one of my friends had this problem which was a big deal since I just converted my server from Tekkit to Tekkit lite. We got it fixed today. it's not a java issue, it's a problem with the launcher. I had him delete the .techniclauncher directory and re download the launcher and it worked fine for him after that. But if you do this remember to backup and single player saves you have before hand.
Tekkit Lite/Voltz/Technic Crash during Hello World on PC
in Technic Launcher
Posted
This worked for me !
Now i finally can play voltz :D