The http-custom-mechanism quickstart will need the following updates to work properly with the new out of the box configuration:

• The configure-security-domain.cli script tries to add an application-security-domain mapping in the Undertow subsystem
  that already exists in the out of the box configuration.
• Running mvn clean install from custom-module results in build failures due to missing dependency versions
  (the custom-module/pom.xml isn't using the BOM to get the versions).