This has been created to track what discussed pre XP 2 GA, see [1] and following comments:

• "6.2. Provisioning user-developed layers in JBoss EAP" -> "NOTE" - custom layers not supported for Bootable JAR, just on OCP

[1]
https://issues.redhat.com/browse/EAP7-1444?focusedCommentId=15634465&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-15634465