These modules are consumed by both wildfly-clustering-tomcat and wildfly-clustering-spring-session which are meant to run outside of WildFly, which requires fragile exclusions so as not to inadvertently pull in WildFly specific dependencies.
In general, there are 2 types of classes that rely on org.jboss.as.controller and org.jboss.as.server:

• The ServiceConfigurator instances that configures a SessionManagerFactory service.
  • These can move to the org.wildfly.clustering.web.extension module
• The legacy ServiceConfigurator implementation that configures a SessionManagerFactory service in the absence of the distributable-web subsystem.
  • These should move to separate modules