if you go the apt-get route you get a sha256sum mismatch on both java7 & java8. If you try to be clever and manually download it and throw it in the cache, same story. If you try to be really really clever and manually download it and try to manually extract the tar it throws a bunch of cannot create symlink: invalid argument errors. I spent a good 2+ hours trying to force it to install in various ways. For now at least it seems java is not meant to be on Windows Bash.