Clojurians Log v2

Is anybody using async handlers in an uberwar with Tomcat? It works fine for us when run with lein ring server but when running out of a servlet under Tomcat, we see this :

15-Oct-2019 20:17:22.932 WARNING [http-nio-8080-exec-3] org.apache.catalina.connector.Request.startAsync Unable to start async because the following classes in the processing chain do not support async [apij.servlet]