Undertow appears to require explicit keywords implements WebApplicationInitializer ---------------------------------------------------------------------------------- Key: WFLY-7089 URL: https://issues.jboss.org/browse/WFLY-7089 Project: WildFly Issue Type: Feature Request Components: Web (Undertow) Affects Versions: 10.1.0.Final Reporter: Darryl Miles Assignee: Stuart Douglas Undertow appears to require explicit keywords implements WebApplicationInitializer set on WEB-INF/classes when the class is using an "extends AbstractBaseClassThatImplementWebApplicationInitializer". It does not appear to see the annotation set on the base class AbstractBaseClassThatImplementWebApplicationInitializer. More over in my particular scenario this base class is provided in a JAR that is inside the EAR (not the WAR). Maybe what Wildfly is doing is completely specification compliant and other Servlet implementations work differently.