There are two issues with the Red Hat Enterprise Linux 8 install section in the the Installation Guide for JWS 5.3:

For Red Hat Enterprise Linux 8:

jws-5-for-rhel-8-server-rpms
jb-coreservices-1-for-rhel-8-server-rpms

1) The repository name is apparently incorrect. Instead of pointing to jws-5-for-rhel-8-server-rpms it appears that the packages are in repositories that include the arch in their name, like jws-5-for-rhel-8-x86_64-rpms. I guess the naming scheme changed between RHEL 7 and RHEL 8 but didn't get reflected in the docs.
2) We shouldn't be referencing JBCS here because the packages that tomcat-native (the only native library in JWS) require come from the RHEL repository rather than JBCS' in RHEL 8.

We should probably also adjust the note that says "The Red Hat JBoss Core Services repositories above are required for the installation of JBoss Web Server." to exclude RHEL 8