minecraft.sh

• Home for VM 'sun-jdk-1.6' does not exist: /usr/lib/jvm/sun-jdk-1.6
• Invalid User VM: sun-jdk-1.6

I am going to add sun-jdk-1.6 again into Gentoo Linux, but it has been masked and is soon going to be removed from its portage system.