The guide for JWS 5.1 on Openshift contains multiple references to tomcat 7 and tomcat 8, which are part of JWS 3.1; 5.1 contains tomcat 9.
https://access.redhat.com/documentation/en-us/red_hat_jboss_web_server/5.1/html/red_hat_jboss_web_server_for_openshift/index
We would need to update such references to reflect to the correct version.