apache-commons-validator from systemsmanagement:Uyuni:Stable project
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Add repository and install manually
For openSUSE Leap 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement:Uyuni:Stable/openSUSE_Leap_15.6/systemsmanagement:Uyuni:Stable.repo zypper refresh zypper install apache-commons-validator