Conclusion here on resteasy-dev list was, that we will use WildFly (not Undertow container). See this mail from Alessio: http://lists.jboss.org/pipermail/resteasy-dev/2016-May/000008.html2) I know we've talked about what to do with tjws, but I don't know if we reached a conclusion. This would be a good time to deprecate it, if we're going to do that.+1 to deprecate it and migrate our tests still using the tjws fully to RESTEasy's cool undertow container :-)