For Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:fmccarthy:AI:pulsar:java:attic/Tumbleweed/home:fmccarthy:AI:pulsar:java:attic.repo
zypper refresh
zypper install apache-commons-configuration
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:fmccarthy:AI:pulsar:java:attic/15.6/home:fmccarthy:AI:pulsar:java:attic.repo
zypper refresh
zypper install apache-commons-configuration
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:fmccarthy:AI:pulsar:java:attic/15.4/home:fmccarthy:AI:pulsar:java:attic.repo
zypper refresh
zypper install apache-commons-configuration