The following (very old) documentation applies to this image

https://access.redhat.com/documentation/en-us/red_hat_jboss_middleware_for_openshift/3/html/red_hat_java_s2i_for_openshift/index

with (at least) the following caveats or substitutions

Author is out of date Red Hat JBoss Middleware for OpenShift Documentation Team xpaas-docs@redhat.com
any reference to JDK 1.8 or 8 should be JDK11
any reference to redhat-openjdk18-openshift should be replaced with ubi8/openjdk-11
all the oc commands need to be double-checked to make sure they are still valid for OCP 4.x
Table 5.1. Technologies used and their version is out of date (shold be JDK 11, Jolokia 1.6.2, Maven 3.6,
5.2. Information Environment Variables should be re-populated by checking the output of "podman inspect" on the current image
like wise 5.3. Configuration Environment Variables
I think 3.3. Build using the Web Console is correct but the animated GIF screenshots reflect the old OpenShift version