MarsSeed [1] filed a deletion request for jre6 [2]: Proposal to delete this package. Java 6 JRE originally released in 2006, EOL since 2013. Source file 404. I don't think it's useful to keep.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/jre6/
