If I want to build a standalone EJB client which uses the HTTP transport, I have to explicitly add a dependency on io.undertow:undertow-core artifact, otherwise the client will fail with java.lang.ClassNotFoundException: io.undertow.util.AttachmentKey

I think that either the client should get rid of this dependency, or it should be included transitively, so that the only two required artifacts are org.jboss:jboss-ejb-client and org.wildfly.wildfly-http-client:wildfly-http-ejb-client so that the pom.xml can be shorter.