MarsSeed [1] filed a deletion request for jre12 [2]: Cleanup of deprecated JDK/JRE 12 non-LTS, short-term support packages.
Oracle JDK 12 is EOL since October 2019; extended/paid support for updates/fixes not available. Users should migrate to a newer JDK/JRE. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/jre12/
