The FTB Forum is now read-only, and is here as an archive.
To participate in our community discussions, please join our Discord! https://ftb.team/discord
Don't uninstall java keep it and install java 7 too, edit your start server bat file at at the start it should say java change the address to something like this with the quotation marks "C:\Program Files\Java\jre7\bin\java" your directory maybe different just look for it and copy the address...
