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Undertow, Tyrus, Jetty and even Tomcat all caused some breaking changes recently which we're currently working around through reflection and mock compilation. As of Spring Framework 5, we should bump up the minimum requirements to mid-2015 versions of those... as featured in WildFly 10, GlassFish 4.1.1, WebLogic 12.2.1 in the case of Undertow and Tyrus. This implies that Spring 5's WebSocket support won't work on WildFly 8/9, GlassFish 4.1.0 and WebLogic 12.1.3 anymore which should be acceptable in 2017.