Hiplease delete the jtopen-jt400-jdbc3 [1] and jtopen-jt400-jdbc4 [2] packages as the upstream author doesn't provide anymore separate jdbc drivers for newer versions and the jtopen package is enough.
[1] https://aur.archlinux.org/packages/jtopen-jt400-jdbc3/ [2] https://aur.archlinux.org/packages/jtopen-jt400-jdbc4/ Best regards Muflone