Jar__

Hey there. I'm fairly new to Technic Launcher, and I've come across a bug with Tekkit. What happens is I go onto the launcher and go to Tekkit, then click play. It loads in the loading bar thing for a few seconds but once everything's finished, nothing opens. I think it may be because I updated Java, and if so can you guys tell me which Java version and update I need to have to make this work properly? I'm on a Windows 8 computer.