Unable to perform system update

I think this is the Java problem that Bryanpwo warned us about, you can read it here.

Edit:

you still have the community repo. There was a change in the repos months ago.

https://archlinux.org/news/git-migration-completed/

you should change your

/etc/pacman.conf

with the content of

if you use the standard repos. Of course, it’s best to create a backup before changing the file.