Currently, the configuration for Undertow is different than what is used in EAP 6.

Deployments are required to provide a META-INF/services/io.undertow.servlet.ServletExtension in order to activate the PicketLink extension and enabled it as a Service Provider.

However, this is not necessary because extensions can be loaded directly from PicketLink's modules in WildFly making the configuration more simple and similar to EAP 6.